diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml index 5b822db6c..bb8eb6070 100644 --- a/.github/workflows/tests.yml +++ b/.github/workflows/tests.yml @@ -39,13 +39,13 @@ jobs: - name: Lint with ruff run: pre-commit run ruff - name: Lint with isort - run: pre-commit run isort + run: pre-commit run isort --show-diff-on-failure - name: Lint with black - run: pre-commit run black + run: pre-commit run black --show-diff-on-failure - name: Lint with flake8 - run: pre-commit run flake8 + run: pre-commit run flake8 --hook-stage manual - name: Check types with mypy - run: pre-commit run mypy + run: pre-commit run mypy --hook-stage manual rule_linter: runs-on: ubuntu-20.04 @@ -95,6 +95,10 @@ jobs: run: sudo apt-get install -y libyaml-dev - name: Install capa run: pip install -e .[dev] + - name: Run tests (fast) + # this set of tests runs about 80% of the cases in 20% of the time, + # and should catch most errors quickly. + run: pre-commit run pytest-fast --all-files --hook-stage manual - name: Run tests run: pytest -v tests/ @@ -103,7 +107,7 @@ jobs: env: BN_SERIAL: ${{ secrets.BN_SERIAL }} runs-on: ubuntu-20.04 - needs: [code_style, rule_linter] + needs: [tests] strategy: fail-fast: false matrix: @@ -143,7 +147,7 @@ jobs: ghidra-tests: name: Ghidra tests for ${{ matrix.python-version }} runs-on: ubuntu-20.04 - needs: [code_style, rule_linter] + needs: [tests] strategy: fail-fast: false matrix: @@ -197,4 +201,4 @@ jobs: cat ../output.log exit_code=$(cat ../output.log | grep exit | awk '{print $NF}') exit $exit_code - + \ No newline at end of file diff --git a/.gitmodules b/.gitmodules index 079d13dc0..d0181fba0 100644 --- a/.gitmodules +++ b/.gitmodules @@ -1,6 +1,8 @@ [submodule "rules"] path = rules url = ../capa-rules.git + branch = dynamic-syntax [submodule "tests/data"] path = tests/data url = ../capa-testfiles.git + branch = dynamic-feature-extractor diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml index dbc6e80f9..171293854 100644 --- a/.pre-commit-config.yaml +++ b/.pre-commit-config.yaml @@ -25,7 +25,7 @@ repos: hooks: - id: isort name: isort - stages: [commit, push] + stages: [commit, push, manual] language: system entry: isort args: @@ -45,7 +45,7 @@ repos: hooks: - id: black name: black - stages: [commit, push] + stages: [commit, push, manual] language: system entry: black args: @@ -62,7 +62,7 @@ repos: hooks: - id: ruff name: ruff - stages: [commit, push] + stages: [commit, push, manual] language: system entry: ruff args: @@ -79,7 +79,7 @@ repos: hooks: - id: flake8 name: flake8 - stages: [commit, push] + stages: [push, manual] language: system entry: flake8 args: @@ -97,7 +97,7 @@ repos: hooks: - id: mypy name: mypy - stages: [commit, push] + stages: [push, manual] language: system entry: mypy args: @@ -109,3 +109,21 @@ repos: - "tests/" always_run: true pass_filenames: false + +- repo: local + hooks: + - id: pytest-fast + name: pytest (fast) + stages: [manual] + language: system + entry: pytest + args: + - "tests/" + - "--ignore=tests/test_binja_features.py" + - "--ignore=tests/test_ghidra_features.py" + - "--ignore=tests/test_ida_features.py" + - "--ignore=tests/test_viv_features.py" + - "--ignore=tests/test_main.py" + - "--ignore=tests/test_scripts.py" + always_run: true + pass_filenames: false diff --git a/CHANGELOG.md b/CHANGELOG.md index 9ba46c452..3f6d1776b 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -3,14 +3,25 @@ ## master (unreleased) ### New Features -- ghidra: add Ghidra feature extractor and supporting code #1770 @colton-gabertan -- ghidra: add entry script helping users run capa against a loaded Ghidra database #1767 @mike-hunhoff +- add Ghidra backend #1770 #1767 @colton-gabertan @mike-hunhoff +- add dynamic analysis via CAPE sandbox reports #48 #1535 @yelhamer + - add call scope #771 @yelhamer + - add thread scope #1517 @yelhamer + - add process scope #1517 @yelhamer + - rules: change `meta.scope` to `meta.scopes` @yelhamer + - protobuf: add `Metadata.flavor` @williballenthin - binja: add support for forwarded exports #1646 @xusheng6 - binja: add support for symtab names #1504 @xusheng6 - add com class/interface features #322 @Aayush-goel-04 ### Breaking Changes +- remove the `SCOPE_*` constants in favor of the `Scope` enum #1764 @williballenthin +- protobuf: deprecate `RuleMetadata.scope` in favor of `RuleMetadata.scopes` @williballenthin +- protobuf: deprecate `Metadata.analysis` in favor of `Metadata.analysis2` that is dynamic analysis aware @williballenthin +- update freeze format to v3, adding support for dynamic analysis @williballenthin +- extractor: ignore DLL name for api features #1815 @mr-tz + ### New Rules (34) - nursery/get-ntoskrnl-base-address @mr-tz @@ -49,9 +60,9 @@ - ### Bug Fixes -- ghidra: fix ints_to_bytes performance #1761 @mike-hunhoff +- ghidra: fix `ints_to_bytes` performance #1761 @mike-hunhoff - binja: improve function call site detection @xusheng6 -- binja: use binaryninja.load to open files @xusheng6 +- binja: use `binaryninja.load` to open files @xusheng6 - binja: bump binja version to 3.5 #1789 @xusheng6 ### capa explorer IDA Pro plugin diff --git a/README.md b/README.md index a1d8d243a..bf9885579 100644 --- a/README.md +++ b/README.md @@ -8,7 +8,7 @@ [![License](https://img.shields.io/badge/license-Apache--2.0-green.svg)](LICENSE.txt) capa detects capabilities in executable files. -You run it against a PE, ELF, .NET module, or shellcode file and it tells you what it thinks the program can do. +You run it against a PE, ELF, .NET module, shellcode file, or a sandbox report and it tells you what it thinks the program can do. For example, it might suggest that the file is a backdoor, is capable of installing services, or relies on HTTP to communicate. Check out: @@ -125,6 +125,96 @@ function @ 0x4011C0 ... ``` +Additionally, capa also supports analyzing [CAPE](https://github.com/kevoreilly/CAPEv2) sandbox reports for dynamic capabilty extraction. +In order to use this, you first submit your sample to CAPE for analysis, and then run capa against the generated report (JSON). + +Here's an example of running capa against a packed binary, and then running capa against the CAPE report of that binary: + +```yaml +$ capa 05be49819139a3fdcdbddbdefd298398779521f3d68daa25275cc77508e42310.exe +WARNING:capa.capabilities.common:-------------------------------------------------------------------------------- +WARNING:capa.capabilities.common: This sample appears to be packed. +WARNING:capa.capabilities.common: +WARNING:capa.capabilities.common: Packed samples have often been obfuscated to hide their logic. +WARNING:capa.capabilities.common: capa cannot handle obfuscation well using static analysis. This means the results may be misleading or incomplete. +WARNING:capa.capabilities.common: If possible, you should try to unpack this input file before analyzing it with capa. +WARNING:capa.capabilities.common: Alternatively, run the sample in a supported sandbox and invoke capa against the report to obtain dynamic analysis results. +WARNING:capa.capabilities.common: +WARNING:capa.capabilities.common: Identified via rule: (internal) packer file limitation +WARNING:capa.capabilities.common: +WARNING:capa.capabilities.common: Use -v or -vv if you really want to see the capabilities identified by capa. +WARNING:capa.capabilities.common:-------------------------------------------------------------------------------- + +$ capa 05be49819139a3fdcdbddbdefd298398779521f3d68daa25275cc77508e42310.json + +┍━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┑ +│ ATT&CK Tactic │ ATT&CK Technique │ +┝━━━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┥ +│ CREDENTIAL ACCESS │ Credentials from Password Stores T1555 │ +├────────────────────────┼────────────────────────────────────────────────────────────────────────────────────┤ +│ DEFENSE EVASION │ File and Directory Permissions Modification T1222 │ +│ │ Modify Registry T1112 │ +│ │ Obfuscated Files or Information T1027 │ +│ │ Virtualization/Sandbox Evasion::User Activity Based Checks T1497.002 │ +├────────────────────────┼────────────────────────────────────────────────────────────────────────────────────┤ +│ DISCOVERY │ Account Discovery T1087 │ +│ │ Application Window Discovery T1010 │ +│ │ File and Directory Discovery T1083 │ +│ │ Query Registry T1012 │ +│ │ System Information Discovery T1082 │ +│ │ System Location Discovery::System Language Discovery T1614.001 │ +│ │ System Owner/User Discovery T1033 │ +├────────────────────────┼────────────────────────────────────────────────────────────────────────────────────┤ +│ EXECUTION │ System Services::Service Execution T1569.002 │ +├────────────────────────┼────────────────────────────────────────────────────────────────────────────────────┤ +│ PERSISTENCE │ Boot or Logon Autostart Execution::Registry Run Keys / Startup Folder T1547.001 │ +│ │ Boot or Logon Autostart Execution::Winlogon Helper DLL T1547.004 │ +│ │ Create or Modify System Process::Windows Service T1543.003 │ +┕━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┙ + +┍━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┑ +│ Capability │ Namespace │ +┝━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┥ +│ check for unmoving mouse cursor (3 matches) │ anti-analysis/anti-vm/vm-detection │ +│ gather bitkinex information │ collection/file-managers │ +│ gather classicftp information │ collection/file-managers │ +│ gather filezilla information │ collection/file-managers │ +│ gather total-commander information │ collection/file-managers │ +│ gather ultrafxp information │ collection/file-managers │ +│ resolve DNS (23 matches) │ communication/dns │ +│ initialize Winsock library (7 matches) │ communication/socket │ +│ act as TCP client (3 matches) │ communication/tcp/client │ +│ create new key via CryptAcquireContext │ data-manipulation/encryption │ +│ encrypt or decrypt via WinCrypt │ data-manipulation/encryption │ +│ hash data via WinCrypt │ data-manipulation/hashing │ +│ initialize hashing via WinCrypt │ data-manipulation/hashing │ +│ hash data with MD5 │ data-manipulation/hashing/md5 │ +│ generate random numbers via WinAPI │ data-manipulation/prng │ +│ extract resource via kernel32 functions (2 matches) │ executable/resource │ +│ interact with driver via control codes (2 matches) │ host-interaction/driver │ +│ get Program Files directory (18 matches) │ host-interaction/file-system │ +│ get common file path (575 matches) │ host-interaction/file-system │ +│ create directory (2 matches) │ host-interaction/file-system/create │ +│ delete file │ host-interaction/file-system/delete │ +│ get file attributes (122 matches) │ host-interaction/file-system/meta │ +│ set file attributes (8 matches) │ host-interaction/file-system/meta │ +│ move file │ host-interaction/file-system/move │ +│ find taskbar (3 matches) │ host-interaction/gui/taskbar/find │ +│ get keyboard layout (12 matches) │ host-interaction/hardware/keyboard │ +│ get disk size │ host-interaction/hardware/storage │ +│ get hostname (4 matches) │ host-interaction/os/hostname │ +│ allocate or change RWX memory (3 matches) │ host-interaction/process/inject │ +│ query or enumerate registry key (3 matches) │ host-interaction/registry │ +│ query or enumerate registry value (8 matches) │ host-interaction/registry │ +│ delete registry key │ host-interaction/registry/delete │ +│ start service │ host-interaction/service/start │ +│ get session user name │ host-interaction/session │ +│ persist via Run registry key │ persistence/registry/run │ +│ persist via Winlogon Helper DLL registry key │ persistence/registry/winlogon-helper │ +│ persist via Windows service (2 matches) │ persistence/service │ +┕━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┙ +``` + capa uses a collection of rules to identify capabilities within a program. These rules are easy to write, even for those new to reverse engineering. By authoring rules, you can extend the capabilities that capa recognizes. @@ -135,31 +225,30 @@ Here's an example rule used by capa: ```yaml rule: meta: - name: hash data with CRC32 - namespace: data-manipulation/checksum/crc32 + name: create TCP socket + namespace: communication/socket/tcp authors: - - moritz.raabe@mandiant.com - scope: function + - william.ballenthin@mandiant.com + - joakim@intezer.com + - anushka.virgaonkar@mandiant.com + scopes: + static: basic block + dynamic: call mbc: - - Data::Checksum::CRC32 [C0032.001] + - Communication::Socket Communication::Create TCP Socket [C0001.011] examples: - - 2D3EDC218A90F03089CC01715A9F047F:0x403CBD - - 7D28CB106CB54876B2A5C111724A07CD:0x402350 # RtlComputeCrc32 - - 7EFF498DE13CC734262F87E6B3EF38AB:0x100084A6 + - Practical Malware Analysis Lab 01-01.dll_:0x10001010 features: - or: - and: - - mnemonic: shr + - number: 6 = IPPROTO_TCP + - number: 1 = SOCK_STREAM + - number: 2 = AF_INET - or: - - number: 0xEDB88320 - - bytes: 00 00 00 00 96 30 07 77 2C 61 0E EE BA 51 09 99 19 C4 6D 07 8F F4 6A 70 35 A5 63 E9 A3 95 64 9E = crc32_tab - - number: 8 - - characteristic: nzxor - - and: - - number: 0x8320 - - number: 0xEDB8 - - characteristic: nzxor - - api: RtlComputeCrc32 + - api: ws2_32.socket + - api: ws2_32.WSASocket + - api: socket + - property/read: System.Net.Sockets.TcpClient::Client ``` The [github.com/mandiant/capa-rules](https://github.com/mandiant/capa-rules) repository contains hundreds of standard library rules that are distributed with capa. diff --git a/capa/capabilities/__init__.py b/capa/capabilities/__init__.py new file mode 100644 index 000000000..e69de29bb diff --git a/capa/capabilities/common.py b/capa/capabilities/common.py new file mode 100644 index 000000000..a73f40afe --- /dev/null +++ b/capa/capabilities/common.py @@ -0,0 +1,79 @@ +# -*- coding: utf-8 -*- +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import logging +import itertools +import collections +from typing import Any, Tuple + +from capa.rules import Scope, RuleSet +from capa.engine import FeatureSet, MatchResults +from capa.features.address import NO_ADDRESS +from capa.features.extractors.base_extractor import FeatureExtractor, StaticFeatureExtractor, DynamicFeatureExtractor + +logger = logging.getLogger(__name__) + + +def find_file_capabilities(ruleset: RuleSet, extractor: FeatureExtractor, function_features: FeatureSet): + file_features: FeatureSet = collections.defaultdict(set) + + for feature, va in itertools.chain(extractor.extract_file_features(), extractor.extract_global_features()): + # not all file features may have virtual addresses. + # if not, then at least ensure the feature shows up in the index. + # the set of addresses will still be empty. + if va: + file_features[feature].add(va) + else: + if feature not in file_features: + file_features[feature] = set() + + logger.debug("analyzed file and extracted %d features", len(file_features)) + + file_features.update(function_features) + + _, matches = ruleset.match(Scope.FILE, file_features, NO_ADDRESS) + return matches, len(file_features) + + +def has_file_limitation(rules: RuleSet, capabilities: MatchResults, is_standalone=True) -> bool: + file_limitation_rules = list(filter(lambda r: r.is_file_limitation_rule(), rules.rules.values())) + + for file_limitation_rule in file_limitation_rules: + if file_limitation_rule.name not in capabilities: + continue + + logger.warning("-" * 80) + for line in file_limitation_rule.meta.get("description", "").split("\n"): + logger.warning(" %s", line) + logger.warning(" Identified via rule: %s", file_limitation_rule.name) + if is_standalone: + logger.warning(" ") + logger.warning(" Use -v or -vv if you really want to see the capabilities identified by capa.") + logger.warning("-" * 80) + + # bail on first file limitation + return True + + return False + + +def find_capabilities( + ruleset: RuleSet, extractor: FeatureExtractor, disable_progress=None, **kwargs +) -> Tuple[MatchResults, Any]: + from capa.capabilities.static import find_static_capabilities + from capa.capabilities.dynamic import find_dynamic_capabilities + + if isinstance(extractor, StaticFeatureExtractor): + # for the time being, extractors are either static or dynamic. + # Remove this assertion once that has changed + assert not isinstance(extractor, DynamicFeatureExtractor) + return find_static_capabilities(ruleset, extractor, disable_progress=disable_progress, **kwargs) + if isinstance(extractor, DynamicFeatureExtractor): + return find_dynamic_capabilities(ruleset, extractor, disable_progress=disable_progress, **kwargs) + + raise ValueError(f"unexpected extractor type: {extractor.__class__.__name__}") diff --git a/capa/capabilities/dynamic.py b/capa/capabilities/dynamic.py new file mode 100644 index 000000000..23bfde4ac --- /dev/null +++ b/capa/capabilities/dynamic.py @@ -0,0 +1,198 @@ +# -*- coding: utf-8 -*- +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import logging +import itertools +import collections +from typing import Any, Tuple + +import tqdm + +import capa.perf +import capa.features.freeze as frz +import capa.render.result_document as rdoc +from capa.rules import Scope, RuleSet +from capa.engine import FeatureSet, MatchResults +from capa.helpers import redirecting_print_to_tqdm +from capa.capabilities.common import find_file_capabilities +from capa.features.extractors.base_extractor import CallHandle, ThreadHandle, ProcessHandle, DynamicFeatureExtractor + +logger = logging.getLogger(__name__) + + +def find_call_capabilities( + ruleset: RuleSet, extractor: DynamicFeatureExtractor, ph: ProcessHandle, th: ThreadHandle, ch: CallHandle +) -> Tuple[FeatureSet, MatchResults]: + """ + find matches for the given rules for the given call. + + returns: tuple containing (features for call, match results for call) + """ + # all features found for the call. + features: FeatureSet = collections.defaultdict(set) + + for feature, addr in itertools.chain( + extractor.extract_call_features(ph, th, ch), extractor.extract_global_features() + ): + features[feature].add(addr) + + # matches found at this thread. + _, matches = ruleset.match(Scope.CALL, features, ch.address) + + for rule_name, res in matches.items(): + rule = ruleset[rule_name] + for addr, _ in res: + capa.engine.index_rule_matches(features, rule, [addr]) + + return features, matches + + +def find_thread_capabilities( + ruleset: RuleSet, extractor: DynamicFeatureExtractor, ph: ProcessHandle, th: ThreadHandle +) -> Tuple[FeatureSet, MatchResults, MatchResults]: + """ + find matches for the given rules within the given thread. + + returns: tuple containing (features for thread, match results for thread, match results for calls) + """ + # all features found within this thread, + # includes features found within calls. + features: FeatureSet = collections.defaultdict(set) + + # matches found at the call scope. + # might be found at different calls, thats ok. + call_matches: MatchResults = collections.defaultdict(list) + + for ch in extractor.get_calls(ph, th): + ifeatures, imatches = find_call_capabilities(ruleset, extractor, ph, th, ch) + for feature, vas in ifeatures.items(): + features[feature].update(vas) + + for rule_name, res in imatches.items(): + call_matches[rule_name].extend(res) + + for feature, va in itertools.chain(extractor.extract_thread_features(ph, th), extractor.extract_global_features()): + features[feature].add(va) + + # matches found within this thread. + _, matches = ruleset.match(Scope.THREAD, features, th.address) + + for rule_name, res in matches.items(): + rule = ruleset[rule_name] + for va, _ in res: + capa.engine.index_rule_matches(features, rule, [va]) + + return features, matches, call_matches + + +def find_process_capabilities( + ruleset: RuleSet, extractor: DynamicFeatureExtractor, ph: ProcessHandle +) -> Tuple[MatchResults, MatchResults, MatchResults, int]: + """ + find matches for the given rules within the given process. + + returns: tuple containing (match results for process, match results for threads, match results for calls, number of features) + """ + # all features found within this process, + # includes features found within threads (and calls). + process_features: FeatureSet = collections.defaultdict(set) + + # matches found at the basic threads. + # might be found at different threads, thats ok. + thread_matches: MatchResults = collections.defaultdict(list) + + # matches found at the call scope. + # might be found at different calls, thats ok. + call_matches: MatchResults = collections.defaultdict(list) + + for th in extractor.get_threads(ph): + features, tmatches, cmatches = find_thread_capabilities(ruleset, extractor, ph, th) + for feature, vas in features.items(): + process_features[feature].update(vas) + + for rule_name, res in tmatches.items(): + thread_matches[rule_name].extend(res) + + for rule_name, res in cmatches.items(): + call_matches[rule_name].extend(res) + + for feature, va in itertools.chain(extractor.extract_process_features(ph), extractor.extract_global_features()): + process_features[feature].add(va) + + _, process_matches = ruleset.match(Scope.PROCESS, process_features, ph.address) + return process_matches, thread_matches, call_matches, len(process_features) + + +def find_dynamic_capabilities( + ruleset: RuleSet, extractor: DynamicFeatureExtractor, disable_progress=None +) -> Tuple[MatchResults, Any]: + all_process_matches: MatchResults = collections.defaultdict(list) + all_thread_matches: MatchResults = collections.defaultdict(list) + all_call_matches: MatchResults = collections.defaultdict(list) + + feature_counts = rdoc.DynamicFeatureCounts(file=0, processes=()) + + assert isinstance(extractor, DynamicFeatureExtractor) + with redirecting_print_to_tqdm(disable_progress): + with tqdm.contrib.logging.logging_redirect_tqdm(): + pbar = tqdm.tqdm + if disable_progress: + # do not use tqdm to avoid unnecessary side effects when caller intends + # to disable progress completely + def pbar(s, *args, **kwargs): + return s + + processes = list(extractor.get_processes()) + + pb = pbar(processes, desc="matching", unit=" processes", leave=False) + for p in pb: + process_matches, thread_matches, call_matches, feature_count = find_process_capabilities( + ruleset, extractor, p + ) + feature_counts.processes += ( + rdoc.ProcessFeatureCount(address=frz.Address.from_capa(p.address), count=feature_count), + ) + logger.debug("analyzed %s and extracted %d features", p.address, feature_count) + + for rule_name, res in process_matches.items(): + all_process_matches[rule_name].extend(res) + for rule_name, res in thread_matches.items(): + all_thread_matches[rule_name].extend(res) + for rule_name, res in call_matches.items(): + all_call_matches[rule_name].extend(res) + + # collection of features that captures the rule matches within process and thread scopes. + # mapping from feature (matched rule) to set of addresses at which it matched. + process_and_lower_features: FeatureSet = collections.defaultdict(set) + for rule_name, results in itertools.chain( + all_process_matches.items(), all_thread_matches.items(), all_call_matches.items() + ): + locations = {p[0] for p in results} + rule = ruleset[rule_name] + capa.engine.index_rule_matches(process_and_lower_features, rule, locations) + + all_file_matches, feature_count = find_file_capabilities(ruleset, extractor, process_and_lower_features) + feature_counts.file = feature_count + + matches = dict( + itertools.chain( + # each rule exists in exactly one scope, + # so there won't be any overlap among these following MatchResults, + # and we can merge the dictionaries naively. + all_thread_matches.items(), + all_process_matches.items(), + all_call_matches.items(), + all_file_matches.items(), + ) + ) + + meta = { + "feature_counts": feature_counts, + } + + return matches, meta diff --git a/capa/capabilities/static.py b/capa/capabilities/static.py new file mode 100644 index 000000000..a522a29da --- /dev/null +++ b/capa/capabilities/static.py @@ -0,0 +1,233 @@ +# -*- coding: utf-8 -*- +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import time +import logging +import itertools +import collections +from typing import Any, Tuple + +import tqdm.contrib.logging + +import capa.perf +import capa.features.freeze as frz +import capa.render.result_document as rdoc +from capa.rules import Scope, RuleSet +from capa.engine import FeatureSet, MatchResults +from capa.helpers import redirecting_print_to_tqdm +from capa.capabilities.common import find_file_capabilities +from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, StaticFeatureExtractor + +logger = logging.getLogger(__name__) + + +def find_instruction_capabilities( + ruleset: RuleSet, extractor: StaticFeatureExtractor, f: FunctionHandle, bb: BBHandle, insn: InsnHandle +) -> Tuple[FeatureSet, MatchResults]: + """ + find matches for the given rules for the given instruction. + + returns: tuple containing (features for instruction, match results for instruction) + """ + # all features found for the instruction. + features: FeatureSet = collections.defaultdict(set) + + for feature, addr in itertools.chain( + extractor.extract_insn_features(f, bb, insn), extractor.extract_global_features() + ): + features[feature].add(addr) + + # matches found at this instruction. + _, matches = ruleset.match(Scope.INSTRUCTION, features, insn.address) + + for rule_name, res in matches.items(): + rule = ruleset[rule_name] + for addr, _ in res: + capa.engine.index_rule_matches(features, rule, [addr]) + + return features, matches + + +def find_basic_block_capabilities( + ruleset: RuleSet, extractor: StaticFeatureExtractor, f: FunctionHandle, bb: BBHandle +) -> Tuple[FeatureSet, MatchResults, MatchResults]: + """ + find matches for the given rules within the given basic block. + + returns: tuple containing (features for basic block, match results for basic block, match results for instructions) + """ + # all features found within this basic block, + # includes features found within instructions. + features: FeatureSet = collections.defaultdict(set) + + # matches found at the instruction scope. + # might be found at different instructions, thats ok. + insn_matches: MatchResults = collections.defaultdict(list) + + for insn in extractor.get_instructions(f, bb): + ifeatures, imatches = find_instruction_capabilities(ruleset, extractor, f, bb, insn) + for feature, vas in ifeatures.items(): + features[feature].update(vas) + + for rule_name, res in imatches.items(): + insn_matches[rule_name].extend(res) + + for feature, va in itertools.chain( + extractor.extract_basic_block_features(f, bb), extractor.extract_global_features() + ): + features[feature].add(va) + + # matches found within this basic block. + _, matches = ruleset.match(Scope.BASIC_BLOCK, features, bb.address) + + for rule_name, res in matches.items(): + rule = ruleset[rule_name] + for va, _ in res: + capa.engine.index_rule_matches(features, rule, [va]) + + return features, matches, insn_matches + + +def find_code_capabilities( + ruleset: RuleSet, extractor: StaticFeatureExtractor, fh: FunctionHandle +) -> Tuple[MatchResults, MatchResults, MatchResults, int]: + """ + find matches for the given rules within the given function. + + returns: tuple containing (match results for function, match results for basic blocks, match results for instructions, number of features) + """ + # all features found within this function, + # includes features found within basic blocks (and instructions). + function_features: FeatureSet = collections.defaultdict(set) + + # matches found at the basic block scope. + # might be found at different basic blocks, thats ok. + bb_matches: MatchResults = collections.defaultdict(list) + + # matches found at the instruction scope. + # might be found at different instructions, thats ok. + insn_matches: MatchResults = collections.defaultdict(list) + + for bb in extractor.get_basic_blocks(fh): + features, bmatches, imatches = find_basic_block_capabilities(ruleset, extractor, fh, bb) + for feature, vas in features.items(): + function_features[feature].update(vas) + + for rule_name, res in bmatches.items(): + bb_matches[rule_name].extend(res) + + for rule_name, res in imatches.items(): + insn_matches[rule_name].extend(res) + + for feature, va in itertools.chain(extractor.extract_function_features(fh), extractor.extract_global_features()): + function_features[feature].add(va) + + _, function_matches = ruleset.match(Scope.FUNCTION, function_features, fh.address) + return function_matches, bb_matches, insn_matches, len(function_features) + + +def find_static_capabilities( + ruleset: RuleSet, extractor: StaticFeatureExtractor, disable_progress=None +) -> Tuple[MatchResults, Any]: + all_function_matches: MatchResults = collections.defaultdict(list) + all_bb_matches: MatchResults = collections.defaultdict(list) + all_insn_matches: MatchResults = collections.defaultdict(list) + + feature_counts = rdoc.StaticFeatureCounts(file=0, functions=()) + library_functions: Tuple[rdoc.LibraryFunction, ...] = () + + assert isinstance(extractor, StaticFeatureExtractor) + with redirecting_print_to_tqdm(disable_progress): + with tqdm.contrib.logging.logging_redirect_tqdm(): + pbar = tqdm.tqdm + if capa.helpers.is_runtime_ghidra(): + # Ghidrathon interpreter cannot properly handle + # the TMonitor thread that is created via a monitor_interval + # > 0 + pbar.monitor_interval = 0 + if disable_progress: + # do not use tqdm to avoid unnecessary side effects when caller intends + # to disable progress completely + def pbar(s, *args, **kwargs): + return s + + functions = list(extractor.get_functions()) + n_funcs = len(functions) + + pb = pbar(functions, desc="matching", unit=" functions", postfix="skipped 0 library functions", leave=False) + for f in pb: + t0 = time.time() + if extractor.is_library_function(f.address): + function_name = extractor.get_function_name(f.address) + logger.debug("skipping library function 0x%x (%s)", f.address, function_name) + library_functions += ( + rdoc.LibraryFunction(address=frz.Address.from_capa(f.address), name=function_name), + ) + n_libs = len(library_functions) + percentage = round(100 * (n_libs / n_funcs)) + if isinstance(pb, tqdm.tqdm): + pb.set_postfix_str(f"skipped {n_libs} library functions ({percentage}%)") + continue + + function_matches, bb_matches, insn_matches, feature_count = find_code_capabilities( + ruleset, extractor, f + ) + feature_counts.functions += ( + rdoc.FunctionFeatureCount(address=frz.Address.from_capa(f.address), count=feature_count), + ) + t1 = time.time() + + match_count = sum(len(res) for res in function_matches.values()) + match_count += sum(len(res) for res in bb_matches.values()) + match_count += sum(len(res) for res in insn_matches.values()) + logger.debug( + "analyzed function 0x%x and extracted %d features, %d matches in %0.02fs", + f.address, + feature_count, + match_count, + t1 - t0, + ) + + for rule_name, res in function_matches.items(): + all_function_matches[rule_name].extend(res) + for rule_name, res in bb_matches.items(): + all_bb_matches[rule_name].extend(res) + for rule_name, res in insn_matches.items(): + all_insn_matches[rule_name].extend(res) + + # collection of features that captures the rule matches within function, BB, and instruction scopes. + # mapping from feature (matched rule) to set of addresses at which it matched. + function_and_lower_features: FeatureSet = collections.defaultdict(set) + for rule_name, results in itertools.chain( + all_function_matches.items(), all_bb_matches.items(), all_insn_matches.items() + ): + locations = {p[0] for p in results} + rule = ruleset[rule_name] + capa.engine.index_rule_matches(function_and_lower_features, rule, locations) + + all_file_matches, feature_count = find_file_capabilities(ruleset, extractor, function_and_lower_features) + feature_counts.file = feature_count + + matches = dict( + itertools.chain( + # each rule exists in exactly one scope, + # so there won't be any overlap among these following MatchResults, + # and we can merge the dictionaries naively. + all_insn_matches.items(), + all_bb_matches.items(), + all_function_matches.items(), + all_file_matches.items(), + ) + ) + + meta = { + "feature_counts": feature_counts, + "library_functions": library_functions, + } + + return matches, meta diff --git a/capa/engine.py b/capa/engine.py index 8ae36d3ea..7e6d66f29 100644 --- a/capa/engine.py +++ b/capa/engine.py @@ -304,7 +304,7 @@ def match(rules: List["capa.rules.Rule"], features: FeatureSet, addr: Address) - other strategies can be imagined that match differently; implement these elsewhere. specifically, this routine does "top down" matching of the given rules against the feature set. """ - results = collections.defaultdict(list) # type: MatchResults + results: MatchResults = collections.defaultdict(list) # copy features so that we can modify it # without affecting the caller (keep this function pure) diff --git a/capa/exceptions.py b/capa/exceptions.py index e080791ae..58af3bef3 100644 --- a/capa/exceptions.py +++ b/capa/exceptions.py @@ -19,3 +19,7 @@ class UnsupportedArchError(ValueError): class UnsupportedOSError(ValueError): pass + + +class EmptyReportError(ValueError): + pass diff --git a/capa/features/address.py b/capa/features/address.py index 428284957..800cefcd3 100644 --- a/capa/features/address.py +++ b/capa/features/address.py @@ -43,6 +43,79 @@ def __hash__(self): return int.__hash__(self) +class ProcessAddress(Address): + """an address of a process in a dynamic execution trace""" + + def __init__(self, pid: int, ppid: int = 0): + assert ppid >= 0 + assert pid > 0 + self.ppid = ppid + self.pid = pid + + def __repr__(self): + return "process(%s%s)" % ( + f"ppid: {self.ppid}, " if self.ppid > 0 else "", + f"pid: {self.pid}", + ) + + def __hash__(self): + return hash((self.ppid, self.pid)) + + def __eq__(self, other): + assert isinstance(other, ProcessAddress) + return (self.ppid, self.pid) == (other.ppid, other.pid) + + def __lt__(self, other): + assert isinstance(other, ProcessAddress) + return (self.ppid, self.pid) < (other.ppid, other.pid) + + +class ThreadAddress(Address): + """addresses a thread in a dynamic execution trace""" + + def __init__(self, process: ProcessAddress, tid: int): + assert tid >= 0 + self.process = process + self.tid = tid + + def __repr__(self): + return f"{self.process}, thread(tid: {self.tid})" + + def __hash__(self): + return hash((self.process, self.tid)) + + def __eq__(self, other): + assert isinstance(other, ThreadAddress) + return (self.process, self.tid) == (other.process, other.tid) + + def __lt__(self, other): + assert isinstance(other, ThreadAddress) + return (self.process, self.tid) < (other.process, other.tid) + + +class DynamicCallAddress(Address): + """addesses a call in a dynamic execution trace""" + + def __init__(self, thread: ThreadAddress, id: int): + assert id >= 0 + self.thread = thread + self.id = id + + def __repr__(self): + return f"{self.thread}, call(id: {self.id})" + + def __hash__(self): + return hash((self.thread, self.id)) + + def __eq__(self, other): + assert isinstance(other, DynamicCallAddress) + return (self.thread, self.id) == (other.thread, other.id) + + def __lt__(self, other): + assert isinstance(other, DynamicCallAddress) + return (self.thread, self.id) < (other.thread, other.id) + + class RelativeVirtualAddress(int, Address): """a memory address relative to a base address""" diff --git a/capa/features/common.py b/capa/features/common.py index 9278f7e8f..0cb1396de 100644 --- a/capa/features/common.py +++ b/capa/features/common.py @@ -457,6 +457,17 @@ def evaluate(self, ctx, **kwargs): FORMAT_AUTO = "auto" FORMAT_SC32 = "sc32" FORMAT_SC64 = "sc64" +FORMAT_CAPE = "cape" +STATIC_FORMATS = { + FORMAT_SC32, + FORMAT_SC64, + FORMAT_PE, + FORMAT_ELF, + FORMAT_DOTNET, +} +DYNAMIC_FORMATS = { + FORMAT_CAPE, +} FORMAT_FREEZE = "freeze" FORMAT_RESULT = "result" FORMAT_UNKNOWN = "unknown" diff --git a/capa/features/extractors/base_extractor.py b/capa/features/extractors/base_extractor.py index 09776df25..6252d7470 100644 --- a/capa/features/extractors/base_extractor.py +++ b/capa/features/extractors/base_extractor.py @@ -7,13 +7,18 @@ # See the License for the specific language governing permissions and limitations under the License. import abc +import hashlib import dataclasses from typing import Any, Dict, Tuple, Union, Iterator from dataclasses import dataclass +# TODO(williballenthin): use typing.TypeAlias directly when Python 3.9 is deprecated +# https://github.com/mandiant/capa/issues/1699 +from typing_extensions import TypeAlias + import capa.features.address from capa.features.common import Feature -from capa.features.address import Address, AbsoluteVirtualAddress +from capa.features.address import Address, ThreadAddress, ProcessAddress, DynamicCallAddress, AbsoluteVirtualAddress # feature extractors may reference functions, BBs, insns by opaque handle values. # you can use the `.address` property to get and render the address of the feature. @@ -22,6 +27,24 @@ # the feature extractor from which they were created. +@dataclass +class SampleHashes: + md5: str + sha1: str + sha256: str + + @classmethod + def from_bytes(cls, buf: bytes) -> "SampleHashes": + md5 = hashlib.md5() + sha1 = hashlib.sha1() + sha256 = hashlib.sha256() + md5.update(buf) + sha1.update(buf) + sha256.update(buf) + + return cls(md5=md5.hexdigest(), sha1=sha1.hexdigest(), sha256=sha256.hexdigest()) + + @dataclass class FunctionHandle: """reference to a function recognized by a feature extractor. @@ -63,16 +86,18 @@ class InsnHandle: inner: Any -class FeatureExtractor: +class StaticFeatureExtractor: """ - FeatureExtractor defines the interface for fetching features from a sample. + StaticFeatureExtractor defines the interface for fetching features from a + sample without running it; extractors that rely on the execution trace of + a sample must implement the other sibling class, DynamicFeatureExtracor. There may be multiple backends that support fetching features for capa. For example, we use vivisect by default, but also want to support saving and restoring features from a JSON file. When we restore the features, we'd like to use exactly the same matching logic to find matching rules. - Therefore, we can define a FeatureExtractor that provides features from the + Therefore, we can define a StaticFeatureExtractor that provides features from the serialized JSON file and do matching without a binary analysis pass. Also, this provides a way to hook in an IDA backend. @@ -81,13 +106,14 @@ class FeatureExtractor: __metaclass__ = abc.ABCMeta - def __init__(self): + def __init__(self, hashes: SampleHashes): # # note: a subclass should define ctor parameters for its own use. # for example, the Vivisect feature extract might require the vw and/or path. # this base class doesn't know what to do with that info, though. # super().__init__() + self._sample_hashes = hashes @abc.abstractmethod def get_base_address(self) -> Union[AbsoluteVirtualAddress, capa.features.address._NoAddress]: @@ -100,6 +126,12 @@ def get_base_address(self) -> Union[AbsoluteVirtualAddress, capa.features.addres """ raise NotImplementedError() + def get_sample_hashes(self) -> SampleHashes: + """ + fetch the hashes for the sample contained within the extractor. + """ + return self._sample_hashes + @abc.abstractmethod def extract_global_features(self) -> Iterator[Tuple[Feature, Address]]: """ @@ -262,3 +294,177 @@ def extract_insn_features( Tuple[Feature, Address]: feature and its location """ raise NotImplementedError() + + +@dataclass +class ProcessHandle: + """ + reference to a process extracted by the sandbox. + + Attributes: + address: process's address (pid) + inner: sandbox-specific data + """ + + address: ProcessAddress + inner: Any + + +@dataclass +class ThreadHandle: + """ + reference to a thread extracted by the sandbox. + + Attributes: + address: thread's address (tid) + inner: sandbox-specific data + """ + + address: ThreadAddress + inner: Any + + +@dataclass +class CallHandle: + """ + reference to an api call extracted by the sandbox. + + Attributes: + address: call's address, such as event index or id + inner: sandbox-specific data + """ + + address: DynamicCallAddress + inner: Any + + +class DynamicFeatureExtractor: + """ + DynamicFeatureExtractor defines the interface for fetching features from a + sandbox' analysis of a sample; extractors that rely on statically analyzing + a sample must implement the sibling extractor, StaticFeatureExtractor. + + Features are grouped mainly into threads that alongside their meta-features are also grouped into + processes (that also have their own features). Other scopes (such as function and file) may also apply + for a specific sandbox. + + This class is not instantiated directly; it is the base class for other implementations. + """ + + __metaclass__ = abc.ABCMeta + + def __init__(self, hashes: SampleHashes): + # + # note: a subclass should define ctor parameters for its own use. + # for example, the Vivisect feature extract might require the vw and/or path. + # this base class doesn't know what to do with that info, though. + # + super().__init__() + self._sample_hashes = hashes + + def get_sample_hashes(self) -> SampleHashes: + """ + fetch the hashes for the sample contained within the extractor. + """ + return self._sample_hashes + + @abc.abstractmethod + def extract_global_features(self) -> Iterator[Tuple[Feature, Address]]: + """ + extract features found at every scope ("global"). + + example:: + + extractor = CapeFeatureExtractor.from_report(json.loads(buf)) + for feature, addr in extractor.get_global_features(): + print(addr, feature) + + yields: + Tuple[Feature, Address]: feature and its location + """ + raise NotImplementedError() + + @abc.abstractmethod + def extract_file_features(self) -> Iterator[Tuple[Feature, Address]]: + """ + extract file-scope features. + + example:: + + extractor = CapeFeatureExtractor.from_report(json.loads(buf)) + for feature, addr in extractor.get_file_features(): + print(addr, feature) + + yields: + Tuple[Feature, Address]: feature and its location + """ + raise NotImplementedError() + + @abc.abstractmethod + def get_processes(self) -> Iterator[ProcessHandle]: + """ + Enumerate processes in the trace. + """ + raise NotImplementedError() + + @abc.abstractmethod + def extract_process_features(self, ph: ProcessHandle) -> Iterator[Tuple[Feature, Address]]: + """ + Yields all the features of a process. These include: + - file features of the process' image + """ + raise NotImplementedError() + + @abc.abstractmethod + def get_process_name(self, ph: ProcessHandle) -> str: + """ + Returns the human-readable name for the given process, + such as the filename. + """ + raise NotImplementedError() + + @abc.abstractmethod + def get_threads(self, ph: ProcessHandle) -> Iterator[ThreadHandle]: + """ + Enumerate threads in the given process. + """ + raise NotImplementedError() + + @abc.abstractmethod + def extract_thread_features(self, ph: ProcessHandle, th: ThreadHandle) -> Iterator[Tuple[Feature, Address]]: + """ + Yields all the features of a thread. These include: + - sequenced api traces + """ + raise NotImplementedError() + + @abc.abstractmethod + def get_calls(self, ph: ProcessHandle, th: ThreadHandle) -> Iterator[CallHandle]: + """ + Enumerate calls in the given thread + """ + raise NotImplementedError() + + @abc.abstractmethod + def extract_call_features( + self, ph: ProcessHandle, th: ThreadHandle, ch: CallHandle + ) -> Iterator[Tuple[Feature, Address]]: + """ + Yields all features of a call. These include: + - api name + - bytes/strings/numbers extracted from arguments + """ + raise NotImplementedError() + + @abc.abstractmethod + def get_call_name(self, ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -> str: + """ + Returns the human-readable name for the given call, + such as as rendered API log entry, like: + + Foo(1, "two", b"\x00\x11") -> -1 + """ + raise NotImplementedError() + + +FeatureExtractor: TypeAlias = Union[StaticFeatureExtractor, DynamicFeatureExtractor] diff --git a/capa/features/extractors/binja/extractor.py b/capa/features/extractors/binja/extractor.py index 167a8e6e0..e8d42908d 100644 --- a/capa/features/extractors/binja/extractor.py +++ b/capa/features/extractors/binja/extractor.py @@ -17,12 +17,18 @@ import capa.features.extractors.binja.basicblock from capa.features.common import Feature from capa.features.address import Address, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.extractors.base_extractor import ( + BBHandle, + InsnHandle, + SampleHashes, + FunctionHandle, + StaticFeatureExtractor, +) -class BinjaFeatureExtractor(FeatureExtractor): +class BinjaFeatureExtractor(StaticFeatureExtractor): def __init__(self, bv: binja.BinaryView): - super().__init__() + super().__init__(hashes=SampleHashes.from_bytes(bv.file.raw.read(0, len(bv.file.raw)))) self.bv = bv self.global_features: List[Tuple[Feature, Address]] = [] self.global_features.extend(capa.features.extractors.binja.file.extract_file_format(self.bv)) diff --git a/capa/features/extractors/binja/file.py b/capa/features/extractors/binja/file.py index 84b25348b..0054e62b1 100644 --- a/capa/features/extractors/binja/file.py +++ b/capa/features/extractors/binja/file.py @@ -115,13 +115,13 @@ def extract_file_import_names(bv: BinaryView) -> Iterator[Tuple[Feature, Address for sym in bv.get_symbols_of_type(SymbolType.ImportAddressSymbol): lib_name = str(sym.namespace) addr = AbsoluteVirtualAddress(sym.address) - for name in capa.features.extractors.helpers.generate_symbols(lib_name, sym.short_name): + for name in capa.features.extractors.helpers.generate_symbols(lib_name, sym.short_name, include_dll=True): yield Import(name), addr ordinal = sym.ordinal if ordinal != 0 and (lib_name != ""): ordinal_name = f"#{ordinal}" - for name in capa.features.extractors.helpers.generate_symbols(lib_name, ordinal_name): + for name in capa.features.extractors.helpers.generate_symbols(lib_name, ordinal_name, include_dll=True): yield Import(name), addr diff --git a/capa/features/extractors/cape/__init__.py b/capa/features/extractors/cape/__init__.py new file mode 100644 index 000000000..e69de29bb diff --git a/capa/features/extractors/cape/call.py b/capa/features/extractors/cape/call.py new file mode 100644 index 000000000..88680b3fa --- /dev/null +++ b/capa/features/extractors/cape/call.py @@ -0,0 +1,62 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging +from typing import Tuple, Iterator + +from capa.helpers import assert_never +from capa.features.insn import API, Number +from capa.features.common import String, Feature +from capa.features.address import Address +from capa.features.extractors.cape.models import Call +from capa.features.extractors.base_extractor import CallHandle, ThreadHandle, ProcessHandle + +logger = logging.getLogger(__name__) + + +def extract_call_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -> Iterator[Tuple[Feature, Address]]: + """ + this method extracts the given call's features (such as API name and arguments), + and returns them as API, Number, and String features. + + args: + ph: process handle (for defining the extraction scope) + th: thread handle (for defining the extraction scope) + ch: call handle (for defining the extraction scope) + + yields: + Feature, address; where Feature is either: API, Number, or String. + """ + call: Call = ch.inner + + # list similar to disassembly: arguments right-to-left, call + for arg in reversed(call.arguments): + value = arg.value + if isinstance(value, list) and len(value) == 0: + # unsure why CAPE captures arguments as empty lists? + continue + + elif isinstance(value, str): + yield String(value), ch.address + + elif isinstance(value, int): + yield Number(value), ch.address + + else: + assert_never(value) + + yield API(call.api), ch.address + + +def extract_features(ph: ProcessHandle, th: ThreadHandle, ch: CallHandle) -> Iterator[Tuple[Feature, Address]]: + for handler in CALL_HANDLERS: + for feature, addr in handler(ph, th, ch): + yield feature, addr + + +CALL_HANDLERS = (extract_call_features,) diff --git a/capa/features/extractors/cape/extractor.py b/capa/features/extractors/cape/extractor.py new file mode 100644 index 000000000..01a0d8d3a --- /dev/null +++ b/capa/features/extractors/cape/extractor.py @@ -0,0 +1,145 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging +from typing import Dict, Tuple, Union, Iterator + +import capa.features.extractors.cape.call +import capa.features.extractors.cape.file +import capa.features.extractors.cape.thread +import capa.features.extractors.cape.global_ +import capa.features.extractors.cape.process +from capa.exceptions import EmptyReportError, UnsupportedFormatError +from capa.features.common import Feature, Characteristic +from capa.features.address import NO_ADDRESS, Address, AbsoluteVirtualAddress, _NoAddress +from capa.features.extractors.cape.models import Call, Static, Process, CapeReport +from capa.features.extractors.base_extractor import ( + CallHandle, + SampleHashes, + ThreadHandle, + ProcessHandle, + DynamicFeatureExtractor, +) + +logger = logging.getLogger(__name__) + +TESTED_VERSIONS = {"2.2-CAPE", "2.4-CAPE"} + + +class CapeExtractor(DynamicFeatureExtractor): + def __init__(self, report: CapeReport): + super().__init__( + hashes=SampleHashes( + md5=report.target.file.md5.lower(), + sha1=report.target.file.sha1.lower(), + sha256=report.target.file.sha256.lower(), + ) + ) + self.report: CapeReport = report + + # pre-compute these because we'll yield them at *every* scope. + self.global_features = list(capa.features.extractors.cape.global_.extract_features(self.report)) + + def get_base_address(self) -> Union[AbsoluteVirtualAddress, _NoAddress, None]: + # value according to the PE header, the actual trace may use a different imagebase + assert self.report.static is not None and self.report.static.pe is not None + return AbsoluteVirtualAddress(self.report.static.pe.imagebase) + + def extract_global_features(self) -> Iterator[Tuple[Feature, Address]]: + yield from self.global_features + + def extract_file_features(self) -> Iterator[Tuple[Feature, Address]]: + yield from capa.features.extractors.cape.file.extract_features(self.report) + + def get_processes(self) -> Iterator[ProcessHandle]: + yield from capa.features.extractors.cape.file.get_processes(self.report) + + def extract_process_features(self, ph: ProcessHandle) -> Iterator[Tuple[Feature, Address]]: + yield from capa.features.extractors.cape.process.extract_features(ph) + + def get_process_name(self, ph) -> str: + process: Process = ph.inner + return process.process_name + + def get_threads(self, ph: ProcessHandle) -> Iterator[ThreadHandle]: + yield from capa.features.extractors.cape.process.get_threads(ph) + + def extract_thread_features(self, ph: ProcessHandle, th: ThreadHandle) -> Iterator[Tuple[Feature, Address]]: + if False: + # force this routine to be a generator, + # but we don't actually have any elements to generate. + yield Characteristic("never"), NO_ADDRESS + return + + def get_calls(self, ph: ProcessHandle, th: ThreadHandle) -> Iterator[CallHandle]: + yield from capa.features.extractors.cape.thread.get_calls(ph, th) + + def extract_call_features( + self, ph: ProcessHandle, th: ThreadHandle, ch: CallHandle + ) -> Iterator[Tuple[Feature, Address]]: + yield from capa.features.extractors.cape.call.extract_features(ph, th, ch) + + def get_call_name(self, ph, th, ch) -> str: + call: Call = ch.inner + + parts = [] + parts.append(call.api) + parts.append("(") + for argument in call.arguments: + parts.append(argument.name) + parts.append("=") + + if argument.pretty_value: + parts.append(argument.pretty_value) + else: + if isinstance(argument.value, int): + parts.append(hex(argument.value)) + elif isinstance(argument.value, str): + parts.append('"') + parts.append(argument.value) + parts.append('"') + elif isinstance(argument.value, list): + pass + else: + capa.helpers.assert_never(argument.value) + + parts.append(", ") + if call.arguments: + # remove the trailing comma + parts.pop() + parts.append(")") + parts.append(" -> ") + if call.pretty_return: + parts.append(call.pretty_return) + else: + parts.append(hex(call.return_)) + + return "".join(parts) + + @classmethod + def from_report(cls, report: Dict) -> "CapeExtractor": + cr = CapeReport.model_validate(report) + + if cr.info.version not in TESTED_VERSIONS: + logger.warning("CAPE version '%s' not tested/supported yet", cr.info.version) + + # observed in 2.4-CAPE reports from capesandbox.com + if cr.static is None and cr.target.file.pe is not None: + cr.static = Static() + cr.static.pe = cr.target.file.pe + + if cr.static is None: + raise UnsupportedFormatError("CAPE report missing static analysis") + + if cr.static.pe is None: + raise UnsupportedFormatError("CAPE report missing PE analysis") + + if len(cr.behavior.processes) == 0: + raise EmptyReportError("CAPE did not capture any processes") + + return cls(cr) diff --git a/capa/features/extractors/cape/file.py b/capa/features/extractors/cape/file.py new file mode 100644 index 000000000..3143504c0 --- /dev/null +++ b/capa/features/extractors/cape/file.py @@ -0,0 +1,132 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging +from typing import Tuple, Iterator + +from capa.features.file import Export, Import, Section +from capa.features.common import String, Feature +from capa.features.address import NO_ADDRESS, Address, ProcessAddress, AbsoluteVirtualAddress +from capa.features.extractors.helpers import generate_symbols +from capa.features.extractors.cape.models import CapeReport +from capa.features.extractors.base_extractor import ProcessHandle + +logger = logging.getLogger(__name__) + + +def get_processes(report: CapeReport) -> Iterator[ProcessHandle]: + """ + get all the created processes for a sample + """ + seen_processes = {} + for process in report.behavior.processes: + addr = ProcessAddress(pid=process.process_id, ppid=process.parent_id) + yield ProcessHandle(address=addr, inner=process) + + # check for pid and ppid reuse + if addr not in seen_processes: + seen_processes[addr] = [process] + else: + logger.warning( + "pid and ppid reuse detected between process %s and process%s: %s", + process, + "es" if len(seen_processes[addr]) > 1 else "", + seen_processes[addr], + ) + seen_processes[addr].append(process) + + +def extract_import_names(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + """ + extract imported function names + """ + assert report.static is not None and report.static.pe is not None + imports = report.static.pe.imports + + if isinstance(imports, dict): + imports = list(imports.values()) + + assert isinstance(imports, list) + + for library in imports: + for function in library.imports: + if not function.name: + continue + + for name in generate_symbols(library.dll, function.name, include_dll=True): + yield Import(name), AbsoluteVirtualAddress(function.address) + + +def extract_export_names(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + assert report.static is not None and report.static.pe is not None + for function in report.static.pe.exports: + yield Export(function.name), AbsoluteVirtualAddress(function.address) + + +def extract_section_names(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + assert report.static is not None and report.static.pe is not None + for section in report.static.pe.sections: + yield Section(section.name), AbsoluteVirtualAddress(section.virtual_address) + + +def extract_file_strings(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + if report.strings is not None: + for string in report.strings: + yield String(string), NO_ADDRESS + + +def extract_used_regkeys(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for regkey in report.behavior.summary.keys: + yield String(regkey), NO_ADDRESS + + +def extract_used_files(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for file in report.behavior.summary.files: + yield String(file), NO_ADDRESS + + +def extract_used_mutexes(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for mutex in report.behavior.summary.mutexes: + yield String(mutex), NO_ADDRESS + + +def extract_used_commands(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for cmd in report.behavior.summary.executed_commands: + yield String(cmd), NO_ADDRESS + + +def extract_used_apis(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for symbol in report.behavior.summary.resolved_apis: + yield String(symbol), NO_ADDRESS + + +def extract_used_services(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for svc in report.behavior.summary.created_services: + yield String(svc), NO_ADDRESS + for svc in report.behavior.summary.started_services: + yield String(svc), NO_ADDRESS + + +def extract_features(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for handler in FILE_HANDLERS: + for feature, addr in handler(report): + yield feature, addr + + +FILE_HANDLERS = ( + extract_import_names, + extract_export_names, + extract_section_names, + extract_file_strings, + extract_used_regkeys, + extract_used_files, + extract_used_mutexes, + extract_used_commands, + extract_used_apis, + extract_used_services, +) diff --git a/capa/features/extractors/cape/global_.py b/capa/features/extractors/cape/global_.py new file mode 100644 index 000000000..62eeff204 --- /dev/null +++ b/capa/features/extractors/cape/global_.py @@ -0,0 +1,93 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging +from typing import Tuple, Iterator + +from capa.features.common import ( + OS, + OS_ANY, + OS_LINUX, + ARCH_I386, + FORMAT_PE, + ARCH_AMD64, + FORMAT_ELF, + OS_WINDOWS, + Arch, + Format, + Feature, +) +from capa.features.address import NO_ADDRESS, Address +from capa.features.extractors.cape.models import CapeReport + +logger = logging.getLogger(__name__) + + +def extract_arch(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + if "Intel 80386" in report.target.file.type: + yield Arch(ARCH_I386), NO_ADDRESS + elif "x86-64" in report.target.file.type: + yield Arch(ARCH_AMD64), NO_ADDRESS + else: + logger.warning("unrecognized Architecture: %s", report.target.file.type) + raise ValueError( + f"unrecognized Architecture from the CAPE report; output of file command: {report.target.file.type}" + ) + + +def extract_format(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + if "PE" in report.target.file.type: + yield Format(FORMAT_PE), NO_ADDRESS + elif "ELF" in report.target.file.type: + yield Format(FORMAT_ELF), NO_ADDRESS + else: + logger.warning("unknown file format, file command output: %s", report.target.file.type) + raise ValueError( + "unrecognized file format from the CAPE report; output of file command: {report.target.file.type}" + ) + + +def extract_os(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + # this variable contains the output of the file command + file_output = report.target.file.type + + if "windows" in file_output.lower(): + yield OS(OS_WINDOWS), NO_ADDRESS + elif "elf" in file_output.lower(): + # operating systems recognized by the file command: https://github.com/file/file/blob/master/src/readelf.c#L609 + if "Linux" in file_output: + yield OS(OS_LINUX), NO_ADDRESS + elif "Hurd" in file_output: + yield OS("hurd"), NO_ADDRESS + elif "Solaris" in file_output: + yield OS("solaris"), NO_ADDRESS + elif "kFreeBSD" in file_output: + yield OS("freebsd"), NO_ADDRESS + elif "kNetBSD" in file_output: + yield OS("netbsd"), NO_ADDRESS + else: + # if the operating system information is missing from the cape report, it's likely a bug + logger.warning("unrecognized OS: %s", file_output) + raise ValueError("unrecognized OS from the CAPE report; output of file command: {file_output}") + else: + # the sample is shellcode + logger.debug("unsupported file format, file command output: %s", file_output) + yield OS(OS_ANY), NO_ADDRESS + + +def extract_features(report: CapeReport) -> Iterator[Tuple[Feature, Address]]: + for global_handler in GLOBAL_HANDLER: + for feature, addr in global_handler(report): + yield feature, addr + + +GLOBAL_HANDLER = ( + extract_format, + extract_os, + extract_arch, +) diff --git a/capa/features/extractors/cape/helpers.py b/capa/features/extractors/cape/helpers.py new file mode 100644 index 000000000..31dc6c91b --- /dev/null +++ b/capa/features/extractors/cape/helpers.py @@ -0,0 +1,29 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +from typing import Any, Dict, List + +from capa.features.extractors.base_extractor import ProcessHandle + + +def find_process(processes: List[Dict[str, Any]], ph: ProcessHandle) -> Dict[str, Any]: + """ + find a specific process identified by a process handler. + + args: + processes: a list of processes extracted by CAPE + ph: handle of the sought process + + return: + a CAPE-defined dictionary for the sought process' information + """ + + for process in processes: + if ph.address.ppid == process["parent_id"] and ph.address.pid == process["process_id"]: + return process + return {} diff --git a/capa/features/extractors/cape/models.py b/capa/features/extractors/cape/models.py new file mode 100644 index 000000000..79db9272d --- /dev/null +++ b/capa/features/extractors/cape/models.py @@ -0,0 +1,446 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import binascii +from typing import Any, Dict, List, Union, Literal, Optional + +from pydantic import Field, BaseModel, ConfigDict +from typing_extensions import Annotated, TypeAlias +from pydantic.functional_validators import BeforeValidator + + +def validate_hex_int(value): + if isinstance(value, str): + return int(value, 16) if value.startswith("0x") else int(value, 10) + else: + return value + + +def validate_hex_bytes(value): + return binascii.unhexlify(value) if isinstance(value, str) else value + + +HexInt = Annotated[int, BeforeValidator(validate_hex_int)] +HexBytes = Annotated[bytes, BeforeValidator(validate_hex_bytes)] + + +# a model that *cannot* have extra fields +# if they do, pydantic raises an exception. +# use this for models we rely upon and cannot change. +# +# for things that may be extended and we don't care, +# use FlexibleModel. +class ExactModel(BaseModel): + model_config = ConfigDict(extra="forbid") + + +# a model that can have extra fields that we ignore. +# use this if we don't want to raise an exception for extra +# data fields that we didn't expect. +class FlexibleModel(BaseModel): + pass + + +# use this type to indicate that we won't model this data. +# because its not relevant to our use in capa. +# +# while its nice to have full coverage of the data shape, +# it can easily change and break our parsing. +# so we really only want to describe what we'll use. +Skip: TypeAlias = Optional[Any] + + +# mark fields that we haven't seen yet and need to model. +# pydantic should raise an error when encountering data +# in a field with this type. +# then we can update the model with the discovered shape. +TODO: TypeAlias = None +ListTODO: TypeAlias = List[None] +DictTODO: TypeAlias = ExactModel + +EmptyDict: TypeAlias = BaseModel +EmptyList: TypeAlias = List[Any] + + +class Info(FlexibleModel): + version: str + + +class ImportedSymbol(ExactModel): + address: HexInt + name: Optional[str] = None + + +class ImportedDll(ExactModel): + dll: str + imports: List[ImportedSymbol] + + +class DirectoryEntry(ExactModel): + name: str + virtual_address: HexInt + size: HexInt + + +class Section(ExactModel): + name: str + raw_address: HexInt + virtual_address: HexInt + virtual_size: HexInt + size_of_data: HexInt + characteristics: str + characteristics_raw: HexInt + entropy: float + + +class Resource(ExactModel): + name: str + language: Optional[str] = None + sublanguage: str + filetype: Optional[str] + offset: HexInt + size: HexInt + entropy: float + + +class DigitalSigner(FlexibleModel): + md5_fingerprint: str + not_after: str + not_before: str + serial_number: str + sha1_fingerprint: str + sha256_fingerprint: str + + issuer_commonName: Optional[str] = None + issuer_countryName: Optional[str] = None + issuer_localityName: Optional[str] = None + issuer_organizationName: Optional[str] = None + issuer_stateOrProvinceName: Optional[str] = None + + subject_commonName: Optional[str] = None + subject_countryName: Optional[str] = None + subject_localityName: Optional[str] = None + subject_organizationName: Optional[str] = None + subject_stateOrProvinceName: Optional[str] = None + + extensions_authorityInfoAccess_caIssuers: Optional[str] = None + extensions_authorityKeyIdentifier: Optional[str] = None + extensions_cRLDistributionPoints_0: Optional[str] = None + extensions_certificatePolicies_0: Optional[str] = None + extensions_subjectAltName_0: Optional[str] = None + extensions_subjectKeyIdentifier: Optional[str] = None + + +class AuxSigner(ExactModel): + name: str + issued_to: str = Field(alias="Issued to") + issued_by: str = Field(alias="Issued by") + expires: str = Field(alias="Expires") + sha1_hash: str = Field(alias="SHA1 hash") + + +class Signer(ExactModel): + aux_sha1: Optional[str] = None + aux_timestamp: Optional[str] = None + aux_valid: Optional[bool] = None + aux_error: Optional[bool] = None + aux_error_desc: Optional[str] = None + aux_signers: Optional[List[AuxSigner]] = None + + +class Overlay(ExactModel): + offset: HexInt + size: HexInt + + +class KV(ExactModel): + name: str + value: str + + +class ExportedSymbol(ExactModel): + address: HexInt + name: str + ordinal: int + + +class PE(ExactModel): + peid_signatures: TODO + imagebase: HexInt + entrypoint: HexInt + reported_checksum: HexInt + actual_checksum: HexInt + osversion: str + pdbpath: Optional[str] = None + timestamp: str + + # List[ImportedDll], or Dict[basename(dll), ImportedDll] + imports: Union[List[ImportedDll], Dict[str, ImportedDll]] + imported_dll_count: Optional[int] = None + imphash: str + + exported_dll_name: Optional[str] = None + exports: List[ExportedSymbol] + + dirents: List[DirectoryEntry] + sections: List[Section] + + ep_bytes: Optional[HexBytes] = None + + overlay: Optional[Overlay] = None + resources: List[Resource] + versioninfo: List[KV] + + # base64 encoded data + icon: Optional[str] = None + # MD5-like hash + icon_hash: Optional[str] = None + # MD5-like hash + icon_fuzzy: Optional[str] = None + # short hex string + icon_dhash: Optional[str] = None + + digital_signers: List[DigitalSigner] + guest_signers: Signer + + +# TODO(mr-tz): target.file.dotnet, target.file.extracted_files, target.file.extracted_files_tool, +# target.file.extracted_files_time +# https://github.com/mandiant/capa/issues/1814 +class File(FlexibleModel): + type: str + cape_type_code: Optional[int] = None + cape_type: Optional[str] = None + + pid: Optional[Union[int, Literal[""]]] = None + name: Union[List[str], str] + path: str + guest_paths: Union[List[str], str, None] + timestamp: Optional[str] = None + + # + # hashes + # + crc32: str + md5: str + sha1: str + sha256: str + sha512: str + sha3_384: str + ssdeep: str + # unsure why this would ever be "False" + tlsh: Optional[Union[str, bool]] = None + rh_hash: Optional[str] = None + + # + # other metadata, static analysis + # + size: int + pe: Optional[PE] = None + ep_bytes: Optional[HexBytes] = None + entrypoint: Optional[int] = None + data: Optional[str] = None + strings: Optional[List[str]] = None + + # + # detections (skip) + # + yara: Skip = None + cape_yara: Skip = None + clamav: Skip = None + virustotal: Skip = None + + +class ProcessFile(File): + # + # like a File, but also has dynamic analysis results + # + pid: Optional[int] = None + process_path: Optional[str] = None + process_name: Optional[str] = None + module_path: Optional[str] = None + virtual_address: Optional[HexInt] = None + target_pid: Optional[Union[int, str]] = None + target_path: Optional[str] = None + target_process: Optional[str] = None + + +class Argument(ExactModel): + name: str + # unsure why empty list is provided here + value: Union[HexInt, int, str, EmptyList] + pretty_value: Optional[str] = None + + +class Call(ExactModel): + timestamp: str + thread_id: int + category: str + + api: str + + arguments: List[Argument] + status: bool + return_: HexInt = Field(alias="return") + pretty_return: Optional[str] = None + + repeated: int + + # virtual addresses + caller: HexInt + parentcaller: HexInt + + # index into calls array + id: int + + +class Process(ExactModel): + process_id: int + process_name: str + parent_id: int + module_path: str + first_seen: str + calls: List[Call] + threads: List[int] + environ: Dict[str, str] + + +class ProcessTree(ExactModel): + name: str + pid: int + parent_id: int + module_path: str + threads: List[int] + environ: Dict[str, str] + children: List["ProcessTree"] + + +class Summary(ExactModel): + files: List[str] + read_files: List[str] + write_files: List[str] + delete_files: List[str] + keys: List[str] + read_keys: List[str] + write_keys: List[str] + delete_keys: List[str] + executed_commands: List[str] + resolved_apis: List[str] + mutexes: List[str] + created_services: List[str] + started_services: List[str] + + +class EncryptedBuffer(ExactModel): + process_name: str + pid: int + + api_call: str + buffer: str + buffer_size: Optional[int] = None + crypt_key: Optional[Union[HexInt, str]] = None + + +class Behavior(ExactModel): + summary: Summary + + # list of processes, of threads, of calls + processes: List[Process] + # tree of processes + processtree: List[ProcessTree] + + anomaly: List[str] + encryptedbuffers: List[EncryptedBuffer] + # these are small objects that describe atomic events, + # like file move, registery access. + # we'll detect the same with our API call analyis. + enhanced: Skip = None + + +class Target(ExactModel): + category: str + file: File + pe: Optional[PE] = None + + +class Static(ExactModel): + pe: Optional[PE] = None + flare_capa: Skip = None + + +class Cape(ExactModel): + payloads: List[ProcessFile] + configs: Skip = None + + +# flexible because there may be more sorts of analysis +# but we only care about the ones described here. +class CapeReport(FlexibleModel): + # the input file, I think + target: Target + # info about the processing job, like machine and distributed metadata. + info: Info + + # + # static analysis results + # + static: Optional[Static] = None + strings: Optional[List[str]] = None + + # + # dynamic analysis results + # + # post-processed results: process tree, anomalies, etc + behavior: Behavior + + # post-processed results: payloads and extracted configs + CAPE: Optional[Cape] = None + dropped: Optional[List[File]] = None + procdump: Optional[List[ProcessFile]] = None + procmemory: ListTODO + + # ========================================================================= + # information we won't use in capa + # + + # + # NBIs and HBIs + # these are super interesting, but they don't enable use to detect behaviors. + # they take a lot of code to model and details to maintain. + # + # if we come up with a future use for this, go ahead and re-enable! + # + network: Skip = None + suricata: Skip = None + curtain: Skip = None + sysmon: Skip = None + url_analysis: Skip = None + + # screenshot hash values + deduplicated_shots: Skip = None + # k-v pairs describing the time it took to run each stage. + statistics: Skip = None + # k-v pairs of ATT&CK ID to signature name or similar. + ttps: Skip = None + # debug log messages + debug: Skip = None + + # various signature matches + # we could potentially extend capa to use this info one day, + # though it would be quite sandbox-specific, + # and more detection-oriented than capability detection. + signatures: Skip = None + malfamily_tag: Optional[str] = None + malscore: float + detections: Skip = None + detections2pid: Optional[Dict[int, List[str]]] = None + # AV detections for the sample. + virustotal: Skip = None + + @classmethod + def from_buf(cls, buf: bytes) -> "CapeReport": + return cls.model_validate_json(buf) diff --git a/capa/features/extractors/cape/process.py b/capa/features/extractors/cape/process.py new file mode 100644 index 000000000..909a9637e --- /dev/null +++ b/capa/features/extractors/cape/process.py @@ -0,0 +1,48 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging +from typing import List, Tuple, Iterator + +from capa.features.common import String, Feature +from capa.features.address import Address, ThreadAddress +from capa.features.extractors.cape.models import Process +from capa.features.extractors.base_extractor import ThreadHandle, ProcessHandle + +logger = logging.getLogger(__name__) + + +def get_threads(ph: ProcessHandle) -> Iterator[ThreadHandle]: + """ + get the threads associated with a given process + """ + process: Process = ph.inner + threads: List[int] = process.threads + + for thread in threads: + address: ThreadAddress = ThreadAddress(process=ph.address, tid=thread) + yield ThreadHandle(address=address, inner={}) + + +def extract_environ_strings(ph: ProcessHandle) -> Iterator[Tuple[Feature, Address]]: + """ + extract strings from a process' provided environment variables. + """ + process: Process = ph.inner + + for value in (value for value in process.environ.values() if value): + yield String(value), ph.address + + +def extract_features(ph: ProcessHandle) -> Iterator[Tuple[Feature, Address]]: + for handler in PROCESS_HANDLERS: + for feature, addr in handler(ph): + yield feature, addr + + +PROCESS_HANDLERS = (extract_environ_strings,) diff --git a/capa/features/extractors/cape/thread.py b/capa/features/extractors/cape/thread.py new file mode 100644 index 000000000..648b092ee --- /dev/null +++ b/capa/features/extractors/cape/thread.py @@ -0,0 +1,32 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging +from typing import Iterator + +from capa.features.address import DynamicCallAddress +from capa.features.extractors.helpers import generate_symbols +from capa.features.extractors.cape.models import Process +from capa.features.extractors.base_extractor import CallHandle, ThreadHandle, ProcessHandle + +logger = logging.getLogger(__name__) + + +def get_calls(ph: ProcessHandle, th: ThreadHandle) -> Iterator[CallHandle]: + process: Process = ph.inner + + tid = th.address.tid + for call_index, call in enumerate(process.calls): + if call.thread_id != tid: + continue + + for symbol in generate_symbols("", call.api): + call.api = symbol + + addr = DynamicCallAddress(thread=th.address, id=call_index) + yield CallHandle(address=addr, inner=call) diff --git a/capa/features/extractors/common.py b/capa/features/extractors/common.py index 2d4f0266b..b7bb3c399 100644 --- a/capa/features/extractors/common.py +++ b/capa/features/extractors/common.py @@ -6,6 +6,7 @@ # is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and limitations under the License. import io +import re import logging import binascii import contextlib @@ -41,6 +42,7 @@ MATCH_PE = b"MZ" MATCH_ELF = b"\x7fELF" MATCH_RESULT = b'{"meta":' +MATCH_JSON_OBJECT = b'{"' def extract_file_strings(buf, **kwargs) -> Iterator[Tuple[String, Address]]: @@ -63,6 +65,11 @@ def extract_format(buf) -> Iterator[Tuple[Feature, Address]]: yield Format(FORMAT_FREEZE), NO_ADDRESS elif buf.startswith(MATCH_RESULT): yield Format(FORMAT_RESULT), NO_ADDRESS + elif re.sub(rb"\s", b"", buf[:20]).startswith(MATCH_JSON_OBJECT): + # potential start of JSON object data without whitespace + # we don't know what it is exactly, but may support it (e.g. a dynamic CAPE sandbox report) + # skip verdict here and let subsequent code analyze this further + return else: # we likely end up here: # 1. handling a file format (e.g. macho) diff --git a/capa/features/extractors/dnfile/extractor.py b/capa/features/extractors/dnfile/extractor.py index 98a1dd0b8..f1430fbde 100644 --- a/capa/features/extractors/dnfile/extractor.py +++ b/capa/features/extractors/dnfile/extractor.py @@ -22,7 +22,13 @@ from capa.features.common import Feature from capa.features.address import NO_ADDRESS, Address, DNTokenAddress, DNTokenOffsetAddress from capa.features.extractors.dnfile.types import DnType, DnUnmanagedMethod -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.extractors.base_extractor import ( + BBHandle, + InsnHandle, + SampleHashes, + FunctionHandle, + StaticFeatureExtractor, +) from capa.features.extractors.dnfile.helpers import ( get_dotnet_types, get_dotnet_fields, @@ -68,10 +74,10 @@ def get_type(self, token: int) -> Optional[Union[DnType, DnUnmanagedMethod]]: return self.types.get(token) -class DnfileFeatureExtractor(FeatureExtractor): +class DnfileFeatureExtractor(StaticFeatureExtractor): def __init__(self, path: Path): - super().__init__() self.pe: dnfile.dnPE = dnfile.dnPE(str(path)) + super().__init__(hashes=SampleHashes.from_bytes(path.read_bytes())) # pre-compute .NET token lookup tables; each .NET method has access to this cache for feature extraction # most relevant at instruction scope diff --git a/capa/features/extractors/dnfile_.py b/capa/features/extractors/dnfile_.py index 180d13089..72dc9b7e7 100644 --- a/capa/features/extractors/dnfile_.py +++ b/capa/features/extractors/dnfile_.py @@ -25,7 +25,7 @@ Feature, ) from capa.features.address import NO_ADDRESS, Address, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import FeatureExtractor +from capa.features.extractors.base_extractor import SampleHashes, StaticFeatureExtractor logger = logging.getLogger(__name__) @@ -55,7 +55,7 @@ def extract_file_arch(pe: dnfile.dnPE, **kwargs) -> Iterator[Tuple[Feature, Addr def extract_file_features(pe: dnfile.dnPE) -> Iterator[Tuple[Feature, Address]]: for file_handler in FILE_HANDLERS: - for feature, address in file_handler(pe=pe): # type: ignore + for feature, address in file_handler(pe=pe): yield feature, address @@ -81,9 +81,9 @@ def extract_global_features(pe: dnfile.dnPE) -> Iterator[Tuple[Feature, Address] ) -class DnfileFeatureExtractor(FeatureExtractor): +class DnfileFeatureExtractor(StaticFeatureExtractor): def __init__(self, path: Path): - super().__init__() + super().__init__(hashes=SampleHashes.from_bytes(path.read_bytes())) self.path: Path = path self.pe: dnfile.dnPE = dnfile.dnPE(str(path)) diff --git a/capa/features/extractors/dotnetfile.py b/capa/features/extractors/dotnetfile.py index 76672e51b..a9d36d299 100644 --- a/capa/features/extractors/dotnetfile.py +++ b/capa/features/extractors/dotnetfile.py @@ -31,9 +31,9 @@ Characteristic, ) from capa.features.address import NO_ADDRESS, Address, DNTokenAddress -from capa.features.extractors.base_extractor import FeatureExtractor +from capa.features.extractors.dnfile.types import DnType +from capa.features.extractors.base_extractor import SampleHashes, StaticFeatureExtractor from capa.features.extractors.dnfile.helpers import ( - DnType, iter_dotnet_table, is_dotnet_mixed_mode, get_dotnet_managed_imports, @@ -57,7 +57,7 @@ def extract_file_import_names(pe: dnfile.dnPE, **kwargs) -> Iterator[Tuple[Impor for imp in get_dotnet_unmanaged_imports(pe): # like kernel32.CreateFileA - for name in capa.features.extractors.helpers.generate_symbols(imp.module, imp.method): + for name in capa.features.extractors.helpers.generate_symbols(imp.module, imp.method, include_dll=True): yield Import(name), DNTokenAddress(imp.token) @@ -165,9 +165,9 @@ def extract_global_features(pe: dnfile.dnPE) -> Iterator[Tuple[Feature, Address] ) -class DotnetFileFeatureExtractor(FeatureExtractor): +class DotnetFileFeatureExtractor(StaticFeatureExtractor): def __init__(self, path: Path): - super().__init__() + super().__init__(hashes=SampleHashes.from_bytes(path.read_bytes())) self.path: Path = path self.pe: dnfile.dnPE = dnfile.dnPE(str(path)) diff --git a/capa/features/extractors/elffile.py b/capa/features/extractors/elffile.py index 8ed74e877..5881c0358 100644 --- a/capa/features/extractors/elffile.py +++ b/capa/features/extractors/elffile.py @@ -17,7 +17,7 @@ from capa.features.file import Export, Import, Section from capa.features.common import OS, FORMAT_ELF, Arch, Format, Feature from capa.features.address import NO_ADDRESS, FileOffsetAddress, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import FeatureExtractor +from capa.features.extractors.base_extractor import SampleHashes, StaticFeatureExtractor logger = logging.getLogger(__name__) @@ -154,9 +154,9 @@ def extract_global_features(elf: ELFFile, buf: bytes) -> Iterator[Tuple[Feature, ) -class ElfFeatureExtractor(FeatureExtractor): +class ElfFeatureExtractor(StaticFeatureExtractor): def __init__(self, path: Path): - super().__init__() + super().__init__(SampleHashes.from_bytes(path.read_bytes())) self.path: Path = path self.elf = ELFFile(io.BytesIO(path.read_bytes())) diff --git a/capa/features/extractors/ghidra/extractor.py b/capa/features/extractors/ghidra/extractor.py index d4439f0f1..0c3db5871 100644 --- a/capa/features/extractors/ghidra/extractor.py +++ b/capa/features/extractors/ghidra/extractor.py @@ -14,14 +14,32 @@ import capa.features.extractors.ghidra.basicblock from capa.features.common import Feature from capa.features.address import Address, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.extractors.base_extractor import ( + BBHandle, + InsnHandle, + SampleHashes, + FunctionHandle, + StaticFeatureExtractor, +) -class GhidraFeatureExtractor(FeatureExtractor): +class GhidraFeatureExtractor(StaticFeatureExtractor): def __init__(self): - super().__init__() import capa.features.extractors.ghidra.helpers as ghidra_helpers + super().__init__( + SampleHashes( + md5=capa.ghidra.helpers.get_file_md5(), + # ghidra doesn't expose this hash. + # https://ghidra.re/ghidra_docs/api/ghidra/program/model/listing/Program.html + # + # the hashes are stored in the database, not computed on the fly, + # so its probably not trivial to add SHA1. + sha1="", + sha256=capa.ghidra.helpers.get_file_sha256(), + ) + ) + self.global_features: List[Tuple[Feature, Address]] = [] self.global_features.extend(capa.features.extractors.ghidra.file.extract_file_format()) self.global_features.extend(capa.features.extractors.ghidra.global_.extract_os()) diff --git a/capa/features/extractors/ghidra/file.py b/capa/features/extractors/ghidra/file.py index f0bb0d047..118575c17 100644 --- a/capa/features/extractors/ghidra/file.py +++ b/capa/features/extractors/ghidra/file.py @@ -34,7 +34,7 @@ def find_embedded_pe(block_bytez: bytes, mz_xor: List[Tuple[bytes, bytes, int]]) for match in re.finditer(re.escape(mzx), block_bytez): todo.append((match.start(), mzx, pex, i)) - seg_max = len(block_bytez) # type: ignore [name-defined] # noqa: F821 + seg_max = len(block_bytez) # noqa: F821 while len(todo): off, mzx, pex, i = todo.pop() @@ -112,7 +112,7 @@ def extract_file_import_names() -> Iterator[Tuple[Feature, Address]]: if "Ordinal_" in fstr[1]: fstr[1] = f"#{fstr[1].split('_')[1]}" - for name in capa.features.extractors.helpers.generate_symbols(fstr[0][:-4], fstr[1]): + for name in capa.features.extractors.helpers.generate_symbols(fstr[0][:-4], fstr[1], include_dll=True): yield Import(name), AbsoluteVirtualAddress(addr) diff --git a/capa/features/extractors/helpers.py b/capa/features/extractors/helpers.py index e17a66f2d..71d28ef52 100644 --- a/capa/features/extractors/helpers.py +++ b/capa/features/extractors/helpers.py @@ -41,38 +41,49 @@ def is_ordinal(symbol: str) -> bool: return False -def generate_symbols(dll: str, symbol: str) -> Iterator[str]: +def generate_symbols(dll: str, symbol: str, include_dll=False) -> Iterator[str]: """ for a given dll and symbol name, generate variants. we over-generate features to make matching easier. these include: - - kernel32.CreateFileA - - kernel32.CreateFile - CreateFileA - CreateFile + - ws2_32.#1 + + note that since capa v7 only `import` features include DLL names: + - kernel32.CreateFileA + - kernel32.CreateFile + + for `api` features dll names are good for documentation but not used during matching """ # normalize dll name dll = dll.lower() - # kernel32.CreateFileA - yield f"{dll}.{symbol}" + # trim extensions observed in dynamic traces + dll = dll[0:-4] if dll.endswith(".dll") else dll + dll = dll[0:-4] if dll.endswith(".drv") else dll + + if include_dll: + # ws2_32.#1 + # kernel32.CreateFileA + yield f"{dll}.{symbol}" if not is_ordinal(symbol): # CreateFileA yield symbol - if is_aw_function(symbol): - # kernel32.CreateFile - yield f"{dll}.{symbol[:-1]}" + if include_dll: + # kernel32.CreateFile + yield f"{dll}.{symbol[:-1]}" - if not is_ordinal(symbol): + if is_aw_function(symbol): # CreateFile yield symbol[:-1] def reformat_forwarded_export_name(forwarded_name: str) -> str: """ - a forwarded export has a DLL name/path an symbol name. + a forwarded export has a DLL name/path and symbol name. we want the former to be lowercase, and the latter to be verbatim. """ diff --git a/capa/features/extractors/ida/extractor.py b/capa/features/extractors/ida/extractor.py index bf5d16825..e73db2ad7 100644 --- a/capa/features/extractors/ida/extractor.py +++ b/capa/features/extractors/ida/extractor.py @@ -8,6 +8,7 @@ from typing import List, Tuple, Iterator import idaapi +import ida_nalt import capa.ida.helpers import capa.features.extractors.elf @@ -18,12 +19,22 @@ import capa.features.extractors.ida.basicblock from capa.features.common import Feature from capa.features.address import Address, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.extractors.base_extractor import ( + BBHandle, + InsnHandle, + SampleHashes, + FunctionHandle, + StaticFeatureExtractor, +) -class IdaFeatureExtractor(FeatureExtractor): +class IdaFeatureExtractor(StaticFeatureExtractor): def __init__(self): - super().__init__() + super().__init__( + hashes=SampleHashes( + md5=ida_nalt.retrieve_input_file_md5(), sha1="(unknown)", sha256=ida_nalt.retrieve_input_file_sha256() + ) + ) self.global_features: List[Tuple[Feature, Address]] = [] self.global_features.extend(capa.features.extractors.ida.file.extract_file_format()) self.global_features.extend(capa.features.extractors.ida.global_.extract_os()) diff --git a/capa/features/extractors/ida/file.py b/capa/features/extractors/ida/file.py index efa4b66c7..24f9528fd 100644 --- a/capa/features/extractors/ida/file.py +++ b/capa/features/extractors/ida/file.py @@ -110,7 +110,7 @@ def extract_file_import_names() -> Iterator[Tuple[Feature, Address]]: if info[1] and info[2]: # e.g. in mimikatz: ('cabinet', 'FCIAddFile', 11L) # extract by name here and by ordinal below - for name in capa.features.extractors.helpers.generate_symbols(info[0], info[1]): + for name in capa.features.extractors.helpers.generate_symbols(info[0], info[1], include_dll=True): yield Import(name), addr dll = info[0] symbol = f"#{info[2]}" @@ -123,7 +123,7 @@ def extract_file_import_names() -> Iterator[Tuple[Feature, Address]]: else: continue - for name in capa.features.extractors.helpers.generate_symbols(dll, symbol): + for name in capa.features.extractors.helpers.generate_symbols(dll, symbol, include_dll=True): yield Import(name), addr for ea, info in capa.features.extractors.ida.helpers.get_file_externs().items(): diff --git a/capa/features/extractors/null.py b/capa/features/extractors/null.py index c7206ced2..37bd914c9 100644 --- a/capa/features/extractors/null.py +++ b/capa/features/extractors/null.py @@ -5,12 +5,24 @@ # Unless required by applicable law or agreed to in writing, software distributed under the License # is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and limitations under the License. -from typing import Dict, List, Tuple +from typing import Dict, List, Tuple, Union from dataclasses import dataclass +from typing_extensions import TypeAlias + from capa.features.common import Feature -from capa.features.address import NO_ADDRESS, Address -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.address import NO_ADDRESS, Address, ThreadAddress, ProcessAddress, DynamicCallAddress +from capa.features.extractors.base_extractor import ( + BBHandle, + CallHandle, + InsnHandle, + SampleHashes, + ThreadHandle, + ProcessHandle, + FunctionHandle, + StaticFeatureExtractor, + DynamicFeatureExtractor, +) @dataclass @@ -31,7 +43,7 @@ class FunctionFeatures: @dataclass -class NullFeatureExtractor(FeatureExtractor): +class NullStaticFeatureExtractor(StaticFeatureExtractor): """ An extractor that extracts some user-provided features. @@ -39,6 +51,7 @@ class NullFeatureExtractor(FeatureExtractor): """ base_address: Address + sample_hashes: SampleHashes global_features: List[Feature] file_features: List[Tuple[Address, Feature]] functions: Dict[Address, FunctionFeatures] @@ -46,6 +59,9 @@ class NullFeatureExtractor(FeatureExtractor): def get_base_address(self): return self.base_address + def get_sample_hashes(self) -> SampleHashes: + return self.sample_hashes + def extract_global_features(self): for feature in self.global_features: yield feature, NO_ADDRESS @@ -77,3 +93,78 @@ def get_instructions(self, f, bb): def extract_insn_features(self, f, bb, insn): for address, feature in self.functions[f.address].basic_blocks[bb.address].instructions[insn.address].features: yield feature, address + + +@dataclass +class CallFeatures: + name: str + features: List[Tuple[Address, Feature]] + + +@dataclass +class ThreadFeatures: + features: List[Tuple[Address, Feature]] + calls: Dict[Address, CallFeatures] + + +@dataclass +class ProcessFeatures: + features: List[Tuple[Address, Feature]] + threads: Dict[Address, ThreadFeatures] + name: str + + +@dataclass +class NullDynamicFeatureExtractor(DynamicFeatureExtractor): + base_address: Address + sample_hashes: SampleHashes + global_features: List[Feature] + file_features: List[Tuple[Address, Feature]] + processes: Dict[Address, ProcessFeatures] + + def extract_global_features(self): + for feature in self.global_features: + yield feature, NO_ADDRESS + + def get_sample_hashes(self) -> SampleHashes: + return self.sample_hashes + + def extract_file_features(self): + for address, feature in self.file_features: + yield feature, address + + def get_processes(self): + for address in sorted(self.processes.keys()): + assert isinstance(address, ProcessAddress) + yield ProcessHandle(address=address, inner={}) + + def extract_process_features(self, ph): + for addr, feature in self.processes[ph.address].features: + yield feature, addr + + def get_process_name(self, ph) -> str: + return self.processes[ph.address].name + + def get_threads(self, ph): + for address in sorted(self.processes[ph.address].threads.keys()): + assert isinstance(address, ThreadAddress) + yield ThreadHandle(address=address, inner={}) + + def extract_thread_features(self, ph, th): + for addr, feature in self.processes[ph.address].threads[th.address].features: + yield feature, addr + + def get_calls(self, ph, th): + for address in sorted(self.processes[ph.address].threads[th.address].calls.keys()): + assert isinstance(address, DynamicCallAddress) + yield CallHandle(address=address, inner={}) + + def extract_call_features(self, ph, th, ch): + for address, feature in self.processes[ph.address].threads[th.address].calls[ch.address].features: + yield feature, address + + def get_call_name(self, ph, th, ch) -> str: + return self.processes[ph.address].threads[th.address].calls[ch.address].name + + +NullFeatureExtractor: TypeAlias = Union[NullStaticFeatureExtractor, NullDynamicFeatureExtractor] diff --git a/capa/features/extractors/pefile.py b/capa/features/extractors/pefile.py index c51675e8b..abd917c07 100644 --- a/capa/features/extractors/pefile.py +++ b/capa/features/extractors/pefile.py @@ -19,7 +19,7 @@ from capa.features.file import Export, Import, Section from capa.features.common import OS, ARCH_I386, FORMAT_PE, ARCH_AMD64, OS_WINDOWS, Arch, Format, Characteristic from capa.features.address import NO_ADDRESS, FileOffsetAddress, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import FeatureExtractor +from capa.features.extractors.base_extractor import SampleHashes, StaticFeatureExtractor logger = logging.getLogger(__name__) @@ -84,7 +84,7 @@ def extract_file_import_names(pe, **kwargs): except UnicodeDecodeError: continue - for name in capa.features.extractors.helpers.generate_symbols(modname, impname): + for name in capa.features.extractors.helpers.generate_symbols(modname, impname, include_dll=True): yield Import(name), AbsoluteVirtualAddress(imp.address) @@ -185,9 +185,9 @@ def extract_global_features(pe, buf): ) -class PefileFeatureExtractor(FeatureExtractor): +class PefileFeatureExtractor(StaticFeatureExtractor): def __init__(self, path: Path): - super().__init__() + super().__init__(hashes=SampleHashes.from_bytes(path.read_bytes())) self.path: Path = path self.pe = pefile.PE(str(path)) diff --git a/capa/features/extractors/viv/basicblock.py b/capa/features/extractors/viv/basicblock.py index 46bdb2b09..0a276ee1d 100644 --- a/capa/features/extractors/viv/basicblock.py +++ b/capa/features/extractors/viv/basicblock.py @@ -140,7 +140,7 @@ def is_printable_ascii(chars: bytes) -> bool: def is_printable_utf16le(chars: bytes) -> bool: - if all(c == b"\x00" for c in chars[1::2]): + if all(c == 0x0 for c in chars[1::2]): return is_printable_ascii(chars[::2]) return False diff --git a/capa/features/extractors/viv/extractor.py b/capa/features/extractors/viv/extractor.py index faddb05d1..86b905c02 100644 --- a/capa/features/extractors/viv/extractor.py +++ b/capa/features/extractors/viv/extractor.py @@ -20,17 +20,23 @@ import capa.features.extractors.viv.basicblock from capa.features.common import Feature from capa.features.address import Address, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.extractors.base_extractor import ( + BBHandle, + InsnHandle, + SampleHashes, + FunctionHandle, + StaticFeatureExtractor, +) logger = logging.getLogger(__name__) -class VivisectFeatureExtractor(FeatureExtractor): +class VivisectFeatureExtractor(StaticFeatureExtractor): def __init__(self, vw, path: Path, os): - super().__init__() self.vw = vw self.path = path self.buf = path.read_bytes() + super().__init__(hashes=SampleHashes.from_bytes(self.buf)) # pre-compute these because we'll yield them at *every* scope. self.global_features: List[Tuple[Feature, Address]] = [] diff --git a/capa/features/extractors/viv/file.py b/capa/features/extractors/viv/file.py index 204d8e693..52d56accd 100644 --- a/capa/features/extractors/viv/file.py +++ b/capa/features/extractors/viv/file.py @@ -73,7 +73,7 @@ def extract_file_import_names(vw, **kwargs) -> Iterator[Tuple[Feature, Address]] impname = "#" + impname[len("ord") :] addr = AbsoluteVirtualAddress(va) - for name in capa.features.extractors.helpers.generate_symbols(modname, impname): + for name in capa.features.extractors.helpers.generate_symbols(modname, impname, include_dll=True): yield Import(name), addr diff --git a/capa/features/freeze/__init__.py b/capa/features/freeze/__init__.py index 8eb953b7f..9e3f73310 100644 --- a/capa/features/freeze/__init__.py +++ b/capa/features/freeze/__init__.py @@ -9,13 +9,18 @@ is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. """ +import json import zlib import logging from enum import Enum -from typing import List, Tuple, Union +from typing import List, Tuple, Union, Literal from pydantic import Field, BaseModel, ConfigDict +# TODO(williballenthin): use typing.TypeAlias directly in Python 3.10+ +# https://github.com/mandiant/capa/issues/1699 +from typing_extensions import TypeAlias + import capa.helpers import capa.version import capa.features.file @@ -23,12 +28,20 @@ import capa.features.common import capa.features.address import capa.features.basicblock -import capa.features.extractors.base_extractor +import capa.features.extractors.null as null from capa.helpers import assert_never from capa.features.freeze.features import Feature, feature_from_capa +from capa.features.extractors.base_extractor import ( + SampleHashes, + FeatureExtractor, + StaticFeatureExtractor, + DynamicFeatureExtractor, +) logger = logging.getLogger(__name__) +CURRENT_VERSION = 3 + class HashableModel(BaseModel): model_config = ConfigDict(frozen=True) @@ -40,12 +53,15 @@ class AddressType(str, Enum): FILE = "file" DN_TOKEN = "dn token" DN_TOKEN_OFFSET = "dn token offset" + PROCESS = "process" + THREAD = "thread" + CALL = "call" NO_ADDRESS = "no address" class Address(HashableModel): type: AddressType - value: Union[int, Tuple[int, int], None] = None # None default value to support deserialization of NO_ADDRESS + value: Union[int, Tuple[int, ...], None] = None # None default value to support deserialization of NO_ADDRESS @classmethod def from_capa(cls, a: capa.features.address.Address) -> "Address": @@ -64,6 +80,15 @@ def from_capa(cls, a: capa.features.address.Address) -> "Address": elif isinstance(a, capa.features.address.DNTokenOffsetAddress): return cls(type=AddressType.DN_TOKEN_OFFSET, value=(a.token, a.offset)) + elif isinstance(a, capa.features.address.ProcessAddress): + return cls(type=AddressType.PROCESS, value=(a.ppid, a.pid)) + + elif isinstance(a, capa.features.address.ThreadAddress): + return cls(type=AddressType.THREAD, value=(a.process.ppid, a.process.pid, a.tid)) + + elif isinstance(a, capa.features.address.DynamicCallAddress): + return cls(type=AddressType.CALL, value=(a.thread.process.ppid, a.thread.process.pid, a.thread.tid, a.id)) + elif a == capa.features.address.NO_ADDRESS or isinstance(a, capa.features.address._NoAddress): return cls(type=AddressType.NO_ADDRESS, value=None) @@ -100,6 +125,33 @@ def to_capa(self) -> capa.features.address.Address: assert isinstance(offset, int) return capa.features.address.DNTokenOffsetAddress(token, offset) + elif self.type is AddressType.PROCESS: + assert isinstance(self.value, tuple) + ppid, pid = self.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + return capa.features.address.ProcessAddress(ppid=ppid, pid=pid) + + elif self.type is AddressType.THREAD: + assert isinstance(self.value, tuple) + ppid, pid, tid = self.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + assert isinstance(tid, int) + return capa.features.address.ThreadAddress( + process=capa.features.address.ProcessAddress(ppid=ppid, pid=pid), tid=tid + ) + + elif self.type is AddressType.CALL: + assert isinstance(self.value, tuple) + ppid, pid, tid, id_ = self.value + return capa.features.address.DynamicCallAddress( + thread=capa.features.address.ThreadAddress( + process=capa.features.address.ProcessAddress(ppid=ppid, pid=pid), tid=tid + ), + id=id_, + ) + elif self.type is AddressType.NO_ADDRESS: return capa.features.address.NO_ADDRESS @@ -130,6 +182,48 @@ class FileFeature(HashableModel): feature: Feature +class ProcessFeature(HashableModel): + """ + args: + process: the address of the process to which this feature belongs. + address: the address at which this feature is found. + + process != address because, e.g., the feature may be found *within* the scope (process). + """ + + process: Address + address: Address + feature: Feature + + +class ThreadFeature(HashableModel): + """ + args: + thread: the address of the thread to which this feature belongs. + address: the address at which this feature is found. + + thread != address because, e.g., the feature may be found *within* the scope (thread). + """ + + thread: Address + address: Address + feature: Feature + + +class CallFeature(HashableModel): + """ + args: + call: the address of the call to which this feature belongs. + address: the address at which this feature is found. + + call != address for consistency with Process and Thread. + """ + + call: Address + address: Address + feature: Feature + + class FunctionFeature(HashableModel): """ args: @@ -167,8 +261,7 @@ class InstructionFeature(HashableModel): instruction: the address of the instruction to which this feature belongs. address: the address at which this feature is found. - instruction != address because, e.g., the feature may be found *within* the scope (basic block), - versus right at its starting address. + instruction != address because, for consistency with Function and BasicBlock. """ instruction: Address @@ -194,13 +287,42 @@ class FunctionFeatures(BaseModel): model_config = ConfigDict(populate_by_name=True) -class Features(BaseModel): +class CallFeatures(BaseModel): + address: Address + name: str + features: Tuple[CallFeature, ...] + + +class ThreadFeatures(BaseModel): + address: Address + features: Tuple[ThreadFeature, ...] + calls: Tuple[CallFeatures, ...] + + +class ProcessFeatures(BaseModel): + address: Address + name: str + features: Tuple[ProcessFeature, ...] + threads: Tuple[ThreadFeatures, ...] + + +class StaticFeatures(BaseModel): global_: Tuple[GlobalFeature, ...] = Field(alias="global") file: Tuple[FileFeature, ...] functions: Tuple[FunctionFeatures, ...] model_config = ConfigDict(populate_by_name=True) +class DynamicFeatures(BaseModel): + global_: Tuple[GlobalFeature, ...] = Field(alias="global") + file: Tuple[FileFeature, ...] + processes: Tuple[ProcessFeatures, ...] + model_config = ConfigDict(populate_by_name=True) + + +Features: TypeAlias = Union[StaticFeatures, DynamicFeatures] + + class Extractor(BaseModel): name: str version: str = capa.version.__version__ @@ -208,18 +330,19 @@ class Extractor(BaseModel): class Freeze(BaseModel): - version: int = 2 + version: int = CURRENT_VERSION base_address: Address = Field(alias="base address") + sample_hashes: SampleHashes + flavor: Literal["static", "dynamic"] extractor: Extractor features: Features model_config = ConfigDict(populate_by_name=True) -def dumps(extractor: capa.features.extractors.base_extractor.FeatureExtractor) -> str: +def dumps_static(extractor: StaticFeatureExtractor) -> str: """ serialize the given extractor to a string """ - global_features: List[GlobalFeature] = [] for feature, _ in extractor.extract_global_features(): global_features.append( @@ -298,7 +421,7 @@ def dumps(extractor: capa.features.extractors.base_extractor.FeatureExtractor) - # Mypy is unable to recognise `basic_blocks` as a argument due to alias ) - features = Features( + features = StaticFeatures( global_=global_features, file=tuple(file_features), functions=tuple(function_features), @@ -306,8 +429,10 @@ def dumps(extractor: capa.features.extractors.base_extractor.FeatureExtractor) - # Mypy is unable to recognise `global_` as a argument due to alias freeze = Freeze( - version=2, + version=CURRENT_VERSION, base_address=Address.from_capa(extractor.get_base_address()), + sample_hashes=extractor.get_sample_hashes(), + flavor="static", extractor=Extractor(name=extractor.__class__.__name__), features=features, ) # type: ignore @@ -316,16 +441,127 @@ def dumps(extractor: capa.features.extractors.base_extractor.FeatureExtractor) - return freeze.model_dump_json() -def loads(s: str) -> capa.features.extractors.base_extractor.FeatureExtractor: - """deserialize a set of features (as a NullFeatureExtractor) from a string.""" - import capa.features.extractors.null as null +def dumps_dynamic(extractor: DynamicFeatureExtractor) -> str: + """ + serialize the given extractor to a string + """ + global_features: List[GlobalFeature] = [] + for feature, _ in extractor.extract_global_features(): + global_features.append( + GlobalFeature( + feature=feature_from_capa(feature), + ) + ) + + file_features: List[FileFeature] = [] + for feature, address in extractor.extract_file_features(): + file_features.append( + FileFeature( + feature=feature_from_capa(feature), + address=Address.from_capa(address), + ) + ) + + process_features: List[ProcessFeatures] = [] + for p in extractor.get_processes(): + paddr = Address.from_capa(p.address) + pname = extractor.get_process_name(p) + pfeatures = [ + ProcessFeature( + process=paddr, + address=Address.from_capa(addr), + feature=feature_from_capa(feature), + ) + for feature, addr in extractor.extract_process_features(p) + ] + + threads = [] + for t in extractor.get_threads(p): + taddr = Address.from_capa(t.address) + tfeatures = [ + ThreadFeature( + basic_block=taddr, + address=Address.from_capa(addr), + feature=feature_from_capa(feature), + ) # type: ignore + # Mypy is unable to recognise `basic_block` as a argument due to alias + for feature, addr in extractor.extract_thread_features(p, t) + ] + + calls = [] + for call in extractor.get_calls(p, t): + caddr = Address.from_capa(call.address) + cname = extractor.get_call_name(p, t, call) + cfeatures = [ + CallFeature( + call=caddr, + address=Address.from_capa(addr), + feature=feature_from_capa(feature), + ) + for feature, addr in extractor.extract_call_features(p, t, call) + ] + + calls.append( + CallFeatures( + address=caddr, + name=cname, + features=tuple(cfeatures), + ) + ) + + threads.append( + ThreadFeatures( + address=taddr, + features=tuple(tfeatures), + calls=tuple(calls), + ) + ) + + process_features.append( + ProcessFeatures( + address=paddr, + name=pname, + features=tuple(pfeatures), + threads=tuple(threads), + ) + ) + + features = DynamicFeatures( + global_=global_features, + file=tuple(file_features), + processes=tuple(process_features), + ) # type: ignore + # Mypy is unable to recognise `global_` as a argument due to alias + + # workaround around mypy issue: https://github.com/python/mypy/issues/1424 + get_base_addr = getattr(extractor, "get_base_addr", None) + base_addr = get_base_addr() if get_base_addr else capa.features.address.NO_ADDRESS + + freeze = Freeze( + version=CURRENT_VERSION, + base_address=Address.from_capa(base_addr), + sample_hashes=extractor.get_sample_hashes(), + flavor="dynamic", + extractor=Extractor(name=extractor.__class__.__name__), + features=features, + ) # type: ignore + # Mypy is unable to recognise `base_address` as a argument due to alias + + return freeze.model_dump_json() + +def loads_static(s: str) -> StaticFeatureExtractor: + """deserialize a set of features (as a NullStaticFeatureExtractor) from a string.""" freeze = Freeze.model_validate_json(s) - if freeze.version != 2: + if freeze.version != CURRENT_VERSION: raise ValueError(f"unsupported freeze format version: {freeze.version}") - return null.NullFeatureExtractor( + assert freeze.flavor == "static" + assert isinstance(freeze.features, StaticFeatures) + + return null.NullStaticFeatureExtractor( base_address=freeze.base_address.to_capa(), + sample_hashes=freeze.sample_hashes, global_features=[f.feature.to_capa() for f in freeze.features.global_], file_features=[(f.address.to_capa(), f.feature.to_capa()) for f in freeze.features.file], functions={ @@ -349,10 +585,59 @@ def loads(s: str) -> capa.features.extractors.base_extractor.FeatureExtractor: ) +def loads_dynamic(s: str) -> DynamicFeatureExtractor: + """deserialize a set of features (as a NullDynamicFeatureExtractor) from a string.""" + freeze = Freeze.model_validate_json(s) + if freeze.version != CURRENT_VERSION: + raise ValueError(f"unsupported freeze format version: {freeze.version}") + + assert freeze.flavor == "dynamic" + assert isinstance(freeze.features, DynamicFeatures) + + return null.NullDynamicFeatureExtractor( + base_address=freeze.base_address.to_capa(), + sample_hashes=freeze.sample_hashes, + global_features=[f.feature.to_capa() for f in freeze.features.global_], + file_features=[(f.address.to_capa(), f.feature.to_capa()) for f in freeze.features.file], + processes={ + p.address.to_capa(): null.ProcessFeatures( + name=p.name, + features=[(fe.address.to_capa(), fe.feature.to_capa()) for fe in p.features], + threads={ + t.address.to_capa(): null.ThreadFeatures( + features=[(fe.address.to_capa(), fe.feature.to_capa()) for fe in t.features], + calls={ + c.address.to_capa(): null.CallFeatures( + name=c.name, + features=[(fe.address.to_capa(), fe.feature.to_capa()) for fe in c.features], + ) + for c in t.calls + }, + ) + for t in p.threads + }, + ) + for p in freeze.features.processes + }, + ) + + MAGIC = "capa0000".encode("ascii") -def dump(extractor: capa.features.extractors.base_extractor.FeatureExtractor) -> bytes: +def dumps(extractor: FeatureExtractor) -> str: + """serialize the given extractor to a string.""" + if isinstance(extractor, StaticFeatureExtractor): + doc = dumps_static(extractor) + elif isinstance(extractor, DynamicFeatureExtractor): + doc = dumps_dynamic(extractor) + else: + raise ValueError("Invalid feature extractor") + + return doc + + +def dump(extractor: FeatureExtractor) -> bytes: """serialize the given extractor to a byte array.""" return MAGIC + zlib.compress(dumps(extractor).encode("utf-8")) @@ -361,11 +646,28 @@ def is_freeze(buf: bytes) -> bool: return buf[: len(MAGIC)] == MAGIC -def load(buf: bytes) -> capa.features.extractors.base_extractor.FeatureExtractor: +def loads(s: str): + doc = json.loads(s) + + if doc["version"] != CURRENT_VERSION: + raise ValueError(f"unsupported freeze format version: {doc['version']}") + + if doc["flavor"] == "static": + return loads_static(s) + elif doc["flavor"] == "dynamic": + return loads_dynamic(s) + else: + raise ValueError(f"unsupported freeze format flavor: {doc['flavor']}") + + +def load(buf: bytes): """deserialize a set of features (as a NullFeatureExtractor) from a byte array.""" if not is_freeze(buf): raise ValueError("missing magic header") - return loads(zlib.decompress(buf[len(MAGIC) :]).decode("utf-8")) + + s = zlib.decompress(buf[len(MAGIC) :]).decode("utf-8") + + return loads(s) def main(argv=None): diff --git a/capa/ghidra/capa_ghidra.py b/capa/ghidra/capa_ghidra.py index 99beaffc4..70b98df56 100644 --- a/capa/ghidra/capa_ghidra.py +++ b/capa/ghidra/capa_ghidra.py @@ -19,6 +19,7 @@ import capa.rules import capa.ghidra.helpers import capa.render.default +import capa.capabilities.common import capa.features.extractors.ghidra.extractor logger = logging.getLogger("capa_ghidra") @@ -73,13 +74,13 @@ def run_headless(): meta = capa.ghidra.helpers.collect_metadata([rules_path]) extractor = capa.features.extractors.ghidra.extractor.GhidraFeatureExtractor() - capabilities, counts = capa.main.find_capabilities(rules, extractor, False) + capabilities, counts = capa.capabilities.common.find_capabilities(rules, extractor, False) meta.analysis.feature_counts = counts["feature_counts"] meta.analysis.library_functions = counts["library_functions"] meta.analysis.layout = capa.main.compute_layout(rules, extractor, capabilities) - if capa.main.has_file_limitation(rules, capabilities, is_standalone=True): + if capa.capabilities.common.has_file_limitation(rules, capabilities, is_standalone=True): logger.info("capa encountered warnings during analysis") if args.json: @@ -123,13 +124,13 @@ def run_ui(): meta = capa.ghidra.helpers.collect_metadata([rules_path]) extractor = capa.features.extractors.ghidra.extractor.GhidraFeatureExtractor() - capabilities, counts = capa.main.find_capabilities(rules, extractor, True) + capabilities, counts = capa.capabilities.common.find_capabilities(rules, extractor, True) meta.analysis.feature_counts = counts["feature_counts"] meta.analysis.library_functions = counts["library_functions"] meta.analysis.layout = capa.main.compute_layout(rules, extractor, capabilities) - if capa.main.has_file_limitation(rules, capabilities, is_standalone=False): + if capa.capabilities.common.has_file_limitation(rules, capabilities, is_standalone=False): logger.info("capa encountered warnings during analysis") if verbose == "vverbose": diff --git a/capa/ghidra/helpers.py b/capa/ghidra/helpers.py index b7debc163..b32c534a3 100644 --- a/capa/ghidra/helpers.py +++ b/capa/ghidra/helpers.py @@ -143,17 +143,18 @@ def collect_metadata(rules: List[Path]): sha256=sha256, path=currentProgram().getExecutablePath(), # type: ignore [name-defined] # noqa: F821 ), - analysis=rdoc.Analysis( + flavor=rdoc.Flavor.STATIC, + analysis=rdoc.StaticAnalysis( format=currentProgram().getExecutableFormat(), # type: ignore [name-defined] # noqa: F821 arch=arch, os=os, extractor="ghidra", rules=tuple(r.resolve().absolute().as_posix() for r in rules), base_address=capa.features.freeze.Address.from_capa(currentProgram().getImageBase().getOffset()), # type: ignore [name-defined] # noqa: F821 - layout=rdoc.Layout( + layout=rdoc.StaticLayout( functions=(), ), - feature_counts=rdoc.FeatureCounts(file=0, functions=()), + feature_counts=rdoc.StaticFeatureCounts(file=0, functions=()), library_functions=(), ), ) diff --git a/capa/helpers.py b/capa/helpers.py index 38f94b028..45fac5bfe 100644 --- a/capa/helpers.py +++ b/capa/helpers.py @@ -5,6 +5,7 @@ # Unless required by applicable law or agreed to in writing, software distributed under the License # is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and limitations under the License. +import json import inspect import logging import contextlib @@ -15,10 +16,11 @@ import tqdm from capa.exceptions import UnsupportedFormatError -from capa.features.common import FORMAT_PE, FORMAT_SC32, FORMAT_SC64, FORMAT_DOTNET, FORMAT_UNKNOWN, Format +from capa.features.common import FORMAT_PE, FORMAT_CAPE, FORMAT_SC32, FORMAT_SC64, FORMAT_DOTNET, FORMAT_UNKNOWN, Format EXTENSIONS_SHELLCODE_32 = ("sc32", "raw32") EXTENSIONS_SHELLCODE_64 = ("sc64", "raw64") +EXTENSIONS_DYNAMIC = ("json", "json_") EXTENSIONS_ELF = "elf_" logger = logging.getLogger("capa") @@ -57,12 +59,29 @@ def assert_never(value) -> NoReturn: assert False, f"Unhandled value: {value} ({type(value).__name__})" # noqa: B011 +def get_format_from_report(sample: Path) -> str: + report = json.load(sample.open(encoding="utf-8")) + + if "CAPE" in report: + return FORMAT_CAPE + + if "target" in report and "info" in report and "behavior" in report: + # CAPE report that's missing the "CAPE" key, + # which is not going to be much use, but its correct. + return FORMAT_CAPE + + return FORMAT_UNKNOWN + + def get_format_from_extension(sample: Path) -> str: + format_ = FORMAT_UNKNOWN if sample.name.endswith(EXTENSIONS_SHELLCODE_32): - return FORMAT_SC32 + format_ = FORMAT_SC32 elif sample.name.endswith(EXTENSIONS_SHELLCODE_64): - return FORMAT_SC64 - return FORMAT_UNKNOWN + format_ = FORMAT_SC64 + elif sample.name.endswith(EXTENSIONS_DYNAMIC): + format_ = get_format_from_report(sample) + return format_ def get_auto_format(path: Path) -> str: @@ -128,12 +147,29 @@ def new_print(*args, **kwargs): def log_unsupported_format_error(): logger.error("-" * 80) - logger.error(" Input file does not appear to be a PE or ELF file.") + logger.error(" Input file does not appear to be a supported file.") + logger.error(" ") + logger.error(" See all supported file formats via capa's help output (-h).") + logger.error(" If you don't know the input file type, you can try using the `file` utility to guess it.") + logger.error("-" * 80) + + +def log_unsupported_cape_report_error(error: str): + logger.error("-" * 80) + logger.error("Input file is not a valid CAPE report: %s", error) logger.error(" ") + logger.error(" capa currently only supports analyzing standard CAPE reports in JSON format.") logger.error( - " capa currently only supports analyzing PE and ELF files (or shellcode, when using --format sc32|sc64)." + " Please make sure your report file is in the standard format and contains both the static and dynamic sections." ) - logger.error(" If you don't know the input file type, you can try using the `file` utility to guess it.") + logger.error("-" * 80) + + +def log_empty_cape_report_error(error: str): + logger.error("-" * 80) + logger.error(" CAPE report is empty or only contains little useful data: %s", error) + logger.error(" ") + logger.error(" Please make sure the sandbox run captures useful behaviour of your sample.") logger.error("-" * 80) diff --git a/capa/ida/helpers.py b/capa/ida/helpers.py index 346421b08..90ce525eb 100644 --- a/capa/ida/helpers.py +++ b/capa/ida/helpers.py @@ -152,14 +152,15 @@ def collect_metadata(rules: List[Path]): sha256=sha256, path=idaapi.get_input_file_path(), ), - analysis=rdoc.Analysis( + flavor=rdoc.Flavor.STATIC, + analysis=rdoc.StaticAnalysis( format=idaapi.get_file_type_name(), arch=arch, os=os, extractor="ida", rules=tuple(r.resolve().absolute().as_posix() for r in rules), base_address=capa.features.freeze.Address.from_capa(idaapi.get_imagebase()), - layout=rdoc.Layout( + layout=rdoc.StaticLayout( functions=(), # this is updated after capabilities have been collected. # will look like: @@ -167,7 +168,7 @@ def collect_metadata(rules: List[Path]): # "functions": { 0x401000: { "matched_basic_blocks": [ 0x401000, 0x401005, ... ] }, ... } ), # ignore these for now - not used by IDA plugin. - feature_counts=rdoc.FeatureCounts(file=0, functions=()), + feature_counts=rdoc.StaticFeatureCounts(file=0, functions=()), library_functions=(), ), ) diff --git a/capa/ida/plugin/form.py b/capa/ida/plugin/form.py index a079f1d91..4e1bd572a 100644 --- a/capa/ida/plugin/form.py +++ b/capa/ida/plugin/form.py @@ -25,6 +25,7 @@ import capa.ida.helpers import capa.render.json import capa.features.common +import capa.capabilities.common import capa.render.result_document import capa.features.extractors.ida.extractor from capa.rules import Rule @@ -768,7 +769,7 @@ def slot_progress_feature_extraction(text): try: meta = capa.ida.helpers.collect_metadata([Path(settings.user[CAPA_SETTINGS_RULE_PATH])]) - capabilities, counts = capa.main.find_capabilities( + capabilities, counts = capa.capabilities.common.find_capabilities( ruleset, self.feature_extractor, disable_progress=True ) @@ -810,7 +811,7 @@ def slot_progress_feature_extraction(text): capa.ida.helpers.inform_user_ida_ui("capa encountered file type warnings during analysis") - if capa.main.has_file_limitation(ruleset, capabilities, is_standalone=False): + if capa.capabilities.common.has_file_limitation(ruleset, capabilities, is_standalone=False): capa.ida.helpers.inform_user_ida_ui("capa encountered file limitation warnings during analysis") except Exception as e: logger.exception("Failed to check for file limitations (error: %s)", e) @@ -1192,10 +1193,13 @@ def update_rule_status(self, rule_text: str): return is_match: bool = False - if self.rulegen_current_function is not None and rule.scope in ( - capa.rules.Scope.FUNCTION, - capa.rules.Scope.BASIC_BLOCK, - capa.rules.Scope.INSTRUCTION, + if self.rulegen_current_function is not None and any( + s in rule.scopes + for s in ( + capa.rules.Scope.FUNCTION, + capa.rules.Scope.BASIC_BLOCK, + capa.rules.Scope.INSTRUCTION, + ) ): try: _, func_matches, bb_matches, insn_matches = self.rulegen_feature_cache.find_code_capabilities( @@ -1205,13 +1209,13 @@ def update_rule_status(self, rule_text: str): self.set_rulegen_status(f"Failed to create function rule matches from rule set ({e})") return - if rule.scope == capa.rules.Scope.FUNCTION and rule.name in func_matches: + if capa.rules.Scope.FUNCTION in rule.scopes and rule.name in func_matches: is_match = True - elif rule.scope == capa.rules.Scope.BASIC_BLOCK and rule.name in bb_matches: + elif capa.rules.Scope.BASIC_BLOCK in rule.scopes and rule.name in bb_matches: is_match = True - elif rule.scope == capa.rules.Scope.INSTRUCTION and rule.name in insn_matches: + elif capa.rules.Scope.INSTRUCTION in rule.scopes and rule.name in insn_matches: is_match = True - elif rule.scope == capa.rules.Scope.FILE: + elif capa.rules.Scope.FILE in rule.scopes: try: _, file_matches = self.rulegen_feature_cache.find_file_capabilities(ruleset) except Exception as e: diff --git a/capa/ida/plugin/model.py b/capa/ida/plugin/model.py index 47a6e7f75..dad4d1e69 100644 --- a/capa/ida/plugin/model.py +++ b/capa/ida/plugin/model.py @@ -500,16 +500,16 @@ def render_capa_doc_by_program(self, doc: rd.ResultDocument): location = location_.to_capa() parent2: CapaExplorerDataItem - if rule.meta.scope == capa.rules.FILE_SCOPE: + if capa.rules.Scope.FILE in rule.meta.scopes: parent2 = parent - elif rule.meta.scope == capa.rules.FUNCTION_SCOPE: + elif capa.rules.Scope.FUNCTION in rule.meta.scopes: parent2 = CapaExplorerFunctionItem(parent, location) - elif rule.meta.scope == capa.rules.BASIC_BLOCK_SCOPE: + elif capa.rules.Scope.BASIC_BLOCK in rule.meta.scopes: parent2 = CapaExplorerBlockItem(parent, location) - elif rule.meta.scope == capa.rules.INSTRUCTION_SCOPE: + elif capa.rules.Scope.INSTRUCTION in rule.meta.scopes: parent2 = CapaExplorerInstructionItem(parent, location) else: - raise RuntimeError("unexpected rule scope: " + str(rule.meta.scope)) + raise RuntimeError("unexpected rule scope: " + str(rule.meta.scopes.static)) self.render_capa_doc_match(parent2, match, doc) diff --git a/capa/main.py b/capa/main.py index ae8421560..d94275ffe 100644 --- a/capa/main.py +++ b/capa/main.py @@ -11,23 +11,20 @@ import io import os import sys +import json import time -import hashlib import logging import argparse import datetime import textwrap -import itertools import contextlib -import collections -from typing import Any, Dict, List, Tuple, Callable, Optional +from typing import Any, Set, Dict, List, Callable, Optional from pathlib import Path import halo -import tqdm import colorama -import tqdm.contrib.logging from pefile import PEFormatError +from typing_extensions import assert_never from elftools.common.exceptions import ELFError import capa.perf @@ -51,18 +48,25 @@ import capa.features.extractors.elffile import capa.features.extractors.dotnetfile import capa.features.extractors.base_extractor -from capa.rules import Rule, Scope, RuleSet -from capa.engine import FeatureSet, MatchResults +import capa.features.extractors.cape.extractor +from capa.rules import Rule, RuleSet +from capa.engine import MatchResults from capa.helpers import ( - get_format, get_file_taste, get_auto_format, log_unsupported_os_error, - redirecting_print_to_tqdm, log_unsupported_arch_error, + log_empty_cape_report_error, log_unsupported_format_error, + log_unsupported_cape_report_error, +) +from capa.exceptions import ( + EmptyReportError, + UnsupportedOSError, + UnsupportedArchError, + UnsupportedFormatError, + UnsupportedRuntimeError, ) -from capa.exceptions import UnsupportedOSError, UnsupportedArchError, UnsupportedFormatError, UnsupportedRuntimeError from capa.features.common import ( OS_AUTO, OS_LINUX, @@ -71,14 +75,21 @@ FORMAT_ELF, OS_WINDOWS, FORMAT_AUTO, + FORMAT_CAPE, FORMAT_SC32, FORMAT_SC64, FORMAT_DOTNET, FORMAT_FREEZE, FORMAT_RESULT, ) -from capa.features.address import NO_ADDRESS, Address -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle, FeatureExtractor +from capa.features.address import Address +from capa.capabilities.common import find_capabilities, has_file_limitation, find_file_capabilities +from capa.features.extractors.base_extractor import ( + SampleHashes, + FeatureExtractor, + StaticFeatureExtractor, + DynamicFeatureExtractor, +) RULES_PATH_DEFAULT_STRING = "(embedded rules)" SIGNATURES_PATH_DEFAULT_STRING = "(embedded signatures)" @@ -98,6 +109,8 @@ E_INVALID_FILE_OS = 18 E_UNSUPPORTED_IDA_VERSION = 19 E_UNSUPPORTED_GHIDRA_VERSION = 20 +E_MISSING_CAPE_STATIC_ANALYSIS = 21 +E_MISSING_CAPE_DYNAMIC_ANALYSIS = 22 logger = logging.getLogger("capa") @@ -120,267 +133,6 @@ def set_vivisect_log_level(level): logging.getLogger("Elf").setLevel(level) -def find_instruction_capabilities( - ruleset: RuleSet, extractor: FeatureExtractor, f: FunctionHandle, bb: BBHandle, insn: InsnHandle -) -> Tuple[FeatureSet, MatchResults]: - """ - find matches for the given rules for the given instruction. - - returns: tuple containing (features for instruction, match results for instruction) - """ - # all features found for the instruction. - features = collections.defaultdict(set) # type: FeatureSet - - for feature, addr in itertools.chain( - extractor.extract_insn_features(f, bb, insn), extractor.extract_global_features() - ): - features[feature].add(addr) - - # matches found at this instruction. - _, matches = ruleset.match(Scope.INSTRUCTION, features, insn.address) - - for rule_name, res in matches.items(): - rule = ruleset[rule_name] - for addr, _ in res: - capa.engine.index_rule_matches(features, rule, [addr]) - - return features, matches - - -def find_basic_block_capabilities( - ruleset: RuleSet, extractor: FeatureExtractor, f: FunctionHandle, bb: BBHandle -) -> Tuple[FeatureSet, MatchResults, MatchResults]: - """ - find matches for the given rules within the given basic block. - - returns: tuple containing (features for basic block, match results for basic block, match results for instructions) - """ - # all features found within this basic block, - # includes features found within instructions. - features = collections.defaultdict(set) # type: FeatureSet - - # matches found at the instruction scope. - # might be found at different instructions, thats ok. - insn_matches = collections.defaultdict(list) # type: MatchResults - - for insn in extractor.get_instructions(f, bb): - ifeatures, imatches = find_instruction_capabilities(ruleset, extractor, f, bb, insn) - for feature, vas in ifeatures.items(): - features[feature].update(vas) - - for rule_name, res in imatches.items(): - insn_matches[rule_name].extend(res) - - for feature, va in itertools.chain( - extractor.extract_basic_block_features(f, bb), extractor.extract_global_features() - ): - features[feature].add(va) - - # matches found within this basic block. - _, matches = ruleset.match(Scope.BASIC_BLOCK, features, bb.address) - - for rule_name, res in matches.items(): - rule = ruleset[rule_name] - for va, _ in res: - capa.engine.index_rule_matches(features, rule, [va]) - - return features, matches, insn_matches - - -def find_code_capabilities( - ruleset: RuleSet, extractor: FeatureExtractor, fh: FunctionHandle -) -> Tuple[MatchResults, MatchResults, MatchResults, int]: - """ - find matches for the given rules within the given function. - - returns: tuple containing (match results for function, match results for basic blocks, match results for instructions, number of features) - """ - # all features found within this function, - # includes features found within basic blocks (and instructions). - function_features = collections.defaultdict(set) # type: FeatureSet - - # matches found at the basic block scope. - # might be found at different basic blocks, thats ok. - bb_matches = collections.defaultdict(list) # type: MatchResults - - # matches found at the instruction scope. - # might be found at different instructions, thats ok. - insn_matches = collections.defaultdict(list) # type: MatchResults - - for bb in extractor.get_basic_blocks(fh): - features, bmatches, imatches = find_basic_block_capabilities(ruleset, extractor, fh, bb) - for feature, vas in features.items(): - function_features[feature].update(vas) - - for rule_name, res in bmatches.items(): - bb_matches[rule_name].extend(res) - - for rule_name, res in imatches.items(): - insn_matches[rule_name].extend(res) - - for feature, va in itertools.chain(extractor.extract_function_features(fh), extractor.extract_global_features()): - function_features[feature].add(va) - - _, function_matches = ruleset.match(Scope.FUNCTION, function_features, fh.address) - return function_matches, bb_matches, insn_matches, len(function_features) - - -def find_file_capabilities(ruleset: RuleSet, extractor: FeatureExtractor, function_features: FeatureSet): - file_features = collections.defaultdict(set) # type: FeatureSet - - for feature, va in itertools.chain(extractor.extract_file_features(), extractor.extract_global_features()): - # not all file features may have virtual addresses. - # if not, then at least ensure the feature shows up in the index. - # the set of addresses will still be empty. - if va: - file_features[feature].add(va) - else: - if feature not in file_features: - file_features[feature] = set() - - logger.debug("analyzed file and extracted %d features", len(file_features)) - - file_features.update(function_features) - - _, matches = ruleset.match(Scope.FILE, file_features, NO_ADDRESS) - return matches, len(file_features) - - -def find_capabilities(ruleset: RuleSet, extractor: FeatureExtractor, disable_progress=None) -> Tuple[MatchResults, Any]: - all_function_matches = collections.defaultdict(list) # type: MatchResults - all_bb_matches = collections.defaultdict(list) # type: MatchResults - all_insn_matches = collections.defaultdict(list) # type: MatchResults - - feature_counts = rdoc.FeatureCounts(file=0, functions=()) - library_functions: Tuple[rdoc.LibraryFunction, ...] = () - - with redirecting_print_to_tqdm(disable_progress): - with tqdm.contrib.logging.logging_redirect_tqdm(): - pbar = tqdm.tqdm - if capa.helpers.is_runtime_ghidra(): - # Ghidrathon interpreter cannot properly handle - # the TMonitor thread that is created via a monitor_interval - # > 0 - pbar.monitor_interval = 0 - if disable_progress: - # do not use tqdm to avoid unnecessary side effects when caller intends - # to disable progress completely - def pbar(s, *args, **kwargs): - return s - - functions = list(extractor.get_functions()) - n_funcs = len(functions) - - pb = pbar(functions, desc="matching", unit=" functions", postfix="skipped 0 library functions", leave=False) - for f in pb: - t0 = time.time() - if extractor.is_library_function(f.address): - function_name = extractor.get_function_name(f.address) - logger.debug("skipping library function 0x%x (%s)", f.address, function_name) - library_functions += ( - rdoc.LibraryFunction(address=frz.Address.from_capa(f.address), name=function_name), - ) - n_libs = len(library_functions) - percentage = round(100 * (n_libs / n_funcs)) - if isinstance(pb, tqdm.tqdm): - pb.set_postfix_str(f"skipped {n_libs} library functions ({percentage}%)") - continue - - function_matches, bb_matches, insn_matches, feature_count = find_code_capabilities( - ruleset, extractor, f - ) - feature_counts.functions += ( - rdoc.FunctionFeatureCount(address=frz.Address.from_capa(f.address), count=feature_count), - ) - t1 = time.time() - - match_count = sum(len(res) for res in function_matches.values()) - match_count += sum(len(res) for res in bb_matches.values()) - match_count += sum(len(res) for res in insn_matches.values()) - logger.debug( - "analyzed function 0x%x and extracted %d features, %d matches in %0.02fs", - f.address, - feature_count, - match_count, - t1 - t0, - ) - - for rule_name, res in function_matches.items(): - all_function_matches[rule_name].extend(res) - for rule_name, res in bb_matches.items(): - all_bb_matches[rule_name].extend(res) - for rule_name, res in insn_matches.items(): - all_insn_matches[rule_name].extend(res) - - # collection of features that captures the rule matches within function, BB, and instruction scopes. - # mapping from feature (matched rule) to set of addresses at which it matched. - function_and_lower_features: FeatureSet = collections.defaultdict(set) - for rule_name, results in itertools.chain( - all_function_matches.items(), all_bb_matches.items(), all_insn_matches.items() - ): - locations = {p[0] for p in results} - rule = ruleset[rule_name] - capa.engine.index_rule_matches(function_and_lower_features, rule, locations) - - all_file_matches, feature_count = find_file_capabilities(ruleset, extractor, function_and_lower_features) - feature_counts.file = feature_count - - matches = dict( - itertools.chain( - # each rule exists in exactly one scope, - # so there won't be any overlap among these following MatchResults, - # and we can merge the dictionaries naively. - all_insn_matches.items(), - all_bb_matches.items(), - all_function_matches.items(), - all_file_matches.items(), - ) - ) - - meta = { - "feature_counts": feature_counts, - "library_functions": library_functions, - } - - return matches, meta - - -def has_rule_with_namespace(rules: RuleSet, capabilities: MatchResults, namespace: str) -> bool: - return any( - rules.rules[rule_name].meta.get("namespace", "").startswith(namespace) for rule_name in capabilities.keys() - ) - - -def is_internal_rule(rule: Rule) -> bool: - return rule.meta.get("namespace", "").startswith("internal/") - - -def is_file_limitation_rule(rule: Rule) -> bool: - return rule.meta.get("namespace", "") == "internal/limitation/file" - - -def has_file_limitation(rules: RuleSet, capabilities: MatchResults, is_standalone=True) -> bool: - file_limitation_rules = list(filter(is_file_limitation_rule, rules.rules.values())) - - for file_limitation_rule in file_limitation_rules: - if file_limitation_rule.name not in capabilities: - continue - - logger.warning("-" * 80) - for line in file_limitation_rule.meta.get("description", "").split("\n"): - logger.warning(" %s", line) - logger.warning(" Identified via rule: %s", file_limitation_rule.name) - if is_standalone: - logger.warning(" ") - logger.warning(" Use -v or -vv if you really want to see the capabilities identified by capa.") - logger.warning("-" * 80) - - # bail on first file limitation - return True - - return False - - def is_supported_format(sample: Path) -> bool: """ Return if this is a supported file based on magic header values @@ -532,7 +284,8 @@ def get_extractor( UnsupportedArchError UnsupportedOSError """ - if format_ not in (FORMAT_SC32, FORMAT_SC64): + + if format_ not in (FORMAT_SC32, FORMAT_SC64, FORMAT_CAPE): if not is_supported_format(path): raise UnsupportedFormatError() @@ -542,7 +295,13 @@ def get_extractor( if os_ == OS_AUTO and not is_supported_os(path): raise UnsupportedOSError() - if format_ == FORMAT_DOTNET: + if format_ == FORMAT_CAPE: + import capa.features.extractors.cape.extractor + + report = json.load(Path(path).open(encoding="utf-8")) + return capa.features.extractors.cape.extractor.CapeExtractor.from_report(report) + + elif format_ == FORMAT_DOTNET: import capa.features.extractors.dnfile.extractor return capa.features.extractors.dnfile.extractor.DnfileFeatureExtractor(path) @@ -612,9 +371,13 @@ def get_file_extractors(sample: Path, format_: str) -> List[FeatureExtractor]: file_extractors.append(capa.features.extractors.pefile.PefileFeatureExtractor(sample)) file_extractors.append(capa.features.extractors.dnfile_.DnfileFeatureExtractor(sample)) - elif format_ == capa.features.extractors.common.FORMAT_ELF: + elif format_ == capa.features.common.FORMAT_ELF: file_extractors.append(capa.features.extractors.elffile.ElfFeatureExtractor(sample)) + elif format_ == FORMAT_CAPE: + report = json.load(Path(sample).open(encoding="utf-8")) + file_extractors.append(capa.features.extractors.cape.extractor.CapeExtractor.from_report(report)) + return file_extractors @@ -696,7 +459,7 @@ def get_rules( if ruleset is not None: return ruleset - rules = [] # type: List[Rule] + rules: List[Rule] = [] total_rule_count = len(rule_file_paths) for i, (path, content) in enumerate(zip(rule_file_paths, rule_contents)): @@ -711,7 +474,7 @@ def get_rules( rule.meta["capa/nursery"] = is_nursery_rule_path(path) rules.append(rule) - logger.debug("loaded rule: '%s' with scope: %s", rule.name, rule.scope) + logger.debug("loaded rule: '%s' with scope: %s", rule.name, rule.scopes) ruleset = capa.rules.RuleSet(rules) @@ -746,60 +509,177 @@ def get_signatures(sigs_path: Path) -> List[Path]: return paths +def get_sample_analysis(format_, arch, os_, extractor, rules_path, counts): + if isinstance(extractor, StaticFeatureExtractor): + return rdoc.StaticAnalysis( + format=format_, + arch=arch, + os=os_, + extractor=extractor.__class__.__name__, + rules=tuple(rules_path), + base_address=frz.Address.from_capa(extractor.get_base_address()), + layout=rdoc.StaticLayout( + functions=(), + # this is updated after capabilities have been collected. + # will look like: + # + # "functions": { 0x401000: { "matched_basic_blocks": [ 0x401000, 0x401005, ... ] }, ... } + ), + feature_counts=counts["feature_counts"], + library_functions=counts["library_functions"], + ) + elif isinstance(extractor, DynamicFeatureExtractor): + return rdoc.DynamicAnalysis( + format=format_, + arch=arch, + os=os_, + extractor=extractor.__class__.__name__, + rules=tuple(rules_path), + layout=rdoc.DynamicLayout( + processes=(), + ), + feature_counts=counts["feature_counts"], + ) + else: + raise ValueError("invalid extractor type") + + def collect_metadata( argv: List[str], sample_path: Path, format_: str, os_: str, rules_path: List[Path], - extractor: capa.features.extractors.base_extractor.FeatureExtractor, + extractor: FeatureExtractor, + counts: dict, ) -> rdoc.Metadata: - md5 = hashlib.md5() - sha1 = hashlib.sha1() - sha256 = hashlib.sha256() - - buf = sample_path.read_bytes() - - md5.update(buf) - sha1.update(buf) - sha256.update(buf) + # if it's a binary sample we hash it, if it's a report + # we fetch the hashes from the report + sample_hashes: SampleHashes = extractor.get_sample_hashes() + md5, sha1, sha256 = sample_hashes.md5, sample_hashes.sha1, sample_hashes.sha256 + + global_feats = list(extractor.extract_global_features()) + extractor_format = [f.value for (f, _) in global_feats if isinstance(f, capa.features.common.Format)] + extractor_arch = [f.value for (f, _) in global_feats if isinstance(f, capa.features.common.Arch)] + extractor_os = [f.value for (f, _) in global_feats if isinstance(f, capa.features.common.OS)] + + format_ = str(extractor_format[0]) if extractor_format else "unknown" if format_ == FORMAT_AUTO else format_ + arch = str(extractor_arch[0]) if extractor_arch else "unknown" + os_ = str(extractor_os[0]) if extractor_os else "unknown" if os_ == OS_AUTO else os_ + + if isinstance(extractor, StaticFeatureExtractor): + meta_class: type = rdoc.StaticMetadata + elif isinstance(extractor, DynamicFeatureExtractor): + meta_class = rdoc.DynamicMetadata + else: + assert_never(extractor) rules = tuple(r.resolve().absolute().as_posix() for r in rules_path) - format_ = get_format(sample_path) if format_ == FORMAT_AUTO else format_ - arch = get_arch(sample_path) - os_ = get_os(sample_path) if os_ == OS_AUTO else os_ - return rdoc.Metadata( + return meta_class( timestamp=datetime.datetime.now(), version=capa.version.__version__, argv=tuple(argv) if argv else None, sample=rdoc.Sample( - md5=md5.hexdigest(), - sha1=sha1.hexdigest(), - sha256=sha256.hexdigest(), - path=sample_path.resolve().absolute().as_posix(), + md5=md5, + sha1=sha1, + sha256=sha256, + path=Path(sample_path).resolve().as_posix(), ), - analysis=rdoc.Analysis( - format=format_, - arch=arch, - os=os_, - extractor=extractor.__class__.__name__, - rules=rules, - base_address=frz.Address.from_capa(extractor.get_base_address()), - layout=rdoc.Layout( - functions=(), - # this is updated after capabilities have been collected. - # will look like: - # - # "functions": { 0x401000: { "matched_basic_blocks": [ 0x401000, 0x401005, ... ] }, ... } - ), - feature_counts=rdoc.FeatureCounts(file=0, functions=()), - library_functions=(), + analysis=get_sample_analysis( + format_, + arch, + os_, + extractor, + rules, + counts, ), ) -def compute_layout(rules, extractor, capabilities) -> rdoc.Layout: +def compute_dynamic_layout(rules, extractor: DynamicFeatureExtractor, capabilities: MatchResults) -> rdoc.DynamicLayout: + """ + compute a metadata structure that links threads + to the processes in which they're found. + + only collect the threads at which some rule matched. + otherwise, we may pollute the json document with + a large amount of un-referenced data. + """ + assert isinstance(extractor, DynamicFeatureExtractor) + + matched_calls: Set[Address] = set() + + def result_rec(result: capa.features.common.Result): + for loc in result.locations: + if isinstance(loc, capa.features.address.DynamicCallAddress): + matched_calls.add(loc) + for child in result.children: + result_rec(child) + + for matches in capabilities.values(): + for _, result in matches: + result_rec(result) + + names_by_process: Dict[Address, str] = {} + names_by_call: Dict[Address, str] = {} + + matched_processes: Set[Address] = set() + matched_threads: Set[Address] = set() + + threads_by_process: Dict[Address, List[Address]] = {} + calls_by_thread: Dict[Address, List[Address]] = {} + + for p in extractor.get_processes(): + threads_by_process[p.address] = [] + + for t in extractor.get_threads(p): + calls_by_thread[t.address] = [] + + for c in extractor.get_calls(p, t): + if c.address in matched_calls: + names_by_call[c.address] = extractor.get_call_name(p, t, c) + calls_by_thread[t.address].append(c.address) + + if calls_by_thread[t.address]: + matched_threads.add(t.address) + threads_by_process[p.address].append(t.address) + + if threads_by_process[p.address]: + matched_processes.add(p.address) + names_by_process[p.address] = extractor.get_process_name(p) + + layout = rdoc.DynamicLayout( + processes=tuple( + rdoc.ProcessLayout( + address=frz.Address.from_capa(p), + name=names_by_process[p], + matched_threads=tuple( + rdoc.ThreadLayout( + address=frz.Address.from_capa(t), + matched_calls=tuple( + rdoc.CallLayout( + address=frz.Address.from_capa(c), + name=names_by_call[c], + ) + for c in calls_by_thread[t] + if c in matched_calls + ), + ) + for t in threads + if t in matched_threads + ) # this object is open to extension in the future, + # such as with the function name, etc. + ) + for p, threads in threads_by_process.items() + if p in matched_processes + ) + ) + + return layout + + +def compute_static_layout(rules, extractor: StaticFeatureExtractor, capabilities) -> rdoc.StaticLayout: """ compute a metadata structure that links basic blocks to the functions in which they're found. @@ -819,12 +699,12 @@ def compute_layout(rules, extractor, capabilities) -> rdoc.Layout: matched_bbs = set() for rule_name, matches in capabilities.items(): rule = rules[rule_name] - if rule.meta.get("scope") == capa.rules.BASIC_BLOCK_SCOPE: + if capa.rules.Scope.BASIC_BLOCK in rule.scopes: for addr, _ in matches: assert addr in functions_by_bb matched_bbs.add(addr) - layout = rdoc.Layout( + layout = rdoc.StaticLayout( functions=tuple( rdoc.FunctionLayout( address=frz.Address.from_capa(f), @@ -841,6 +721,15 @@ def compute_layout(rules, extractor, capabilities) -> rdoc.Layout: return layout +def compute_layout(rules, extractor, capabilities) -> rdoc.Layout: + if isinstance(extractor, StaticFeatureExtractor): + return compute_static_layout(rules, extractor, capabilities) + elif isinstance(extractor, DynamicFeatureExtractor): + return compute_dynamic_layout(rules, extractor, capabilities) + else: + raise ValueError("extractor must be either a static or dynamic extracotr") + + def install_common_args(parser, wanted=None): """ register a common set of command line arguments for re-use by main & scripts. @@ -909,6 +798,7 @@ def install_common_args(parser, wanted=None): (FORMAT_ELF, "Executable and Linkable Format"), (FORMAT_SC32, "32-bit shellcode"), (FORMAT_SC64, "64-bit shellcode"), + (FORMAT_CAPE, "CAPE sandbox report"), (FORMAT_FREEZE, "features previously frozen by capa"), ] format_help = ", ".join([f"{f[0]}: {f[1]}" for f in formats]) @@ -1165,7 +1055,7 @@ def main(argv: Optional[List[str]] = None): # during the load of the RuleSet, we extract subscope statements into their own rules # that are subsequently `match`ed upon. this inflates the total rule count. # so, filter out the subscope rules when reporting total number of loaded rules. - len(list(filter(lambda r: not r.is_subscope_rule(), rules.rules.values()))), + len(list(filter(lambda r: not (r.is_subscope_rule()), rules.rules.values()))), ) if args.tag: rules = rules.filter_rules_by_meta(args.tag) @@ -1204,8 +1094,24 @@ def main(argv: Optional[List[str]] = None): except (ELFError, OverflowError) as e: logger.error("Input file '%s' is not a valid ELF file: %s", args.sample, str(e)) return E_CORRUPT_FILE + except UnsupportedFormatError as e: + if format_ == FORMAT_CAPE: + log_unsupported_cape_report_error(str(e)) + else: + log_unsupported_format_error() + return E_INVALID_FILE_TYPE + except EmptyReportError as e: + if format_ == FORMAT_CAPE: + log_empty_cape_report_error(str(e)) + else: + log_unsupported_format_error() + found_file_limitation = False for file_extractor in file_extractors: + if isinstance(file_extractor, DynamicFeatureExtractor): + # Dynamic feature extractors can handle packed samples + continue + try: pure_file_capabilities, _ = find_file_capabilities(rules, file_extractor, {}) except PEFormatError as e: @@ -1217,7 +1123,8 @@ def main(argv: Optional[List[str]] = None): # file limitations that rely on non-file scope won't be detected here. # nor on FunctionName features, because pefile doesn't support this. - if has_file_limitation(rules, pure_file_capabilities): + found_file_limitation = has_file_limitation(rules, pure_file_capabilities) + if found_file_limitation: # bail if capa encountered file limitation e.g. a packed binary # do show the output in verbose mode, though. if not (args.verbose or args.vverbose or args.json): @@ -1239,7 +1146,7 @@ def main(argv: Optional[List[str]] = None): if format_ == FORMAT_FREEZE: # freeze format deserializes directly into an extractor - extractor = frz.load(Path(args.sample).read_bytes()) + extractor: FeatureExtractor = frz.load(Path(args.sample).read_bytes()) else: # all other formats we must create an extractor, # such as viv, binary ninja, etc. workspaces @@ -1257,6 +1164,9 @@ def main(argv: Optional[List[str]] = None): should_save_workspace = os.environ.get("CAPA_SAVE_WORKSPACE") not in ("0", "no", "NO", "n", None) + # TODO(mr-tz): this should be wrapped and refactored as it's tedious to update everywhere + # see same code and show-features above examples + # https://github.com/mandiant/capa/issues/1813 try: extractor = get_extractor( args.sample, @@ -1267,8 +1177,11 @@ def main(argv: Optional[List[str]] = None): should_save_workspace, disable_progress=args.quiet or args.debug, ) - except UnsupportedFormatError: - log_unsupported_format_error() + except UnsupportedFormatError as e: + if format_ == FORMAT_CAPE: + log_unsupported_cape_report_error(str(e)) + else: + log_unsupported_format_error() return E_INVALID_FILE_TYPE except UnsupportedArchError: log_unsupported_arch_error() @@ -1277,16 +1190,13 @@ def main(argv: Optional[List[str]] = None): log_unsupported_os_error() return E_INVALID_FILE_OS - meta = collect_metadata(argv, args.sample, args.format, args.os, args.rules, extractor) - capabilities, counts = find_capabilities(rules, extractor, disable_progress=args.quiet) - meta.analysis.feature_counts = counts["feature_counts"] - meta.analysis.library_functions = counts["library_functions"] + meta = collect_metadata(argv, args.sample, args.format, args.os, args.rules, extractor, counts) meta.analysis.layout = compute_layout(rules, extractor, capabilities) - if has_file_limitation(rules, capabilities): - # bail if capa encountered file limitation e.g. a packed binary + if isinstance(extractor, StaticFeatureExtractor) and found_file_limitation: + # bail if capa's static feature extractor encountered file limitation e.g. a packed binary # do show the output in verbose mode, though. if not (args.verbose or args.vverbose or args.json): return E_FILE_LIMITATION diff --git a/capa/render/default.py b/capa/render/default.py index 79567e4b2..1af0d27ca 100644 --- a/capa/render/default.py +++ b/capa/render/default.py @@ -33,6 +33,7 @@ def render_meta(doc: rd.ResultDocument, ostream: StringIO): (width("md5", 22), width(doc.meta.sample.md5, 82)), ("sha1", doc.meta.sample.sha1), ("sha256", doc.meta.sample.sha256), + ("analysis", doc.meta.flavor), ("os", doc.meta.analysis.os), ("format", doc.meta.analysis.format), ("arch", doc.meta.analysis.arch), diff --git a/capa/render/proto/__init__.py b/capa/render/proto/__init__.py index 03aed65c0..ed4c690e1 100644 --- a/capa/render/proto/__init__.py +++ b/capa/render/proto/__init__.py @@ -38,16 +38,6 @@ from capa.features.freeze import AddressType -def dict_tuple_to_list_values(d: Dict) -> Dict: - o = {} - for k, v in d.items(): - if isinstance(v, tuple): - o[k] = list(v) - else: - o[k] = v - return o - - def int_to_pb2(v: int) -> capa_pb2.Integer: if v < -2_147_483_648: raise ValueError(f"value underflow: {v}") @@ -100,6 +90,51 @@ def addr_to_pb2(addr: frz.Address) -> capa_pb2.Address: token_offset=capa_pb2.Token_Offset(token=int_to_pb2(token), offset=offset), ) + elif addr.type is AddressType.PROCESS: + assert isinstance(addr.value, tuple) + ppid, pid = addr.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + return capa_pb2.Address( + type=capa_pb2.AddressType.ADDRESSTYPE_PROCESS, + ppid_pid=capa_pb2.Ppid_Pid( + ppid=int_to_pb2(ppid), + pid=int_to_pb2(pid), + ), + ) + + elif addr.type is AddressType.THREAD: + assert isinstance(addr.value, tuple) + ppid, pid, tid = addr.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + assert isinstance(tid, int) + return capa_pb2.Address( + type=capa_pb2.AddressType.ADDRESSTYPE_THREAD, + ppid_pid_tid=capa_pb2.Ppid_Pid_Tid( + ppid=int_to_pb2(ppid), + pid=int_to_pb2(pid), + tid=int_to_pb2(tid), + ), + ) + + elif addr.type is AddressType.CALL: + assert isinstance(addr.value, tuple) + ppid, pid, tid, id_ = addr.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + assert isinstance(tid, int) + assert isinstance(id_, int) + return capa_pb2.Address( + type=capa_pb2.AddressType.ADDRESSTYPE_CALL, + ppid_pid_tid_id=capa_pb2.Ppid_Pid_Tid_Id( + ppid=int_to_pb2(ppid), + pid=int_to_pb2(pid), + tid=int_to_pb2(tid), + id=int_to_pb2(id_), + ), + ) + elif addr.type is AddressType.NO_ADDRESS: # value == None, so only set type return capa_pb2.Address(type=capa_pb2.AddressType.ADDRESSTYPE_NO_ADDRESS) @@ -117,49 +152,129 @@ def scope_to_pb2(scope: capa.rules.Scope) -> capa_pb2.Scope.ValueType: return capa_pb2.Scope.SCOPE_BASIC_BLOCK elif scope == capa.rules.Scope.INSTRUCTION: return capa_pb2.Scope.SCOPE_INSTRUCTION + elif scope == capa.rules.Scope.PROCESS: + return capa_pb2.Scope.SCOPE_PROCESS + elif scope == capa.rules.Scope.THREAD: + return capa_pb2.Scope.SCOPE_THREAD + elif scope == capa.rules.Scope.CALL: + return capa_pb2.Scope.SCOPE_CALL else: assert_never(scope) -def metadata_to_pb2(meta: rd.Metadata) -> capa_pb2.Metadata: - return capa_pb2.Metadata( - timestamp=str(meta.timestamp), - version=meta.version, - argv=meta.argv, - sample=google.protobuf.json_format.ParseDict(meta.sample.model_dump(), capa_pb2.Sample()), - analysis=capa_pb2.Analysis( - format=meta.analysis.format, - arch=meta.analysis.arch, - os=meta.analysis.os, - extractor=meta.analysis.extractor, - rules=list(meta.analysis.rules), - base_address=addr_to_pb2(meta.analysis.base_address), - layout=capa_pb2.Layout( - functions=[ - capa_pb2.FunctionLayout( - address=addr_to_pb2(f.address), - matched_basic_blocks=[ - capa_pb2.BasicBlockLayout(address=addr_to_pb2(bb.address)) for bb in f.matched_basic_blocks - ], - ) - for f in meta.analysis.layout.functions - ] - ), - feature_counts=capa_pb2.FeatureCounts( - file=meta.analysis.feature_counts.file, - functions=[ - capa_pb2.FunctionFeatureCount(address=addr_to_pb2(f.address), count=f.count) - for f in meta.analysis.feature_counts.functions - ], - ), - library_functions=[ - capa_pb2.LibraryFunction(address=addr_to_pb2(lf.address), name=lf.name) - for lf in meta.analysis.library_functions +def scopes_to_pb2(scopes: capa.rules.Scopes) -> capa_pb2.Scopes: + doc = {} + if scopes.static: + doc["static"] = scope_to_pb2(scopes.static) + if scopes.dynamic: + doc["dynamic"] = scope_to_pb2(scopes.dynamic) + + return google.protobuf.json_format.ParseDict(doc, capa_pb2.Scopes()) + + +def flavor_to_pb2(flavor: rd.Flavor) -> capa_pb2.Flavor.ValueType: + if flavor == rd.Flavor.STATIC: + return capa_pb2.Flavor.FLAVOR_STATIC + elif flavor == rd.Flavor.DYNAMIC: + return capa_pb2.Flavor.FLAVOR_DYNAMIC + else: + assert_never(flavor) + + +def static_analysis_to_pb2(analysis: rd.StaticAnalysis) -> capa_pb2.StaticAnalysis: + return capa_pb2.StaticAnalysis( + format=analysis.format, + arch=analysis.arch, + os=analysis.os, + extractor=analysis.extractor, + rules=list(analysis.rules), + base_address=addr_to_pb2(analysis.base_address), + layout=capa_pb2.StaticLayout( + functions=[ + capa_pb2.FunctionLayout( + address=addr_to_pb2(f.address), + matched_basic_blocks=[ + capa_pb2.BasicBlockLayout(address=addr_to_pb2(bb.address)) for bb in f.matched_basic_blocks + ], + ) + for f in analysis.layout.functions + ] + ), + feature_counts=capa_pb2.StaticFeatureCounts( + file=analysis.feature_counts.file, + functions=[ + capa_pb2.FunctionFeatureCount(address=addr_to_pb2(f.address), count=f.count) + for f in analysis.feature_counts.functions ], ), + library_functions=[ + capa_pb2.LibraryFunction(address=addr_to_pb2(lf.address), name=lf.name) for lf in analysis.library_functions + ], ) +def dynamic_analysis_to_pb2(analysis: rd.DynamicAnalysis) -> capa_pb2.DynamicAnalysis: + return capa_pb2.DynamicAnalysis( + format=analysis.format, + arch=analysis.arch, + os=analysis.os, + extractor=analysis.extractor, + rules=list(analysis.rules), + layout=capa_pb2.DynamicLayout( + processes=[ + capa_pb2.ProcessLayout( + address=addr_to_pb2(p.address), + name=p.name, + matched_threads=[ + capa_pb2.ThreadLayout( + address=addr_to_pb2(t.address), + matched_calls=[ + capa_pb2.CallLayout( + address=addr_to_pb2(c.address), + name=c.name, + ) + for c in t.matched_calls + ], + ) + for t in p.matched_threads + ], + ) + for p in analysis.layout.processes + ] + ), + feature_counts=capa_pb2.DynamicFeatureCounts( + file=analysis.feature_counts.file, + processes=[ + capa_pb2.ProcessFeatureCount(address=addr_to_pb2(p.address), count=p.count) + for p in analysis.feature_counts.processes + ], + ), + ) + + +def metadata_to_pb2(meta: rd.Metadata) -> capa_pb2.Metadata: + if isinstance(meta.analysis, rd.StaticAnalysis): + return capa_pb2.Metadata( + timestamp=str(meta.timestamp), + version=meta.version, + argv=meta.argv, + sample=google.protobuf.json_format.ParseDict(meta.sample.model_dump(), capa_pb2.Sample()), + flavor=flavor_to_pb2(meta.flavor), + static_analysis=static_analysis_to_pb2(meta.analysis), + ) + elif isinstance(meta.analysis, rd.DynamicAnalysis): + return capa_pb2.Metadata( + timestamp=str(meta.timestamp), + version=meta.version, + argv=meta.argv, + sample=google.protobuf.json_format.ParseDict(meta.sample.model_dump(), capa_pb2.Sample()), + flavor=flavor_to_pb2(meta.flavor), + dynamic_analysis=dynamic_analysis_to_pb2(meta.analysis), + ) + else: + assert_never(meta.analysis) + + def statement_to_pb2(statement: rd.Statement) -> capa_pb2.StatementNode: if isinstance(statement, rd.RangeStatement): return capa_pb2.StatementNode( @@ -390,15 +505,51 @@ def match_to_pb2(match: rd.Match) -> capa_pb2.Match: assert_never(match) -def rule_metadata_to_pb2(rule_metadata: rd.RuleMetadata) -> capa_pb2.RuleMetadata: - # after manual type conversions to the RuleMetadata, we can rely on the protobuf json parser - # conversions include tuple -> list and rd.Enum -> proto.enum - meta = dict_tuple_to_list_values(rule_metadata.model_dump()) - meta["scope"] = scope_to_pb2(meta["scope"]) - meta["attack"] = list(map(dict_tuple_to_list_values, meta.get("attack", []))) - meta["mbc"] = list(map(dict_tuple_to_list_values, meta.get("mbc", []))) +def attack_to_pb2(attack: rd.AttackSpec) -> capa_pb2.AttackSpec: + return capa_pb2.AttackSpec( + parts=list(attack.parts), + tactic=attack.tactic, + technique=attack.technique, + subtechnique=attack.subtechnique, + id=attack.id, + ) + + +def mbc_to_pb2(mbc: rd.MBCSpec) -> capa_pb2.MBCSpec: + return capa_pb2.MBCSpec( + parts=list(mbc.parts), + objective=mbc.objective, + behavior=mbc.behavior, + method=mbc.method, + id=mbc.id, + ) + - return google.protobuf.json_format.ParseDict(meta, capa_pb2.RuleMetadata()) +def maec_to_pb2(maec: rd.MaecMetadata) -> capa_pb2.MaecMetadata: + return capa_pb2.MaecMetadata( + analysis_conclusion=maec.analysis_conclusion or "", + analysis_conclusion_ov=maec.analysis_conclusion_ov or "", + malware_family=maec.malware_family or "", + malware_category=maec.malware_category or "", + malware_category_ov=maec.malware_category_ov or "", + ) + + +def rule_metadata_to_pb2(rule_metadata: rd.RuleMetadata) -> capa_pb2.RuleMetadata: + return capa_pb2.RuleMetadata( + name=rule_metadata.name, + namespace=rule_metadata.namespace or "", + authors=rule_metadata.authors, + attack=[attack_to_pb2(m) for m in rule_metadata.attack], + mbc=[mbc_to_pb2(m) for m in rule_metadata.mbc], + references=rule_metadata.references, + examples=rule_metadata.examples, + description=rule_metadata.description, + lib=rule_metadata.lib, + maec=maec_to_pb2(rule_metadata.maec), + is_subscope_rule=rule_metadata.is_subscope_rule, + scopes=scopes_to_pb2(rule_metadata.scopes), + ) def doc_to_pb2(doc: rd.ResultDocument) -> capa_pb2.ResultDocument: @@ -459,6 +610,24 @@ def addr_from_pb2(addr: capa_pb2.Address) -> frz.Address: offset = addr.token_offset.offset return frz.Address(type=frz.AddressType.DN_TOKEN_OFFSET, value=(token, offset)) + elif addr.type == capa_pb2.AddressType.ADDRESSTYPE_PROCESS: + ppid = int_from_pb2(addr.ppid_pid.ppid) + pid = int_from_pb2(addr.ppid_pid.pid) + return frz.Address(type=frz.AddressType.PROCESS, value=(ppid, pid)) + + elif addr.type == capa_pb2.AddressType.ADDRESSTYPE_THREAD: + ppid = int_from_pb2(addr.ppid_pid_tid.ppid) + pid = int_from_pb2(addr.ppid_pid_tid.pid) + tid = int_from_pb2(addr.ppid_pid_tid.tid) + return frz.Address(type=frz.AddressType.THREAD, value=(ppid, pid, tid)) + + elif addr.type == capa_pb2.AddressType.ADDRESSTYPE_CALL: + ppid = int_from_pb2(addr.ppid_pid_tid_id.ppid) + pid = int_from_pb2(addr.ppid_pid_tid_id.pid) + tid = int_from_pb2(addr.ppid_pid_tid_id.tid) + id_ = int_from_pb2(addr.ppid_pid_tid_id.id) + return frz.Address(type=frz.AddressType.CALL, value=(ppid, pid, tid, id_)) + elif addr.type == capa_pb2.AddressType.ADDRESSTYPE_NO_ADDRESS: return frz.Address(type=frz.AddressType.NO_ADDRESS, value=None) @@ -475,63 +644,146 @@ def scope_from_pb2(scope: capa_pb2.Scope.ValueType) -> capa.rules.Scope: return capa.rules.Scope.BASIC_BLOCK elif scope == capa_pb2.Scope.SCOPE_INSTRUCTION: return capa.rules.Scope.INSTRUCTION + elif scope == capa_pb2.Scope.SCOPE_PROCESS: + return capa.rules.Scope.PROCESS + elif scope == capa_pb2.Scope.SCOPE_THREAD: + return capa.rules.Scope.THREAD + elif scope == capa_pb2.Scope.SCOPE_CALL: + return capa.rules.Scope.CALL else: assert_never(scope) -def metadata_from_pb2(meta: capa_pb2.Metadata) -> rd.Metadata: - return rd.Metadata( - timestamp=datetime.datetime.fromisoformat(meta.timestamp), - version=meta.version, - argv=tuple(meta.argv) if meta.argv else None, - sample=rd.Sample( - md5=meta.sample.md5, - sha1=meta.sample.sha1, - sha256=meta.sample.sha256, - path=meta.sample.path, +def scopes_from_pb2(scopes: capa_pb2.Scopes) -> capa.rules.Scopes: + return capa.rules.Scopes( + static=scope_from_pb2(scopes.static) if scopes.static else None, + dynamic=scope_from_pb2(scopes.dynamic) if scopes.dynamic else None, + ) + + +def flavor_from_pb2(flavor: capa_pb2.Flavor.ValueType) -> rd.Flavor: + if flavor == capa_pb2.Flavor.FLAVOR_STATIC: + return rd.Flavor.STATIC + elif flavor == capa_pb2.Flavor.FLAVOR_DYNAMIC: + return rd.Flavor.DYNAMIC + else: + assert_never(flavor) + + +def static_analysis_from_pb2(analysis: capa_pb2.StaticAnalysis) -> rd.StaticAnalysis: + return rd.StaticAnalysis( + format=analysis.format, + arch=analysis.arch, + os=analysis.os, + extractor=analysis.extractor, + rules=tuple(analysis.rules), + base_address=addr_from_pb2(analysis.base_address), + layout=rd.StaticLayout( + functions=tuple( + [ + rd.FunctionLayout( + address=addr_from_pb2(f.address), + matched_basic_blocks=tuple( + [rd.BasicBlockLayout(address=addr_from_pb2(bb.address)) for bb in f.matched_basic_blocks] + ), + ) + for f in analysis.layout.functions + ] + ) ), - analysis=rd.Analysis( - format=meta.analysis.format, - arch=meta.analysis.arch, - os=meta.analysis.os, - extractor=meta.analysis.extractor, - rules=tuple(meta.analysis.rules), - base_address=addr_from_pb2(meta.analysis.base_address), - layout=rd.Layout( - functions=tuple( - [ - rd.FunctionLayout( - address=addr_from_pb2(f.address), - matched_basic_blocks=tuple( - [ - rd.BasicBlockLayout(address=addr_from_pb2(bb.address)) - for bb in f.matched_basic_blocks - ] - ), - ) - for f in meta.analysis.layout.functions - ] - ) - ), - feature_counts=rd.FeatureCounts( - file=meta.analysis.feature_counts.file, - functions=tuple( - [ - rd.FunctionFeatureCount(address=addr_from_pb2(f.address), count=f.count) - for f in meta.analysis.feature_counts.functions - ] - ), + feature_counts=rd.StaticFeatureCounts( + file=analysis.feature_counts.file, + functions=tuple( + [ + rd.FunctionFeatureCount(address=addr_from_pb2(f.address), count=f.count) + for f in analysis.feature_counts.functions + ] ), - library_functions=tuple( + ), + library_functions=tuple( + [rd.LibraryFunction(address=addr_from_pb2(lf.address), name=lf.name) for lf in analysis.library_functions] + ), + ) + + +def dynamic_analysis_from_pb2(analysis: capa_pb2.DynamicAnalysis) -> rd.DynamicAnalysis: + return rd.DynamicAnalysis( + format=analysis.format, + arch=analysis.arch, + os=analysis.os, + extractor=analysis.extractor, + rules=tuple(analysis.rules), + layout=rd.DynamicLayout( + processes=tuple( [ - rd.LibraryFunction(address=addr_from_pb2(lf.address), name=lf.name) - for lf in meta.analysis.library_functions + rd.ProcessLayout( + address=addr_from_pb2(p.address), + name=p.name, + matched_threads=tuple( + [ + rd.ThreadLayout( + address=addr_from_pb2(t.address), + matched_calls=tuple( + [ + rd.CallLayout(address=addr_from_pb2(c.address), name=c.name) + for c in t.matched_calls + ] + ), + ) + for t in p.matched_threads + ] + ), + ) + for p in analysis.layout.processes + ] + ) + ), + feature_counts=rd.DynamicFeatureCounts( + file=analysis.feature_counts.file, + processes=tuple( + [ + rd.ProcessFeatureCount(address=addr_from_pb2(p.address), count=p.count) + for p in analysis.feature_counts.processes ] ), ), ) +def metadata_from_pb2(meta: capa_pb2.Metadata) -> rd.Metadata: + analysis_type = meta.WhichOneof("analysis2") + if analysis_type == "static_analysis": + return rd.Metadata( + timestamp=datetime.datetime.fromisoformat(meta.timestamp), + version=meta.version, + argv=tuple(meta.argv) if meta.argv else None, + sample=rd.Sample( + md5=meta.sample.md5, + sha1=meta.sample.sha1, + sha256=meta.sample.sha256, + path=meta.sample.path, + ), + flavor=flavor_from_pb2(meta.flavor), + analysis=static_analysis_from_pb2(meta.static_analysis), + ) + elif analysis_type == "dynamic_analysis": + return rd.Metadata( + timestamp=datetime.datetime.fromisoformat(meta.timestamp), + version=meta.version, + argv=tuple(meta.argv) if meta.argv else None, + sample=rd.Sample( + md5=meta.sample.md5, + sha1=meta.sample.sha1, + sha256=meta.sample.sha256, + path=meta.sample.path, + ), + flavor=flavor_from_pb2(meta.flavor), + analysis=dynamic_analysis_from_pb2(meta.dynamic_analysis), + ) + else: + assert_never(analysis_type) + + def statement_from_pb2(statement: capa_pb2.StatementNode) -> rd.Statement: type_ = statement.WhichOneof("statement") @@ -711,7 +963,7 @@ def rule_metadata_from_pb2(pb: capa_pb2.RuleMetadata) -> rd.RuleMetadata: name=pb.name, namespace=pb.namespace or None, authors=tuple(pb.authors), - scope=scope_from_pb2(pb.scope), + scopes=scopes_from_pb2(pb.scopes), attack=tuple([attack_from_pb2(attack) for attack in pb.attack]), mbc=tuple([mbc_from_pb2(mbc) for mbc in pb.mbc]), references=tuple(pb.references), diff --git a/capa/render/proto/capa.proto b/capa/render/proto/capa.proto index 39700c5bc..904bc04fe 100644 --- a/capa/render/proto/capa.proto +++ b/capa/render/proto/capa.proto @@ -11,6 +11,9 @@ message Address { oneof value { Integer v = 2; Token_Offset token_offset = 3; + Ppid_Pid ppid_pid = 4; + Ppid_Pid_Tid ppid_pid_tid = 5; + Ppid_Pid_Tid_Id ppid_pid_tid_id = 6; }; } @@ -22,6 +25,9 @@ enum AddressType { ADDRESSTYPE_DN_TOKEN = 4; ADDRESSTYPE_DN_TOKEN_OFFSET = 5; ADDRESSTYPE_NO_ADDRESS = 6; + ADDRESSTYPE_PROCESS = 7; + ADDRESSTYPE_THREAD = 8; + ADDRESSTYPE_CALL = 9; } message Analysis { @@ -82,6 +88,25 @@ message CompoundStatement { optional string description = 2; } +message DynamicAnalysis { + string format = 1; + string arch = 2; + string os = 3; + string extractor = 4; + repeated string rules = 5; + DynamicLayout layout = 6; + DynamicFeatureCounts feature_counts = 7; +} + +message DynamicFeatureCounts { + uint64 file = 1; + repeated ProcessFeatureCount processes = 2; +} + +message DynamicLayout { + repeated ProcessLayout processes = 1; +} + message ExportFeature { string type = 1; string export = 2; @@ -192,12 +217,26 @@ message MatchFeature { optional string description = 3; } +enum Flavor { + FLAVOR_UNSPECIFIED = 0; + FLAVOR_STATIC = 1; + FLAVOR_DYNAMIC = 2; +} + message Metadata { string timestamp = 1; // iso8601 format, like: 2019-01-01T00:00:00Z string version = 2; repeated string argv = 3; Sample sample = 4; - Analysis analysis = 5; + // deprecated in v7.0. + // use analysis2 instead. + Analysis analysis = 5 [deprecated = true]; + Flavor flavor = 6; + oneof analysis2 { + // use analysis2 instead of analysis (deprecated in v7.0). + StaticAnalysis static_analysis = 7; + DynamicAnalysis dynamic_analysis = 8; + }; } message MnemonicFeature { @@ -244,6 +283,17 @@ message OperandOffsetFeature { optional string description = 4; } +message ProcessFeatureCount { + Address address = 1; + uint64 count = 2; +} + +message ProcessLayout { + Address address = 1; + repeated ThreadLayout matched_threads = 2; + string name = 3; +} + message PropertyFeature { string type = 1; string property_ = 2; // property is a Python top-level decorator name @@ -281,7 +331,9 @@ message RuleMetadata { string name = 1; string namespace = 2; repeated string authors = 3; - Scope scope = 4; + // deprecated in v7.0. + // use scopes instead. + Scope scope = 4 [deprecated = true]; repeated AttackSpec attack = 5; repeated MBCSpec mbc = 6; repeated string references = 7; @@ -290,6 +342,8 @@ message RuleMetadata { bool lib = 10; MaecMetadata maec = 11; bool is_subscope_rule = 12; + // use scopes over scope (deprecated in v7.0). + Scopes scopes = 13; } message Sample { @@ -305,6 +359,14 @@ enum Scope { SCOPE_FUNCTION = 2; SCOPE_BASIC_BLOCK = 3; SCOPE_INSTRUCTION = 4; + SCOPE_PROCESS = 5; + SCOPE_THREAD = 6; + SCOPE_CALL = 7; +} + +message Scopes { + optional Scope static = 1; + optional Scope dynamic = 2; } message SectionFeature { @@ -329,6 +391,27 @@ message StatementNode { }; } +message StaticAnalysis { + string format = 1; + string arch = 2; + string os = 3; + string extractor = 4; + repeated string rules = 5; + Address base_address = 6; + StaticLayout layout = 7; + StaticFeatureCounts feature_counts = 8; + repeated LibraryFunction library_functions = 9; +} + +message StaticFeatureCounts { + uint64 file = 1; + repeated FunctionFeatureCount functions = 2; +} + +message StaticLayout { + repeated FunctionLayout functions = 1; +} + message StringFeature { string type = 1; string string = 2; @@ -347,6 +430,16 @@ message SubstringFeature { optional string description = 3; } +message CallLayout { + Address address = 1; + string name = 2; +} + +message ThreadLayout { + Address address = 1; + repeated CallLayout matched_calls = 2; +} + message Addresses { repeated Address address = 1; } message Pair_Address_Match { @@ -359,6 +452,24 @@ message Token_Offset { uint64 offset = 2; // offset is always >= 0 } +message Ppid_Pid { + Integer ppid = 1; + Integer pid = 2; +} + +message Ppid_Pid_Tid { + Integer ppid = 1; + Integer pid = 2; + Integer tid = 3; +} + +message Ppid_Pid_Tid_Id { + Integer ppid = 1; + Integer pid = 2; + Integer tid = 3; + Integer id = 4; +} + message Integer { oneof value { uint64 u = 1; sint64 i = 2; } } // unsigned or signed int message Number { oneof value { uint64 u = 1; sint64 i = 2; double f = 3; } } diff --git a/capa/render/proto/capa_pb2.py b/capa/render/proto/capa_pb2.py index d4ca17d0c..fdee72927 100644 --- a/capa/render/proto/capa_pb2.py +++ b/capa/render/proto/capa_pb2.py @@ -13,7 +13,7 @@ -DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1c\x63\x61pa/render/proto/capa.proto\"Q\n\nAPIFeature\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\x0b\n\x03\x61pi\x18\x02 \x01(\t\x12\x18\n\x0b\x64\x65scription\x18\x03 \x01(\tH\x00\x88\x01\x01\x42\x0e\n\x0c_description\"l\n\x07\x41\x64\x64ress\x12\x1a\n\x04type\x18\x01 \x01(\x0e\x32\x0c.AddressType\x12\x15\n\x01v\x18\x02 \x01(\x0b\x32\x08.IntegerH\x00\x12%\n\x0ctoken_offset\x18\x03 \x01(\x0b\x32\r.Token_OffsetH\x00\x42\x07\n\x05value\"\xe4\x01\n\x08\x41nalysis\x12\x0e\n\x06\x66ormat\x18\x01 \x01(\t\x12\x0c\n\x04\x61rch\x18\x02 \x01(\t\x12\n\n\x02os\x18\x03 \x01(\t\x12\x11\n\textractor\x18\x04 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_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals()) _builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'capa.render.proto.capa_pb2', globals()) @@ -22,116 +22,150 @@ DESCRIPTOR._options = None _MATCH_CAPTURESENTRY._options = None _MATCH_CAPTURESENTRY._serialized_options = b'8\001' + _METADATA.fields_by_name['analysis']._options = None + _METADATA.fields_by_name['analysis']._serialized_options = b'\030\001' _RESULTDOCUMENT_RULESENTRY._options = None _RESULTDOCUMENT_RULESENTRY._serialized_options = b'8\001' - _ADDRESSTYPE._serialized_start=6006 - _ADDRESSTYPE._serialized_end=6209 - _SCOPE._serialized_start=6211 - _SCOPE._serialized_end=6323 + _RULEMETADATA.fields_by_name['scope']._options = None + _RULEMETADATA.fields_by_name['scope']._serialized_options = b'\030\001' + _ADDRESSTYPE._serialized_start=7615 + _ADDRESSTYPE._serialized_end=7889 + _FLAVOR._serialized_start=7891 + _FLAVOR._serialized_end=7962 + _SCOPE._serialized_start=7965 + _SCOPE._serialized_end=8130 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_TOKEN_OFFSET._serialized_start=7197 + _TOKEN_OFFSET._serialized_end=7252 + _PPID_PID._serialized_start=7254 + _PPID_PID._serialized_end=7311 + _PPID_PID_TID._serialized_start=7313 + _PPID_PID_TID._serialized_end=7397 + _PPID_PID_TID_ID._serialized_start=7399 + _PPID_PID_TID_ID._serialized_end=7508 + _INTEGER._serialized_start=7510 + _INTEGER._serialized_end=7554 + _NUMBER._serialized_start=7556 + _NUMBER._serialized_end=7612 # @@protoc_insertion_point(module_scope) diff --git a/capa/render/proto/capa_pb2.pyi b/capa/render/proto/capa_pb2.pyi index 174b1a974..ecb330bc6 100644 --- a/capa/render/proto/capa_pb2.pyi +++ b/capa/render/proto/capa_pb2.pyi @@ -31,6 +31,9 @@ class _AddressTypeEnumTypeWrapper(google.protobuf.internal.enum_type_wrapper._En ADDRESSTYPE_DN_TOKEN: _AddressType.ValueType # 4 ADDRESSTYPE_DN_TOKEN_OFFSET: _AddressType.ValueType # 5 ADDRESSTYPE_NO_ADDRESS: _AddressType.ValueType # 6 + ADDRESSTYPE_PROCESS: _AddressType.ValueType # 7 + ADDRESSTYPE_THREAD: _AddressType.ValueType # 8 + ADDRESSTYPE_CALL: _AddressType.ValueType # 9 class AddressType(_AddressType, metaclass=_AddressTypeEnumTypeWrapper): ... @@ -41,8 +44,28 @@ ADDRESSTYPE_FILE: AddressType.ValueType # 3 ADDRESSTYPE_DN_TOKEN: AddressType.ValueType # 4 ADDRESSTYPE_DN_TOKEN_OFFSET: AddressType.ValueType # 5 ADDRESSTYPE_NO_ADDRESS: AddressType.ValueType # 6 +ADDRESSTYPE_PROCESS: AddressType.ValueType # 7 +ADDRESSTYPE_THREAD: AddressType.ValueType # 8 +ADDRESSTYPE_CALL: AddressType.ValueType # 9 global___AddressType = AddressType +class _Flavor: + ValueType = typing.NewType("ValueType", builtins.int) + V: typing_extensions.TypeAlias = ValueType + +class _FlavorEnumTypeWrapper(google.protobuf.internal.enum_type_wrapper._EnumTypeWrapper[_Flavor.ValueType], builtins.type): + DESCRIPTOR: google.protobuf.descriptor.EnumDescriptor + FLAVOR_UNSPECIFIED: _Flavor.ValueType # 0 + FLAVOR_STATIC: _Flavor.ValueType # 1 + FLAVOR_DYNAMIC: _Flavor.ValueType # 2 + +class Flavor(_Flavor, metaclass=_FlavorEnumTypeWrapper): ... + +FLAVOR_UNSPECIFIED: Flavor.ValueType # 0 +FLAVOR_STATIC: Flavor.ValueType # 1 +FLAVOR_DYNAMIC: Flavor.ValueType # 2 +global___Flavor = Flavor + class _Scope: ValueType = typing.NewType("ValueType", builtins.int) V: typing_extensions.TypeAlias = ValueType @@ -54,6 +77,9 @@ class _ScopeEnumTypeWrapper(google.protobuf.internal.enum_type_wrapper._EnumType SCOPE_FUNCTION: _Scope.ValueType # 2 SCOPE_BASIC_BLOCK: _Scope.ValueType # 3 SCOPE_INSTRUCTION: _Scope.ValueType # 4 + SCOPE_PROCESS: _Scope.ValueType # 5 + SCOPE_THREAD: _Scope.ValueType # 6 + SCOPE_CALL: _Scope.ValueType # 7 class Scope(_Scope, metaclass=_ScopeEnumTypeWrapper): ... @@ -62,6 +88,9 @@ SCOPE_FILE: Scope.ValueType # 1 SCOPE_FUNCTION: Scope.ValueType # 2 SCOPE_BASIC_BLOCK: Scope.ValueType # 3 SCOPE_INSTRUCTION: Scope.ValueType # 4 +SCOPE_PROCESS: Scope.ValueType # 5 +SCOPE_THREAD: Scope.ValueType # 6 +SCOPE_CALL: Scope.ValueType # 7 global___Scope = Scope @typing_extensions.final @@ -94,21 +123,33 @@ class Address(google.protobuf.message.Message): TYPE_FIELD_NUMBER: builtins.int V_FIELD_NUMBER: builtins.int TOKEN_OFFSET_FIELD_NUMBER: builtins.int + PPID_PID_FIELD_NUMBER: builtins.int + PPID_PID_TID_FIELD_NUMBER: builtins.int + PPID_PID_TID_ID_FIELD_NUMBER: builtins.int type: global___AddressType.ValueType @property def v(self) -> global___Integer: ... @property def token_offset(self) -> global___Token_Offset: ... + @property + def ppid_pid(self) -> global___Ppid_Pid: ... + @property + def ppid_pid_tid(self) -> global___Ppid_Pid_Tid: ... + @property + def ppid_pid_tid_id(self) -> global___Ppid_Pid_Tid_Id: ... def __init__( self, *, type: global___AddressType.ValueType = ..., v: global___Integer | None = ..., token_offset: global___Token_Offset | None = ..., + ppid_pid: global___Ppid_Pid | None = ..., + ppid_pid_tid: global___Ppid_Pid_Tid | None = ..., + ppid_pid_tid_id: global___Ppid_Pid_Tid_Id | None = ..., ) -> None: ... - def HasField(self, field_name: typing_extensions.Literal["token_offset", b"token_offset", "v", b"v", "value", b"value"]) -> builtins.bool: ... - def ClearField(self, field_name: typing_extensions.Literal["token_offset", b"token_offset", "type", b"type", "v", b"v", "value", b"value"]) -> None: ... - def WhichOneof(self, oneof_group: typing_extensions.Literal["value", b"value"]) -> typing_extensions.Literal["v", "token_offset"] | None: ... + def HasField(self, field_name: typing_extensions.Literal["ppid_pid", b"ppid_pid", "ppid_pid_tid", b"ppid_pid_tid", "ppid_pid_tid_id", b"ppid_pid_tid_id", "token_offset", b"token_offset", "v", b"v", "value", b"value"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["ppid_pid", b"ppid_pid", "ppid_pid_tid", b"ppid_pid_tid", "ppid_pid_tid_id", b"ppid_pid_tid_id", "token_offset", b"token_offset", "type", b"type", "v", b"v", "value", b"value"]) -> None: ... + def WhichOneof(self, oneof_group: typing_extensions.Literal["value", b"value"]) -> typing_extensions.Literal["v", "token_offset", "ppid_pid", "ppid_pid_tid", "ppid_pid_tid_id"] | None: ... global___Address = Address @@ -335,6 +376,78 @@ class CompoundStatement(google.protobuf.message.Message): global___CompoundStatement = CompoundStatement +@typing_extensions.final +class DynamicAnalysis(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + FORMAT_FIELD_NUMBER: builtins.int + ARCH_FIELD_NUMBER: builtins.int + OS_FIELD_NUMBER: builtins.int + EXTRACTOR_FIELD_NUMBER: builtins.int + RULES_FIELD_NUMBER: builtins.int + LAYOUT_FIELD_NUMBER: builtins.int + FEATURE_COUNTS_FIELD_NUMBER: builtins.int + format: builtins.str + arch: builtins.str + os: builtins.str + extractor: builtins.str + @property + def rules(self) -> google.protobuf.internal.containers.RepeatedScalarFieldContainer[builtins.str]: ... + @property + def layout(self) -> global___DynamicLayout: ... + @property + def feature_counts(self) -> global___DynamicFeatureCounts: ... + def __init__( + self, + *, + format: builtins.str = ..., + arch: builtins.str = ..., + os: builtins.str = ..., + extractor: builtins.str = ..., + rules: collections.abc.Iterable[builtins.str] | None = ..., + layout: global___DynamicLayout | None = ..., + feature_counts: global___DynamicFeatureCounts | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["feature_counts", b"feature_counts", "layout", b"layout"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["arch", b"arch", "extractor", b"extractor", "feature_counts", b"feature_counts", "format", b"format", "layout", b"layout", "os", b"os", "rules", b"rules"]) -> None: ... + +global___DynamicAnalysis = DynamicAnalysis + +@typing_extensions.final +class DynamicFeatureCounts(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + FILE_FIELD_NUMBER: builtins.int + PROCESSES_FIELD_NUMBER: builtins.int + file: builtins.int + @property + def processes(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___ProcessFeatureCount]: ... + def __init__( + self, + *, + file: builtins.int = ..., + processes: collections.abc.Iterable[global___ProcessFeatureCount] | None = ..., + ) -> None: ... + def ClearField(self, field_name: typing_extensions.Literal["file", b"file", "processes", b"processes"]) -> None: ... + +global___DynamicFeatureCounts = DynamicFeatureCounts + +@typing_extensions.final +class DynamicLayout(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + PROCESSES_FIELD_NUMBER: builtins.int + @property + def processes(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___ProcessLayout]: ... + def __init__( + self, + *, + processes: collections.abc.Iterable[global___ProcessLayout] | None = ..., + ) -> None: ... + def ClearField(self, field_name: typing_extensions.Literal["processes", b"processes"]) -> None: ... + +global___DynamicLayout = DynamicLayout + @typing_extensions.final class ExportFeature(google.protobuf.message.Message): DESCRIPTOR: google.protobuf.descriptor.Descriptor @@ -776,6 +889,9 @@ class Metadata(google.protobuf.message.Message): ARGV_FIELD_NUMBER: builtins.int SAMPLE_FIELD_NUMBER: builtins.int ANALYSIS_FIELD_NUMBER: builtins.int + FLAVOR_FIELD_NUMBER: builtins.int + STATIC_ANALYSIS_FIELD_NUMBER: builtins.int + DYNAMIC_ANALYSIS_FIELD_NUMBER: builtins.int timestamp: builtins.str """iso8601 format, like: 2019-01-01T00:00:00Z""" version: builtins.str @@ -784,7 +900,16 @@ class Metadata(google.protobuf.message.Message): @property def sample(self) -> global___Sample: ... @property - def analysis(self) -> global___Analysis: ... + def analysis(self) -> global___Analysis: + """deprecated in v7.0. + use analysis2 instead. + """ + flavor: global___Flavor.ValueType + @property + def static_analysis(self) -> global___StaticAnalysis: + """use analysis2 instead of analysis (deprecated in v7.0).""" + @property + def dynamic_analysis(self) -> global___DynamicAnalysis: ... def __init__( self, *, @@ -793,9 +918,13 @@ class Metadata(google.protobuf.message.Message): argv: collections.abc.Iterable[builtins.str] | None = ..., sample: global___Sample | None = ..., analysis: global___Analysis | None = ..., + flavor: global___Flavor.ValueType = ..., + static_analysis: global___StaticAnalysis | None = ..., + dynamic_analysis: global___DynamicAnalysis | None = ..., ) -> None: ... - def HasField(self, field_name: typing_extensions.Literal["analysis", b"analysis", "sample", b"sample"]) -> builtins.bool: ... - def ClearField(self, field_name: typing_extensions.Literal["analysis", b"analysis", "argv", b"argv", "sample", b"sample", "timestamp", b"timestamp", "version", b"version"]) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["analysis", b"analysis", "analysis2", b"analysis2", "dynamic_analysis", b"dynamic_analysis", "sample", b"sample", "static_analysis", b"static_analysis"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["analysis", b"analysis", "analysis2", b"analysis2", "argv", b"argv", "dynamic_analysis", b"dynamic_analysis", "flavor", b"flavor", "sample", b"sample", "static_analysis", b"static_analysis", "timestamp", b"timestamp", "version", b"version"]) -> None: ... + def WhichOneof(self, oneof_group: typing_extensions.Literal["analysis2", b"analysis2"]) -> typing_extensions.Literal["static_analysis", "dynamic_analysis"] | None: ... global___Metadata = Metadata @@ -973,6 +1102,50 @@ class OperandOffsetFeature(google.protobuf.message.Message): global___OperandOffsetFeature = OperandOffsetFeature +@typing_extensions.final +class ProcessFeatureCount(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + ADDRESS_FIELD_NUMBER: builtins.int + COUNT_FIELD_NUMBER: builtins.int + @property + def address(self) -> global___Address: ... + count: builtins.int + def __init__( + self, + *, + address: global___Address | None = ..., + count: builtins.int = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["address", b"address"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["address", b"address", "count", b"count"]) -> None: ... + +global___ProcessFeatureCount = ProcessFeatureCount + +@typing_extensions.final +class ProcessLayout(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + ADDRESS_FIELD_NUMBER: builtins.int + MATCHED_THREADS_FIELD_NUMBER: builtins.int + NAME_FIELD_NUMBER: builtins.int + @property + def address(self) -> global___Address: ... + @property + def matched_threads(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___ThreadLayout]: ... + name: builtins.str + def __init__( + self, + *, + address: global___Address | None = ..., + matched_threads: collections.abc.Iterable[global___ThreadLayout] | None = ..., + name: builtins.str = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["address", b"address"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["address", b"address", "matched_threads", b"matched_threads", "name", b"name"]) -> None: ... + +global___ProcessLayout = ProcessLayout + @typing_extensions.final class PropertyFeature(google.protobuf.message.Message): DESCRIPTOR: google.protobuf.descriptor.Descriptor @@ -1136,11 +1309,15 @@ class RuleMetadata(google.protobuf.message.Message): LIB_FIELD_NUMBER: builtins.int MAEC_FIELD_NUMBER: builtins.int IS_SUBSCOPE_RULE_FIELD_NUMBER: builtins.int + SCOPES_FIELD_NUMBER: builtins.int name: builtins.str namespace: builtins.str @property def authors(self) -> google.protobuf.internal.containers.RepeatedScalarFieldContainer[builtins.str]: ... scope: global___Scope.ValueType + """deprecated in v7.0. + use scopes instead. + """ @property def attack(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___AttackSpec]: ... @property @@ -1154,6 +1331,9 @@ class RuleMetadata(google.protobuf.message.Message): @property def maec(self) -> global___MaecMetadata: ... is_subscope_rule: builtins.bool + @property + def scopes(self) -> global___Scopes: + """use scopes over scope (deprecated in v7.0).""" def __init__( self, *, @@ -1169,9 +1349,10 @@ class RuleMetadata(google.protobuf.message.Message): lib: builtins.bool = ..., maec: global___MaecMetadata | None = ..., is_subscope_rule: builtins.bool = ..., + scopes: global___Scopes | None = ..., ) -> None: ... - def HasField(self, field_name: typing_extensions.Literal["maec", b"maec"]) -> builtins.bool: ... - def ClearField(self, field_name: typing_extensions.Literal["attack", b"attack", "authors", b"authors", "description", b"description", "examples", b"examples", "is_subscope_rule", b"is_subscope_rule", "lib", b"lib", "maec", b"maec", "mbc", b"mbc", "name", b"name", "namespace", b"namespace", "references", b"references", "scope", b"scope"]) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["maec", b"maec", "scopes", b"scopes"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["attack", b"attack", "authors", b"authors", "description", b"description", "examples", b"examples", "is_subscope_rule", b"is_subscope_rule", "lib", b"lib", "maec", b"maec", "mbc", b"mbc", "name", b"name", "namespace", b"namespace", "references", b"references", "scope", b"scope", "scopes", b"scopes"]) -> None: ... global___RuleMetadata = RuleMetadata @@ -1199,6 +1380,29 @@ class Sample(google.protobuf.message.Message): global___Sample = Sample +@typing_extensions.final +class Scopes(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + STATIC_FIELD_NUMBER: builtins.int + DYNAMIC_FIELD_NUMBER: builtins.int + static: global___Scope.ValueType + dynamic: global___Scope.ValueType + def __init__( + self, + *, + static: global___Scope.ValueType | None = ..., + dynamic: global___Scope.ValueType | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["_dynamic", b"_dynamic", "_static", b"_static", "dynamic", b"dynamic", "static", b"static"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["_dynamic", b"_dynamic", "_static", b"_static", "dynamic", b"dynamic", "static", b"static"]) -> None: ... + @typing.overload + def WhichOneof(self, oneof_group: typing_extensions.Literal["_dynamic", b"_dynamic"]) -> typing_extensions.Literal["dynamic"] | None: ... + @typing.overload + def WhichOneof(self, oneof_group: typing_extensions.Literal["_static", b"_static"]) -> typing_extensions.Literal["static"] | None: ... + +global___Scopes = Scopes + @typing_extensions.final class SectionFeature(google.protobuf.message.Message): DESCRIPTOR: google.protobuf.descriptor.Descriptor @@ -1278,6 +1482,86 @@ class StatementNode(google.protobuf.message.Message): global___StatementNode = StatementNode +@typing_extensions.final +class StaticAnalysis(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + FORMAT_FIELD_NUMBER: builtins.int + ARCH_FIELD_NUMBER: builtins.int + OS_FIELD_NUMBER: builtins.int + EXTRACTOR_FIELD_NUMBER: builtins.int + RULES_FIELD_NUMBER: builtins.int + BASE_ADDRESS_FIELD_NUMBER: builtins.int + LAYOUT_FIELD_NUMBER: builtins.int + FEATURE_COUNTS_FIELD_NUMBER: builtins.int + LIBRARY_FUNCTIONS_FIELD_NUMBER: builtins.int + format: builtins.str + arch: builtins.str + os: builtins.str + extractor: builtins.str + @property + def rules(self) -> google.protobuf.internal.containers.RepeatedScalarFieldContainer[builtins.str]: ... + @property + def base_address(self) -> global___Address: ... + @property + def layout(self) -> global___StaticLayout: ... + @property + def feature_counts(self) -> global___StaticFeatureCounts: ... + @property + def library_functions(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___LibraryFunction]: ... + def __init__( + self, + *, + format: builtins.str = ..., + arch: builtins.str = ..., + os: builtins.str = ..., + extractor: builtins.str = ..., + rules: collections.abc.Iterable[builtins.str] | None = ..., + base_address: global___Address | None = ..., + layout: global___StaticLayout | None = ..., + feature_counts: global___StaticFeatureCounts | None = ..., + library_functions: collections.abc.Iterable[global___LibraryFunction] | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["base_address", b"base_address", "feature_counts", b"feature_counts", "layout", b"layout"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["arch", b"arch", "base_address", b"base_address", "extractor", b"extractor", "feature_counts", b"feature_counts", "format", b"format", "layout", b"layout", "library_functions", b"library_functions", "os", b"os", "rules", b"rules"]) -> None: ... + +global___StaticAnalysis = StaticAnalysis + +@typing_extensions.final +class StaticFeatureCounts(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + FILE_FIELD_NUMBER: builtins.int + FUNCTIONS_FIELD_NUMBER: builtins.int + file: builtins.int + @property + def functions(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___FunctionFeatureCount]: ... + def __init__( + self, + *, + file: builtins.int = ..., + functions: collections.abc.Iterable[global___FunctionFeatureCount] | None = ..., + ) -> None: ... + def ClearField(self, field_name: typing_extensions.Literal["file", b"file", "functions", b"functions"]) -> None: ... + +global___StaticFeatureCounts = StaticFeatureCounts + +@typing_extensions.final +class StaticLayout(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + FUNCTIONS_FIELD_NUMBER: builtins.int + @property + def functions(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___FunctionLayout]: ... + def __init__( + self, + *, + functions: collections.abc.Iterable[global___FunctionLayout] | None = ..., + ) -> None: ... + def ClearField(self, field_name: typing_extensions.Literal["functions", b"functions"]) -> None: ... + +global___StaticLayout = StaticLayout + @typing_extensions.final class StringFeature(google.protobuf.message.Message): DESCRIPTOR: google.protobuf.descriptor.Descriptor @@ -1347,6 +1631,47 @@ class SubstringFeature(google.protobuf.message.Message): global___SubstringFeature = SubstringFeature +@typing_extensions.final +class CallLayout(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + ADDRESS_FIELD_NUMBER: builtins.int + NAME_FIELD_NUMBER: builtins.int + @property + def address(self) -> global___Address: ... + name: builtins.str + def __init__( + self, + *, + address: global___Address | None = ..., + name: builtins.str = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["address", b"address"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["address", b"address", "name", b"name"]) -> None: ... + +global___CallLayout = CallLayout + +@typing_extensions.final +class ThreadLayout(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + ADDRESS_FIELD_NUMBER: builtins.int + MATCHED_CALLS_FIELD_NUMBER: builtins.int + @property + def address(self) -> global___Address: ... + @property + def matched_calls(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___CallLayout]: ... + def __init__( + self, + *, + address: global___Address | None = ..., + matched_calls: collections.abc.Iterable[global___CallLayout] | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["address", b"address"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["address", b"address", "matched_calls", b"matched_calls"]) -> None: ... + +global___ThreadLayout = ThreadLayout + @typing_extensions.final class Addresses(google.protobuf.message.Message): DESCRIPTOR: google.protobuf.descriptor.Descriptor @@ -1405,6 +1730,81 @@ class Token_Offset(google.protobuf.message.Message): global___Token_Offset = Token_Offset +@typing_extensions.final +class Ppid_Pid(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + PPID_FIELD_NUMBER: builtins.int + PID_FIELD_NUMBER: builtins.int + @property + def ppid(self) -> global___Integer: ... + @property + def pid(self) -> global___Integer: ... + def __init__( + self, + *, + ppid: global___Integer | None = ..., + pid: global___Integer | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["pid", b"pid", "ppid", b"ppid"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["pid", b"pid", "ppid", b"ppid"]) -> None: ... + +global___Ppid_Pid = Ppid_Pid + +@typing_extensions.final +class Ppid_Pid_Tid(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + PPID_FIELD_NUMBER: builtins.int + PID_FIELD_NUMBER: builtins.int + TID_FIELD_NUMBER: builtins.int + @property + def ppid(self) -> global___Integer: ... + @property + def pid(self) -> global___Integer: ... + @property + def tid(self) -> global___Integer: ... + def __init__( + self, + *, + ppid: global___Integer | None = ..., + pid: global___Integer | None = ..., + tid: global___Integer | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["pid", b"pid", "ppid", b"ppid", "tid", b"tid"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["pid", b"pid", "ppid", b"ppid", "tid", b"tid"]) -> None: ... + +global___Ppid_Pid_Tid = Ppid_Pid_Tid + +@typing_extensions.final +class Ppid_Pid_Tid_Id(google.protobuf.message.Message): + DESCRIPTOR: google.protobuf.descriptor.Descriptor + + PPID_FIELD_NUMBER: builtins.int + PID_FIELD_NUMBER: builtins.int + TID_FIELD_NUMBER: builtins.int + ID_FIELD_NUMBER: builtins.int + @property + def ppid(self) -> global___Integer: ... + @property + def pid(self) -> global___Integer: ... + @property + def tid(self) -> global___Integer: ... + @property + def id(self) -> global___Integer: ... + def __init__( + self, + *, + ppid: global___Integer | None = ..., + pid: global___Integer | None = ..., + tid: global___Integer | None = ..., + id: global___Integer | None = ..., + ) -> None: ... + def HasField(self, field_name: typing_extensions.Literal["id", b"id", "pid", b"pid", "ppid", b"ppid", "tid", b"tid"]) -> builtins.bool: ... + def ClearField(self, field_name: typing_extensions.Literal["id", b"id", "pid", b"pid", "ppid", b"ppid", "tid", b"tid"]) -> None: ... + +global___Ppid_Pid_Tid_Id = Ppid_Pid_Tid_Id + @typing_extensions.final class Integer(google.protobuf.message.Message): DESCRIPTOR: google.protobuf.descriptor.Descriptor diff --git a/capa/render/result_document.py b/capa/render/result_document.py index e8c27a49b..2ef85185e 100644 --- a/capa/render/result_document.py +++ b/capa/render/result_document.py @@ -7,10 +7,12 @@ # See the License for the specific language governing permissions and limitations under the License. import datetime import collections +from enum import Enum from typing import Dict, List, Tuple, Union, Literal, Optional from pathlib import Path from pydantic import Field, BaseModel, ConfigDict +from typing_extensions import TypeAlias import capa.rules import capa.engine @@ -47,10 +49,33 @@ class FunctionLayout(Model): matched_basic_blocks: Tuple[BasicBlockLayout, ...] -class Layout(Model): +class CallLayout(Model): + address: frz.Address + name: str + + +class ThreadLayout(Model): + address: frz.Address + matched_calls: Tuple[CallLayout, ...] + + +class ProcessLayout(Model): + address: frz.Address + name: str + matched_threads: Tuple[ThreadLayout, ...] + + +class StaticLayout(Model): functions: Tuple[FunctionLayout, ...] +class DynamicLayout(Model): + processes: Tuple[ProcessLayout, ...] + + +Layout: TypeAlias = Union[StaticLayout, DynamicLayout] + + class LibraryFunction(Model): address: frz.Address name: str @@ -61,31 +86,73 @@ class FunctionFeatureCount(Model): count: int -class FeatureCounts(Model): +class ProcessFeatureCount(Model): + address: frz.Address + count: int + + +class StaticFeatureCounts(Model): file: int functions: Tuple[FunctionFeatureCount, ...] -class Analysis(Model): +class DynamicFeatureCounts(Model): + file: int + processes: Tuple[ProcessFeatureCount, ...] + + +FeatureCounts: TypeAlias = Union[StaticFeatureCounts, DynamicFeatureCounts] + + +class StaticAnalysis(Model): format: str arch: str os: str extractor: str rules: Tuple[str, ...] base_address: frz.Address - layout: Layout - feature_counts: FeatureCounts + layout: StaticLayout + feature_counts: StaticFeatureCounts library_functions: Tuple[LibraryFunction, ...] +class DynamicAnalysis(Model): + format: str + arch: str + os: str + extractor: str + rules: Tuple[str, ...] + layout: DynamicLayout + feature_counts: DynamicFeatureCounts + + +Analysis: TypeAlias = Union[StaticAnalysis, DynamicAnalysis] + + +class Flavor(str, Enum): + STATIC = "static" + DYNAMIC = "dynamic" + + class Metadata(Model): timestamp: datetime.datetime version: str argv: Optional[Tuple[str, ...]] sample: Sample + flavor: Flavor analysis: Analysis +class StaticMetadata(Metadata): + flavor: Flavor = Flavor.STATIC + analysis: StaticAnalysis + + +class DynamicMetadata(Metadata): + flavor: Flavor = Flavor.DYNAMIC + analysis: DynamicAnalysis + + class CompoundStatementType: AND = "and" OR = "or" @@ -155,7 +222,7 @@ def statement_from_capa(node: capa.engine.Statement) -> Statement: description=node.description, min=node.min, max=node.max, - child=frz.feature_from_capa(node.child), + child=frzf.feature_from_capa(node.child), ) elif isinstance(node, capa.engine.Subscope): @@ -181,7 +248,7 @@ def node_from_capa(node: Union[capa.engine.Statement, capa.engine.Feature]) -> N return StatementNode(statement=statement_from_capa(node)) elif isinstance(node, capa.engine.Feature): - return FeatureNode(feature=frz.feature_from_capa(node)) + return FeatureNode(feature=frzf.feature_from_capa(node)) else: assert_never(node) @@ -308,9 +375,11 @@ def from_capa( # e.g. `contain loop/30c4c78e29bf4d54894fc74f664c62e8` -> `basic block` # # note! replace `node` + # subscopes cannot have both a static and dynamic scope set + assert None in (rule.scopes.static, rule.scopes.dynamic) node = StatementNode( statement=SubscopeStatement( - scope=rule.meta["scope"], + scope=rule.scopes.static or rule.scopes.dynamic, ) ) @@ -505,7 +574,7 @@ class RuleMetadata(FrozenModel): name: str namespace: Optional[str] = None authors: Tuple[str, ...] - scope: capa.rules.Scope + scopes: capa.rules.Scopes attack: Tuple[AttackSpec, ...] = Field(alias="att&ck") mbc: Tuple[MBCSpec, ...] references: Tuple[str, ...] @@ -522,7 +591,7 @@ def from_capa(cls, rule: capa.rules.Rule) -> "RuleMetadata": name=rule.meta.get("name"), namespace=rule.meta.get("namespace"), authors=rule.meta.get("authors"), - scope=capa.rules.Scope(rule.meta.get("scope")), + scopes=capa.rules.Scopes.from_dict(rule.meta.get("scopes")), attack=tuple(map(AttackSpec.from_str, rule.meta.get("att&ck", []))), mbc=tuple(map(MBCSpec.from_str, rule.meta.get("mbc", []))), references=rule.meta.get("references", []), diff --git a/capa/render/utils.py b/capa/render/utils.py index fb3932340..642b45a3b 100644 --- a/capa/render/utils.py +++ b/capa/render/utils.py @@ -24,6 +24,11 @@ def bold2(s: str) -> str: return termcolor.colored(s, "green") +def mute(s: str) -> str: + """draw attention away from the given string""" + return termcolor.colored(s, "dark_grey") + + def warn(s: str) -> str: return termcolor.colored(s, "yellow") diff --git a/capa/render/verbose.py b/capa/render/verbose.py index c3ec24425..f6f566dec 100644 --- a/capa/render/verbose.py +++ b/capa/render/verbose.py @@ -22,7 +22,7 @@ is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. """ -import enum +from typing import cast import tabulate @@ -54,13 +54,92 @@ def format_address(address: frz.Address) -> str: assert isinstance(token, int) assert isinstance(offset, int) return f"token({capa.helpers.hex(token)})+{capa.helpers.hex(offset)}" + elif address.type == frz.AddressType.PROCESS: + assert isinstance(address.value, tuple) + ppid, pid = address.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + return f"process{{pid:{pid}}}" + elif address.type == frz.AddressType.THREAD: + assert isinstance(address.value, tuple) + ppid, pid, tid = address.value + assert isinstance(ppid, int) + assert isinstance(pid, int) + assert isinstance(tid, int) + return f"process{{pid:{pid},tid:{tid}}}" + elif address.type == frz.AddressType.CALL: + assert isinstance(address.value, tuple) + ppid, pid, tid, id_ = address.value + return f"process{{pid:{pid},tid:{tid},call:{id_}}}" elif address.type == frz.AddressType.NO_ADDRESS: return "global" else: raise ValueError("unexpected address type") -def render_meta(ostream, doc: rd.ResultDocument): +def _get_process_name(layout: rd.DynamicLayout, addr: frz.Address) -> str: + for p in layout.processes: + if p.address == addr: + return p.name + + raise ValueError("name not found for process", addr) + + +def _get_call_name(layout: rd.DynamicLayout, addr: frz.Address) -> str: + call = addr.to_capa() + assert isinstance(call, capa.features.address.DynamicCallAddress) + + thread = frz.Address.from_capa(call.thread) + process = frz.Address.from_capa(call.thread.process) + + # danger: O(n**3) + for p in layout.processes: + if p.address == process: + for t in p.matched_threads: + if t.address == thread: + for c in t.matched_calls: + if c.address == addr: + return c.name + raise ValueError("name not found for call", addr) + + +def render_process(layout: rd.DynamicLayout, addr: frz.Address) -> str: + process = addr.to_capa() + assert isinstance(process, capa.features.address.ProcessAddress) + name = _get_process_name(layout, addr) + return f"{name}{{pid:{process.pid}}}" + + +def render_thread(layout: rd.DynamicLayout, addr: frz.Address) -> str: + thread = addr.to_capa() + assert isinstance(thread, capa.features.address.ThreadAddress) + name = _get_process_name(layout, frz.Address.from_capa(thread.process)) + return f"{name}{{pid:{thread.process.pid},tid:{thread.tid}}}" + + +def render_call(layout: rd.DynamicLayout, addr: frz.Address) -> str: + call = addr.to_capa() + assert isinstance(call, capa.features.address.DynamicCallAddress) + + pname = _get_process_name(layout, frz.Address.from_capa(call.thread.process)) + cname = _get_call_name(layout, addr) + + fname, _, rest = cname.partition("(") + args, _, rest = rest.rpartition(")") + + s = [] + s.append(f"{fname}(") + for arg in args.split(", "): + s.append(f" {arg},") + s.append(f"){rest}") + + newline = "\n" + return ( + f"{pname}{{pid:{call.thread.process.pid},tid:{call.thread.tid},call:{call.id}}}\n{rutils.mute(newline.join(s))}" + ) + + +def render_static_meta(ostream, meta: rd.StaticMetadata): """ like: @@ -73,36 +152,90 @@ def render_meta(ostream, doc: rd.ResultDocument): os windows format pe arch amd64 + analysis static extractor VivisectFeatureExtractor base address 0x10000000 rules (embedded rules) function count 42 total feature count 1918 """ + + rows = [ + ("md5", meta.sample.md5), + ("sha1", meta.sample.sha1), + ("sha256", meta.sample.sha256), + ("path", meta.sample.path), + ("timestamp", meta.timestamp), + ("capa version", meta.version), + ("os", meta.analysis.os), + ("format", meta.analysis.format), + ("arch", meta.analysis.arch), + ("analysis", meta.flavor.value), + ("extractor", meta.analysis.extractor), + ("base address", format_address(meta.analysis.base_address)), + ("rules", "\n".join(meta.analysis.rules)), + ("function count", len(meta.analysis.feature_counts.functions)), + ("library function count", len(meta.analysis.library_functions)), + ( + "total feature count", + meta.analysis.feature_counts.file + sum(f.count for f in meta.analysis.feature_counts.functions), + ), + ] + + ostream.writeln(tabulate.tabulate(rows, tablefmt="plain")) + + +def render_dynamic_meta(ostream, meta: rd.DynamicMetadata): + """ + like: + + md5 84882c9d43e23d63b82004fae74ebb61 + sha1 c6fb3b50d946bec6f391aefa4e54478cf8607211 + sha256 5eced7367ed63354b4ed5c556e2363514293f614c2c2eb187273381b2ef5f0f9 + path /tmp/packed-report,jspn + timestamp 2023-07-17T10:17:05.796933 + capa version 0.0.0 + os windows + format pe + arch amd64 + extractor CAPEFeatureExtractor + rules (embedded rules) + process count 42 + total feature count 1918 + """ + rows = [ - ("md5", doc.meta.sample.md5), - ("sha1", doc.meta.sample.sha1), - ("sha256", doc.meta.sample.sha256), - ("path", doc.meta.sample.path), - ("timestamp", doc.meta.timestamp), - ("capa version", doc.meta.version), - ("os", doc.meta.analysis.os), - ("format", doc.meta.analysis.format), - ("arch", doc.meta.analysis.arch), - ("extractor", doc.meta.analysis.extractor), - ("base address", format_address(doc.meta.analysis.base_address)), - ("rules", "\n".join(doc.meta.analysis.rules)), - ("function count", len(doc.meta.analysis.feature_counts.functions)), - ("library function count", len(doc.meta.analysis.library_functions)), + ("md5", meta.sample.md5), + ("sha1", meta.sample.sha1), + ("sha256", meta.sample.sha256), + ("path", meta.sample.path), + ("timestamp", meta.timestamp), + ("capa version", meta.version), + ("os", meta.analysis.os), + ("format", meta.analysis.format), + ("arch", meta.analysis.arch), + ("analysis", meta.flavor.value), + ("extractor", meta.analysis.extractor), + ("rules", "\n".join(meta.analysis.rules)), + ("process count", len(meta.analysis.feature_counts.processes)), ( "total feature count", - doc.meta.analysis.feature_counts.file + sum(f.count for f in doc.meta.analysis.feature_counts.functions), + meta.analysis.feature_counts.file + sum(p.count for p in meta.analysis.feature_counts.processes), ), ] ostream.writeln(tabulate.tabulate(rows, tablefmt="plain")) +def render_meta(osstream, doc: rd.ResultDocument): + if doc.meta.flavor == rd.Flavor.STATIC: + render_static_meta(osstream, cast(rd.StaticMetadata, doc.meta)) + elif doc.meta.flavor == rd.Flavor.DYNAMIC: + render_dynamic_meta(osstream, cast(rd.DynamicMetadata, doc.meta)) + else: + raise ValueError("invalid meta analysis") + + def render_rules(ostream, doc: rd.ResultDocument): """ like: @@ -126,22 +259,55 @@ def render_rules(ostream, doc: rd.ResultDocument): had_match = True rows = [] - for key in ("namespace", "description", "scope"): - v = getattr(rule.meta, key) - if not v: - continue - if isinstance(v, list) and len(v) == 1: - v = v[0] + ns = rule.meta.namespace + if ns: + rows.append(("namespace", ns)) - if isinstance(v, enum.Enum): - v = v.value + desc = rule.meta.description + if desc: + rows.append(("description", desc)) - rows.append((key, v)) + if doc.meta.flavor == rd.Flavor.STATIC: + scope = rule.meta.scopes.static + elif doc.meta.flavor == rd.Flavor.DYNAMIC: + scope = rule.meta.scopes.dynamic + else: + raise ValueError("invalid meta analysis") + if scope: + rows.append(("scope", scope.value)) - if rule.meta.scope != capa.rules.FILE_SCOPE: + if capa.rules.Scope.FILE not in rule.meta.scopes: locations = [m[0] for m in doc.rules[rule.meta.name].matches] - rows.append(("matches", "\n".join(map(format_address, locations)))) + lines = [] + + if doc.meta.flavor == rd.Flavor.STATIC: + lines = [format_address(loc) for loc in locations] + elif doc.meta.flavor == rd.Flavor.DYNAMIC: + assert rule.meta.scopes.dynamic is not None + assert isinstance(doc.meta.analysis.layout, rd.DynamicLayout) + + if rule.meta.scopes.dynamic == capa.rules.Scope.PROCESS: + lines = [render_process(doc.meta.analysis.layout, loc) for loc in locations] + elif rule.meta.scopes.dynamic == capa.rules.Scope.THREAD: + lines = [render_thread(doc.meta.analysis.layout, loc) for loc in locations] + elif rule.meta.scopes.dynamic == capa.rules.Scope.CALL: + # because we're only in verbose mode, we won't show the full call details (name, args, retval) + # we'll only show the details of the thread in which the calls are found. + # so select the thread locations and render those. + thread_locations = set() + for loc in locations: + cloc = loc.to_capa() + assert isinstance(cloc, capa.features.address.DynamicCallAddress) + thread_locations.add(frz.Address.from_capa(cloc.thread)) + + lines = [render_thread(doc.meta.analysis.layout, loc) for loc in thread_locations] + else: + capa.helpers.assert_never(rule.meta.scopes.dynamic) + else: + capa.helpers.assert_never(doc.meta.flavor) + + rows.append(("matches", "\n".join(lines))) ostream.writeln(tabulate.tabulate(rows, tablefmt="plain")) ostream.write("\n") diff --git a/capa/render/vverbose.py b/capa/render/vverbose.py index 03ff8c843..3498d24b8 100644 --- a/capa/render/vverbose.py +++ b/capa/render/vverbose.py @@ -5,7 +5,8 @@ # Unless required by applicable law or agreed to in writing, software distributed under the License # is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and limitations under the License. - +import logging +import textwrap from typing import Dict, Iterable, Optional import tabulate @@ -22,8 +23,29 @@ from capa.rules import RuleSet from capa.engine import MatchResults +logger = logging.getLogger(__name__) + + +def hanging_indent(s: str, indent: int) -> str: + """ + indent the given string, except the first line, + such as if the string finishes an existing line. + + e.g., + + EXISTINGSTUFFHERE + hanging_indent("xxxx...", 1) + + becomes: -def render_locations(ostream, locations: Iterable[frz.Address]): + EXISTINGSTUFFHERExxxxx + xxxxxx + xxxxxx + """ + prefix = " " * indent + return textwrap.indent(s, prefix=prefix)[len(prefix) :] + + +def render_locations(ostream, layout: rd.Layout, locations: Iterable[frz.Address], indent: int): import capa.render.verbose as v # its possible to have an empty locations array here, @@ -35,9 +57,23 @@ def render_locations(ostream, locations: Iterable[frz.Address]): return ostream.write(" @ ") + location0 = locations[0] if len(locations) == 1: - ostream.write(v.format_address(locations[0])) + location = locations[0] + + if location.type == frz.AddressType.CALL: + assert isinstance(layout, rd.DynamicLayout) + ostream.write(hanging_indent(v.render_call(layout, location), indent + 1)) + else: + ostream.write(v.format_address(locations[0])) + + elif location0.type == frz.AddressType.CALL and len(locations) > 1: + location = locations[0] + + assert isinstance(layout, rd.DynamicLayout) + s = f"{v.render_call(layout, location)}\nand {(len(locations) - 1)} more..." + ostream.write(hanging_indent(s, indent + 1)) elif len(locations) > 4: # don't display too many locations, because it becomes very noisy. @@ -52,7 +88,7 @@ def render_locations(ostream, locations: Iterable[frz.Address]): raise RuntimeError("unreachable") -def render_statement(ostream, match: rd.Match, statement: rd.Statement, indent=0): +def render_statement(ostream, layout: rd.Layout, match: rd.Match, statement: rd.Statement, indent: int): ostream.write(" " * indent) if isinstance(statement, rd.SubscopeStatement): @@ -114,7 +150,7 @@ def render_statement(ostream, match: rd.Match, statement: rd.Statement, indent=0 if statement.description: ostream.write(f" = {statement.description}") - render_locations(ostream, match.locations) + render_locations(ostream, layout, match.locations, indent) ostream.writeln("") else: @@ -125,7 +161,9 @@ def render_string_value(s: str) -> str: return f'"{capa.features.common.escape_string(s)}"' -def render_feature(ostream, match: rd.Match, feature: frzf.Feature, indent=0): +def render_feature( + ostream, layout: rd.Layout, rule: rd.RuleMatches, match: rd.Match, feature: frzf.Feature, indent: int +): ostream.write(" " * indent) key = feature.type @@ -176,8 +214,17 @@ def render_feature(ostream, match: rd.Match, feature: frzf.Feature, indent=0): ostream.write(capa.rules.DESCRIPTION_SEPARATOR) ostream.write(feature.description) - if not isinstance(feature, (frzf.OSFeature, frzf.ArchFeature, frzf.FormatFeature)): - render_locations(ostream, match.locations) + if isinstance(feature, (frzf.OSFeature, frzf.ArchFeature, frzf.FormatFeature)): + # don't show the location of these global features + pass + elif isinstance(layout, rd.DynamicLayout) and rule.meta.scopes.dynamic == capa.rules.Scope.CALL: + # if we're in call scope, then the call will have been rendered at the top + # of the output, so don't re-render it again for each feature. + pass + elif isinstance(feature, (frzf.OSFeature, frzf.ArchFeature, frzf.FormatFeature)): + pass + else: + render_locations(ostream, layout, match.locations, indent) ostream.write("\n") else: # like: @@ -193,15 +240,19 @@ def render_feature(ostream, match: rd.Match, feature: frzf.Feature, indent=0): ostream.write(" " * (indent + 1)) ostream.write("- ") ostream.write(rutils.bold2(render_string_value(capture))) - render_locations(ostream, locations) + if isinstance(layout, rd.DynamicLayout) and rule.meta.scopes.dynamic == capa.rules.Scope.CALL: + # like above, don't re-render calls when in call scope. + pass + else: + render_locations(ostream, layout, locations, indent=indent) ostream.write("\n") -def render_node(ostream, match: rd.Match, node: rd.Node, indent=0): +def render_node(ostream, layout: rd.Layout, rule: rd.RuleMatches, match: rd.Match, node: rd.Node, indent: int): if isinstance(node, rd.StatementNode): - render_statement(ostream, match, node.statement, indent=indent) + render_statement(ostream, layout, match, node.statement, indent=indent) elif isinstance(node, rd.FeatureNode): - render_feature(ostream, match, node.feature, indent=indent) + render_feature(ostream, layout, rule, match, node.feature, indent=indent) else: raise RuntimeError("unexpected node type: " + str(node)) @@ -214,7 +265,7 @@ def render_node(ostream, match: rd.Match, node: rd.Node, indent=0): MODE_FAILURE = "failure" -def render_match(ostream, match: rd.Match, indent=0, mode=MODE_SUCCESS): +def render_match(ostream, layout: rd.Layout, rule: rd.RuleMatches, match: rd.Match, indent=0, mode=MODE_SUCCESS): child_mode = mode if mode == MODE_SUCCESS: # display only nodes that evaluated successfully. @@ -246,10 +297,10 @@ def render_match(ostream, match: rd.Match, indent=0, mode=MODE_SUCCESS): else: raise RuntimeError("unexpected mode: " + mode) - render_node(ostream, match, match.node, indent=indent) + render_node(ostream, layout, rule, match, match.node, indent=indent) for child in match.children: - render_match(ostream, child, indent=indent + 1, mode=child_mode) + render_match(ostream, layout, rule, child, indent=indent + 1, mode=child_mode) def render_rules(ostream, doc: rd.ResultDocument): @@ -260,7 +311,8 @@ def render_rules(ostream, doc: rd.ResultDocument): check for OutputDebugString error namespace anti-analysis/anti-debugging/debugger-detection author michael.hunhoff@mandiant.com - scope function + static scope: function + dynamic scope: process mbc Anti-Behavioral Analysis::Detect Debugger::OutputDebugString function @ 0x10004706 and: @@ -268,13 +320,20 @@ def render_rules(ostream, doc: rd.ResultDocument): api: kernel32.GetLastError @ 0x10004A87 api: kernel32.OutputDebugString @ 0x10004767, 0x10004787, 0x10004816, 0x10004895 """ - functions_by_bb: Dict[capa.features.address.Address, capa.features.address.Address] = {} - for finfo in doc.meta.analysis.layout.functions: - faddress = finfo.address.to_capa() + import capa.render.verbose as v - for bb in finfo.matched_basic_blocks: - bbaddress = bb.address.to_capa() - functions_by_bb[bbaddress] = faddress + functions_by_bb: Dict[capa.features.address.Address, capa.features.address.Address] = {} + if isinstance(doc.meta.analysis, rd.StaticAnalysis): + for finfo in doc.meta.analysis.layout.functions: + faddress = finfo.address.to_capa() + + for bb in finfo.matched_basic_blocks: + bbaddress = bb.address.to_capa() + functions_by_bb[bbaddress] = faddress + elif isinstance(doc.meta.analysis, rd.DynamicAnalysis): + pass + else: + raise ValueError("invalid analysis field in the document's meta") had_match = False @@ -323,7 +382,13 @@ def render_rules(ostream, doc: rd.ResultDocument): rows.append(("author", ", ".join(rule.meta.authors))) - rows.append(("scope", rule.meta.scope.value)) + if doc.meta.flavor == rd.Flavor.STATIC: + assert rule.meta.scopes.static is not None + rows.append(("scope", rule.meta.scopes.static.value)) + + if doc.meta.flavor == rd.Flavor.DYNAMIC: + assert rule.meta.scopes.dynamic is not None + rows.append(("scope", rule.meta.scopes.dynamic.value)) if rule.meta.attack: rows.append(("att&ck", ", ".join([rutils.format_parts_id(v) for v in rule.meta.attack]))) @@ -339,7 +404,7 @@ def render_rules(ostream, doc: rd.ResultDocument): ostream.writeln(tabulate.tabulate(rows, tablefmt="plain")) - if rule.meta.scope == capa.rules.FILE_SCOPE: + if capa.rules.Scope.FILE in rule.meta.scopes: matches = doc.rules[rule.meta.name].matches if len(matches) != 1: # i think there should only ever be one match per file-scope rule, @@ -347,22 +412,42 @@ def render_rules(ostream, doc: rd.ResultDocument): # but i'm not 100% sure if this is/will always be true. # so, lets be explicit about our assumptions and raise an exception if they fail. raise RuntimeError(f"unexpected file scope match count: {len(matches)}") - first_address, first_match = matches[0] - render_match(ostream, first_match, indent=0) + _, first_match = matches[0] + render_match(ostream, doc.meta.analysis.layout, rule, first_match, indent=0) else: for location, match in sorted(doc.rules[rule.meta.name].matches): - ostream.write(rule.meta.scope) - ostream.write(" @ ") - ostream.write(capa.render.verbose.format_address(location)) + if doc.meta.flavor == rd.Flavor.STATIC: + assert rule.meta.scopes.static is not None + ostream.write(rule.meta.scopes.static.value) + ostream.write(" @ ") + ostream.write(capa.render.verbose.format_address(location)) + + if rule.meta.scopes.static == capa.rules.Scope.BASIC_BLOCK: + func = frz.Address.from_capa(functions_by_bb[location.to_capa()]) + ostream.write(f" in function {capa.render.verbose.format_address(func)}") + + elif doc.meta.flavor == rd.Flavor.DYNAMIC: + assert rule.meta.scopes.dynamic is not None + assert isinstance(doc.meta.analysis.layout, rd.DynamicLayout) + + ostream.write(rule.meta.scopes.dynamic.value) + + ostream.write(" @ ") + + if rule.meta.scopes.dynamic == capa.rules.Scope.PROCESS: + ostream.write(v.render_process(doc.meta.analysis.layout, location)) + elif rule.meta.scopes.dynamic == capa.rules.Scope.THREAD: + ostream.write(v.render_thread(doc.meta.analysis.layout, location)) + elif rule.meta.scopes.dynamic == capa.rules.Scope.CALL: + ostream.write(hanging_indent(v.render_call(doc.meta.analysis.layout, location), indent=1)) + else: + capa.helpers.assert_never(rule.meta.scopes.dynamic) - if rule.meta.scope == capa.rules.BASIC_BLOCK_SCOPE: - ostream.write( - " in function " - + capa.render.verbose.format_address(frz.Address.from_capa(functions_by_bb[location.to_capa()])) - ) + else: + capa.helpers.assert_never(doc.meta.flavor) ostream.write("\n") - render_match(ostream, match, indent=1) + render_match(ostream, doc.meta.analysis.layout, rule, match, indent=1) if rule.meta.lib: # only show first match break diff --git a/capa/rules/__init__.py b/capa/rules/__init__.py index 9e39379b7..be04ec557 100644 --- a/capa/rules/__init__.py +++ b/capa/rules/__init__.py @@ -28,6 +28,7 @@ from backports.functools_lru_cache import lru_cache # type: ignore from typing import Any, Set, Dict, List, Tuple, Union, Iterator, Optional +from dataclasses import asdict, dataclass import yaml import pydantic @@ -61,7 +62,7 @@ "authors", "description", "lib", - "scope", + "scopes", "att&ck", "mbc", "references", @@ -76,28 +77,113 @@ class Scope(str, Enum): FILE = "file" + PROCESS = "process" + THREAD = "thread" + CALL = "call" FUNCTION = "function" BASIC_BLOCK = "basic block" INSTRUCTION = "instruction" + # used only to specify supported features per scope. + # not used to validate rules. + GLOBAL = "global" -FILE_SCOPE = Scope.FILE.value -FUNCTION_SCOPE = Scope.FUNCTION.value -BASIC_BLOCK_SCOPE = Scope.BASIC_BLOCK.value -INSTRUCTION_SCOPE = Scope.INSTRUCTION.value -# used only to specify supported features per scope. -# not used to validate rules. -GLOBAL_SCOPE = "global" + @classmethod + def to_yaml(cls, representer, node): + return representer.represent_str(f"{node.value}") + + +# these literals are used to check if the flavor +# of a rule is correct. +STATIC_SCOPES = { + Scope.FILE, + Scope.GLOBAL, + Scope.FUNCTION, + Scope.BASIC_BLOCK, + Scope.INSTRUCTION, +} +DYNAMIC_SCOPES = { + Scope.FILE, + Scope.GLOBAL, + Scope.PROCESS, + Scope.THREAD, + Scope.CALL, +} + + +@dataclass +class Scopes: + # when None, the scope is not supported by a rule + static: Optional[Scope] = None + # when None, the scope is not supported by a rule + dynamic: Optional[Scope] = None + + def __contains__(self, scope: Scope) -> bool: + return (scope == self.static) or (scope == self.dynamic) + + def __repr__(self) -> str: + if self.static and self.dynamic: + return f"static-scope: {self.static}, dynamic-scope: {self.dynamic}" + elif self.static: + return f"static-scope: {self.static}" + elif self.dynamic: + return f"dynamic-scope: {self.dynamic}" + else: + raise ValueError("invalid rules class. at least one scope must be specified") + + @classmethod + def from_dict(self, scopes: Dict[str, str]) -> "Scopes": + # make local copy so we don't make changes outside of this routine. + # we'll use the value None to indicate the scope is not supported. + scopes_: Dict[str, Optional[str]] = dict(scopes) + + # mark non-specified scopes as invalid + if "static" not in scopes_: + raise InvalidRule("static scope must be provided") + if "dynamic" not in scopes_: + raise InvalidRule("dynamic scope must be provided") + + # check the syntax of the meta `scopes` field + if sorted(scopes_) != ["dynamic", "static"]: + raise InvalidRule("scope flavors can be either static or dynamic") + + if scopes_["static"] == "unsupported": + scopes_["static"] = None + if scopes_["dynamic"] == "unsupported": + scopes_["dynamic"] = None + + # unspecified is used to indicate a rule is yet to be migrated. + # TODO(williballenthin): this scope term should be removed once all rules have been migrated. + # https://github.com/mandiant/capa/issues/1747 + if scopes_["static"] == "unspecified": + scopes_["static"] = None + if scopes_["dynamic"] == "unspecified": + scopes_["dynamic"] = None + + if (not scopes_["static"]) and (not scopes_["dynamic"]): + raise InvalidRule("invalid scopes value. At least one scope must be specified") + + # check that all the specified scopes are valid + if scopes_["static"] and scopes_["static"] not in STATIC_SCOPES: + raise InvalidRule(f"{scopes_['static']} is not a valid static scope") + + if scopes_["dynamic"] and scopes_["dynamic"] not in DYNAMIC_SCOPES: + raise InvalidRule(f"{scopes_['dynamic']} is not a valid dynamic scope") + + return Scopes( + static=Scope(scopes_["static"]) if scopes_["static"] else None, + dynamic=Scope(scopes_["dynamic"]) if scopes_["dynamic"] else None, + ) SUPPORTED_FEATURES: Dict[str, Set] = { - GLOBAL_SCOPE: { + Scope.GLOBAL: { # these will be added to other scopes, see below. capa.features.common.OS, capa.features.common.Arch, capa.features.common.Format, }, - FILE_SCOPE: { + Scope.FILE: { capa.features.common.MatchedRule, capa.features.file.Export, capa.features.file.Import, @@ -110,7 +196,19 @@ class Scope(str, Enum): capa.features.common.Characteristic("mixed mode"), capa.features.common.Characteristic("forwarded export"), }, - FUNCTION_SCOPE: { + Scope.PROCESS: { + capa.features.common.MatchedRule, + }, + Scope.THREAD: set(), + Scope.CALL: { + capa.features.common.MatchedRule, + capa.features.common.Regex, + capa.features.common.String, + capa.features.common.Substring, + capa.features.insn.API, + capa.features.insn.Number, + }, + Scope.FUNCTION: { capa.features.common.MatchedRule, capa.features.basicblock.BasicBlock, capa.features.common.Characteristic("calls from"), @@ -119,13 +217,13 @@ class Scope(str, Enum): capa.features.common.Characteristic("recursive call"), # plus basic block scope features, see below }, - BASIC_BLOCK_SCOPE: { + Scope.BASIC_BLOCK: { capa.features.common.MatchedRule, capa.features.common.Characteristic("tight loop"), capa.features.common.Characteristic("stack string"), # plus instruction scope features, see below }, - INSTRUCTION_SCOPE: { + Scope.INSTRUCTION: { capa.features.common.MatchedRule, capa.features.insn.API, capa.features.insn.Property, @@ -150,15 +248,24 @@ class Scope(str, Enum): } # global scope features are available in all other scopes -SUPPORTED_FEATURES[INSTRUCTION_SCOPE].update(SUPPORTED_FEATURES[GLOBAL_SCOPE]) -SUPPORTED_FEATURES[BASIC_BLOCK_SCOPE].update(SUPPORTED_FEATURES[GLOBAL_SCOPE]) -SUPPORTED_FEATURES[FUNCTION_SCOPE].update(SUPPORTED_FEATURES[GLOBAL_SCOPE]) -SUPPORTED_FEATURES[FILE_SCOPE].update(SUPPORTED_FEATURES[GLOBAL_SCOPE]) +SUPPORTED_FEATURES[Scope.INSTRUCTION].update(SUPPORTED_FEATURES[Scope.GLOBAL]) +SUPPORTED_FEATURES[Scope.BASIC_BLOCK].update(SUPPORTED_FEATURES[Scope.GLOBAL]) +SUPPORTED_FEATURES[Scope.FUNCTION].update(SUPPORTED_FEATURES[Scope.GLOBAL]) +SUPPORTED_FEATURES[Scope.FILE].update(SUPPORTED_FEATURES[Scope.GLOBAL]) +SUPPORTED_FEATURES[Scope.PROCESS].update(SUPPORTED_FEATURES[Scope.GLOBAL]) +SUPPORTED_FEATURES[Scope.THREAD].update(SUPPORTED_FEATURES[Scope.GLOBAL]) +SUPPORTED_FEATURES[Scope.CALL].update(SUPPORTED_FEATURES[Scope.GLOBAL]) + + +# all call scope features are also thread features +SUPPORTED_FEATURES[Scope.THREAD].update(SUPPORTED_FEATURES[Scope.CALL]) +# all thread scope features are also process features +SUPPORTED_FEATURES[Scope.PROCESS].update(SUPPORTED_FEATURES[Scope.THREAD]) # all instruction scope features are also basic block features -SUPPORTED_FEATURES[BASIC_BLOCK_SCOPE].update(SUPPORTED_FEATURES[INSTRUCTION_SCOPE]) +SUPPORTED_FEATURES[Scope.BASIC_BLOCK].update(SUPPORTED_FEATURES[Scope.INSTRUCTION]) # all basic block scope features are also function scope features -SUPPORTED_FEATURES[FUNCTION_SCOPE].update(SUPPORTED_FEATURES[BASIC_BLOCK_SCOPE]) +SUPPORTED_FEATURES[Scope.FUNCTION].update(SUPPORTED_FEATURES[Scope.BASIC_BLOCK]) class InvalidRule(ValueError): @@ -196,6 +303,31 @@ def __repr__(self): return str(self) +def ensure_feature_valid_for_scopes(scopes: Scopes, feature: Union[Feature, Statement]): + # construct a dict of all supported features + supported_features: Set = set() + if scopes.static: + supported_features.update(SUPPORTED_FEATURES[scopes.static]) + if scopes.dynamic: + supported_features.update(SUPPORTED_FEATURES[scopes.dynamic]) + + # if the given feature is a characteristic, + # check that is a valid characteristic for the given scope. + if ( + isinstance(feature, capa.features.common.Characteristic) + and isinstance(feature.value, str) + and capa.features.common.Characteristic(feature.value) not in supported_features + ): + raise InvalidRule(f"feature {feature} not supported for scopes {scopes}") + + if not isinstance(feature, capa.features.common.Characteristic): + # features of this scope that are not Characteristics will be Type instances. + # check that the given feature is one of these types. + types_for_scope = filter(lambda t: isinstance(t, type), supported_features) + if not isinstance(feature, tuple(types_for_scope)): + raise InvalidRule(f"feature {feature} not supported for scopes {scopes}") + + class ComType(Enum): CLASS = "class" INTERFACE = "interface" @@ -258,24 +390,6 @@ def translate_com_feature(com_name: str, com_type: ComType) -> ceng.Or: return ceng.Or(com_features) -def ensure_feature_valid_for_scope(scope: str, feature: Union[Feature, Statement]): - # if the given feature is a characteristic, - # check that is a valid characteristic for the given scope. - if ( - isinstance(feature, capa.features.common.Characteristic) - and isinstance(feature.value, str) - and capa.features.common.Characteristic(feature.value) not in SUPPORTED_FEATURES[scope] - ): - raise InvalidRule(f"feature {feature} not supported for scope {scope}") - - if not isinstance(feature, capa.features.common.Characteristic): - # features of this scope that are not Characteristics will be Type instances. - # check that the given feature is one of these types. - types_for_scope = filter(lambda t: isinstance(t, type), SUPPORTED_FEATURES[scope]) - if not isinstance(feature, tuple(types_for_scope)): # type: ignore - raise InvalidRule(f"feature {feature} not supported for scope {scope}") - - def parse_int(s: str) -> int: if s.startswith("0x"): return int(s, 0x10) @@ -481,53 +595,97 @@ def pop_statement_description_entry(d): return description["description"] -def build_statements(d, scope: str): +def trim_dll_part(api: str) -> str: + # kernel32.CreateFileA + if api.count(".") == 1: + api = api.split(".")[1] + return api + + +def build_statements(d, scopes: Scopes): if len(d.keys()) > 2: raise InvalidRule("too many statements") key = list(d.keys())[0] description = pop_statement_description_entry(d[key]) if key == "and": - return ceng.And([build_statements(dd, scope) for dd in d[key]], description=description) + return ceng.And([build_statements(dd, scopes) for dd in d[key]], description=description) elif key == "or": - return ceng.Or([build_statements(dd, scope) for dd in d[key]], description=description) + return ceng.Or([build_statements(dd, scopes) for dd in d[key]], description=description) elif key == "not": if len(d[key]) != 1: raise InvalidRule("not statement must have exactly one child statement") - return ceng.Not(build_statements(d[key][0], scope), description=description) + return ceng.Not(build_statements(d[key][0], scopes), description=description) elif key.endswith(" or more"): count = int(key[: -len("or more")]) - return ceng.Some(count, [build_statements(dd, scope) for dd in d[key]], description=description) + return ceng.Some(count, [build_statements(dd, scopes) for dd in d[key]], description=description) elif key == "optional": # `optional` is an alias for `0 or more` # which is useful for documenting behaviors, # like with `write file`, we might say that `WriteFile` is optionally found alongside `CreateFileA`. - return ceng.Some(0, [build_statements(dd, scope) for dd in d[key]], description=description) + return ceng.Some(0, [build_statements(dd, scopes) for dd in d[key]], description=description) + + elif key == "process": + if Scope.FILE not in scopes: + raise InvalidRule("process subscope supported only for file scope") + + if len(d[key]) != 1: + raise InvalidRule("subscope must have exactly one child statement") + + return ceng.Subscope( + Scope.PROCESS, build_statements(d[key][0], Scopes(dynamic=Scope.PROCESS)), description=description + ) + + elif key == "thread": + if all(s not in scopes for s in (Scope.FILE, Scope.PROCESS)): + raise InvalidRule("thread subscope supported only for the process scope") + + if len(d[key]) != 1: + raise InvalidRule("subscope must have exactly one child statement") + + return ceng.Subscope( + Scope.THREAD, build_statements(d[key][0], Scopes(dynamic=Scope.THREAD)), description=description + ) + + elif key == "call": + if all(s not in scopes for s in (Scope.FILE, Scope.PROCESS, Scope.THREAD)): + raise InvalidRule("call subscope supported only for the process and thread scopes") + + if len(d[key]) != 1: + raise InvalidRule("subscope must have exactly one child statement") + + return ceng.Subscope( + Scope.CALL, build_statements(d[key][0], Scopes(dynamic=Scope.CALL)), description=description + ) elif key == "function": - if scope != FILE_SCOPE: + if Scope.FILE not in scopes: raise InvalidRule("function subscope supported only for file scope") if len(d[key]) != 1: raise InvalidRule("subscope must have exactly one child statement") - return ceng.Subscope(FUNCTION_SCOPE, build_statements(d[key][0], FUNCTION_SCOPE), description=description) + return ceng.Subscope( + Scope.FUNCTION, build_statements(d[key][0], Scopes(static=Scope.FUNCTION)), description=description + ) elif key == "basic block": - if scope != FUNCTION_SCOPE: + if Scope.FUNCTION not in scopes: raise InvalidRule("basic block subscope supported only for function scope") if len(d[key]) != 1: raise InvalidRule("subscope must have exactly one child statement") - return ceng.Subscope(BASIC_BLOCK_SCOPE, build_statements(d[key][0], BASIC_BLOCK_SCOPE), description=description) + return ceng.Subscope( + Scope.BASIC_BLOCK, build_statements(d[key][0], Scopes(static=Scope.BASIC_BLOCK)), description=description + ) elif key == "instruction": - if scope not in (FUNCTION_SCOPE, BASIC_BLOCK_SCOPE): + if all(s not in scopes for s in (Scope.FUNCTION, Scope.BASIC_BLOCK)): raise InvalidRule("instruction subscope supported only for function and basic block scope") if len(d[key]) == 1: - statements = build_statements(d[key][0], INSTRUCTION_SCOPE) + statements = build_statements(d[key][0], Scopes(static=Scope.INSTRUCTION)) else: # for instruction subscopes, we support a shorthand in which the top level AND is implied. # the following are equivalent: @@ -541,9 +699,9 @@ def build_statements(d, scope: str): # - arch: i386 # - mnemonic: cmp # - statements = ceng.And([build_statements(dd, INSTRUCTION_SCOPE) for dd in d[key]]) + statements = ceng.And([build_statements(dd, Scopes(static=Scope.INSTRUCTION)) for dd in d[key]]) - return ceng.Subscope(INSTRUCTION_SCOPE, statements, description=description) + return ceng.Subscope(Scope.INSTRUCTION, statements, description=description) elif key.startswith("count(") and key.endswith(")"): # e.g.: @@ -571,6 +729,10 @@ def build_statements(d, scope: str): # count(number(0x100 = description)) if term != "string": value, description = parse_description(arg, term) + + if term == "api": + value = trim_dll_part(value) + feature = Feature(value, description=description) else: # arg is string (which doesn't support inline descriptions), like: @@ -582,7 +744,7 @@ def build_statements(d, scope: str): feature = Feature(arg) else: feature = Feature() - ensure_feature_valid_for_scope(scope, feature) + ensure_feature_valid_for_scopes(scopes, feature) count = d[key] if isinstance(count, int): @@ -616,7 +778,7 @@ def build_statements(d, scope: str): feature = capa.features.insn.OperandNumber(index, value, description=description) except ValueError as e: raise InvalidRule(str(e)) from e - ensure_feature_valid_for_scope(scope, feature) + ensure_feature_valid_for_scopes(scopes, feature) return feature elif key.startswith("operand[") and key.endswith("].offset"): @@ -632,7 +794,7 @@ def build_statements(d, scope: str): feature = capa.features.insn.OperandOffset(index, value, description=description) except ValueError as e: raise InvalidRule(str(e)) from e - ensure_feature_valid_for_scope(scope, feature) + ensure_feature_valid_for_scopes(scopes, feature) return feature elif ( @@ -652,7 +814,7 @@ def build_statements(d, scope: str): feature = capa.features.insn.Property(value, access=access, description=description) except ValueError as e: raise InvalidRule(str(e)) from e - ensure_feature_valid_for_scope(scope, feature) + ensure_feature_valid_for_scopes(scopes, feature) return feature elif key.startswith("com/"): @@ -665,11 +827,15 @@ def build_statements(d, scope: str): else: Feature = parse_feature(key) value, description = parse_description(d[key], key, d.get("description")) + + if key == "api": + value = trim_dll_part(value) + try: feature = Feature(value, description=description) except ValueError as e: raise InvalidRule(str(e)) from e - ensure_feature_valid_for_scope(scope, feature) + ensure_feature_valid_for_scopes(scopes, feature) return feature @@ -682,10 +848,10 @@ def second(s: List[Any]) -> Any: class Rule: - def __init__(self, name: str, scope: str, statement: Statement, meta, definition=""): + def __init__(self, name: str, scopes: Scopes, statement: Statement, meta, definition=""): super().__init__() self.name = name - self.scope = scope + self.scopes = scopes self.statement = statement self.meta = meta self.definition = definition @@ -694,7 +860,7 @@ def __str__(self): return f"Rule(name={self.name})" def __repr__(self): - return f"Rule(scope={self.scope}, name={self.name})" + return f"Rule(scope={self.scopes}, name={self.name})" def get_dependencies(self, namespaces): """ @@ -752,13 +918,19 @@ def _extract_subscope_rules_rec(self, statement): # the name is a randomly generated, hopefully unique value. # ideally, this won't every be rendered to a user. name = self.name + "/" + uuid.uuid4().hex + if subscope.scope in STATIC_SCOPES: + scopes = Scopes(static=subscope.scope) + elif subscope.scope in DYNAMIC_SCOPES: + scopes = Scopes(dynamic=subscope.scope) + else: + raise InvalidRule(f"scope {subscope.scope} is not a valid subscope") new_rule = Rule( name, - subscope.scope, + scopes, subscope.child, { "name": name, - "scope": subscope.scope, + "scopes": asdict(scopes), # these derived rules are never meant to be inspected separately, # they are dependencies for the parent rule, # so mark it as such. @@ -783,6 +955,9 @@ def _extract_subscope_rules_rec(self, statement): for child in statement.get_children(): yield from self._extract_subscope_rules_rec(child) + def is_file_limitation_rule(self) -> bool: + return self.meta.get("namespace", "") == "internal/limitation/file" + def is_subscope_rule(self): return bool(self.meta.get("capa/subscope-rule", False)) @@ -845,9 +1020,21 @@ def evaluate(self, features: FeatureSet, short_circuit=True): def from_dict(cls, d: Dict[str, Any], definition: str) -> "Rule": meta = d["rule"]["meta"] name = meta["name"] + # if scope is not specified, default to function scope. # this is probably the mode that rule authors will start with. - scope = meta.get("scope", FUNCTION_SCOPE) + # each rule has two scopes, a static-flavor scope, and a + # dynamic-flavor one. which one is used depends on the analysis type. + if "scope" in meta: + raise InvalidRule(f"legacy rule detected (rule.meta.scope), please update to the new syntax: {name}") + elif "scopes" in meta: + scopes_ = meta.get("scopes") + else: + raise InvalidRule("please specify at least one of this rule's (static/dynamic) scopes") + if not isinstance(scopes_, dict): + raise InvalidRule("the scopes field must contain a dictionary specifying the scopes") + + scopes: Scopes = Scopes.from_dict(scopes_) statements = d["rule"]["features"] # the rule must start with a single logic node. @@ -858,16 +1045,13 @@ def from_dict(cls, d: Dict[str, Any], definition: str) -> "Rule": if isinstance(statements[0], ceng.Subscope): raise InvalidRule("top level statement may not be a subscope") - if scope not in SUPPORTED_FEATURES.keys(): - raise InvalidRule("{:s} is not a supported scope".format(scope)) - meta = d["rule"]["meta"] if not isinstance(meta.get("att&ck", []), list): raise InvalidRule("ATT&CK mapping must be a list") if not isinstance(meta.get("mbc", []), list): raise InvalidRule("MBC mapping must be a list") - return cls(name, scope, build_statements(statements[0], scope), meta, definition) + return cls(name, scopes, build_statements(statements[0], scopes), meta, definition) @staticmethod @lru_cache() @@ -895,7 +1079,7 @@ def _get_ruamel_yaml_parser(): # leave quotes unchanged. # manually verified this property exists, even if mypy complains. - y.preserve_quotes = True # type: ignore + y.preserve_quotes = True # indent lists by two spaces below their parent # @@ -907,7 +1091,7 @@ def _get_ruamel_yaml_parser(): # avoid word wrapping # manually verified this property exists, even if mypy complains. - y.width = 4096 # type: ignore + y.width = 4096 return y @@ -966,10 +1150,8 @@ def to_yaml(self) -> str: del meta[k] for k, v in self.meta.items(): meta[k] = v - # the name and scope of the rule instance overrides anything in meta. meta["name"] = self.name - meta["scope"] = self.scope def move_to_end(m, k): # ruamel.yaml uses an ordereddict-like structure to track maps (CommentedMap). @@ -990,7 +1172,6 @@ def move_to_end(m, k): if key in META_KEYS: continue move_to_end(meta, key) - # save off the existing hidden meta values, # emit the document, # and re-add the hidden meta. @@ -1045,12 +1226,11 @@ def move_to_end(m, k): return doc -def get_rules_with_scope(rules, scope) -> List[Rule]: +def get_rules_with_scope(rules, scope: Scope) -> List[Rule]: """ from the given collection of rules, select those with the given scope. - `scope` is one of the capa.rules.*_SCOPE constants. """ - return [rule for rule in rules if rule.scope == scope] + return [rule for rule in rules if scope in rule.scopes] def get_rules_and_dependencies(rules: List[Rule], rule_name: str) -> Iterator[Rule]: @@ -1175,7 +1355,10 @@ class RuleSet: capa.engine.match(ruleset.file_rules, ...) """ - def __init__(self, rules: List[Rule]): + def __init__( + self, + rules: List[Rule], + ): super().__init__() ensure_rules_are_unique(rules) @@ -1197,15 +1380,23 @@ def __init__(self, rules: List[Rule]): rules = capa.optimizer.optimize_rules(rules) - self.file_rules = self._get_rules_for_scope(rules, FILE_SCOPE) - self.function_rules = self._get_rules_for_scope(rules, FUNCTION_SCOPE) - self.basic_block_rules = self._get_rules_for_scope(rules, BASIC_BLOCK_SCOPE) - self.instruction_rules = self._get_rules_for_scope(rules, INSTRUCTION_SCOPE) + self.file_rules = self._get_rules_for_scope(rules, Scope.FILE) + self.process_rules = self._get_rules_for_scope(rules, Scope.PROCESS) + self.thread_rules = self._get_rules_for_scope(rules, Scope.THREAD) + self.call_rules = self._get_rules_for_scope(rules, Scope.CALL) + self.function_rules = self._get_rules_for_scope(rules, Scope.FUNCTION) + self.basic_block_rules = self._get_rules_for_scope(rules, Scope.BASIC_BLOCK) + self.instruction_rules = self._get_rules_for_scope(rules, Scope.INSTRUCTION) self.rules = {rule.name: rule for rule in rules} self.rules_by_namespace = index_rules_by_namespace(rules) # unstable (self._easy_file_rules_by_feature, self._hard_file_rules) = self._index_rules_by_feature(self.file_rules) + (self._easy_process_rules_by_feature, self._hard_process_rules) = self._index_rules_by_feature( + self.process_rules + ) + (self._easy_thread_rules_by_feature, self._hard_thread_rules) = self._index_rules_by_feature(self.thread_rules) + (self._easy_call_rules_by_feature, self._hard_call_rules) = self._index_rules_by_feature(self.call_rules) (self._easy_function_rules_by_feature, self._hard_function_rules) = self._index_rules_by_feature( self.function_rules ) @@ -1451,16 +1642,25 @@ def match(self, scope: Scope, features: FeatureSet, addr: Address) -> Tuple[Feat except that it may be more performant. """ easy_rules_by_feature = {} - if scope is Scope.FILE: + if scope == Scope.FILE: easy_rules_by_feature = self._easy_file_rules_by_feature hard_rule_names = self._hard_file_rules - elif scope is Scope.FUNCTION: + elif scope == Scope.PROCESS: + easy_rules_by_feature = self._easy_process_rules_by_feature + hard_rule_names = self._hard_process_rules + elif scope == Scope.THREAD: + easy_rules_by_feature = self._easy_thread_rules_by_feature + hard_rule_names = self._hard_thread_rules + elif scope == Scope.CALL: + easy_rules_by_feature = self._easy_call_rules_by_feature + hard_rule_names = self._hard_call_rules + elif scope == Scope.FUNCTION: easy_rules_by_feature = self._easy_function_rules_by_feature hard_rule_names = self._hard_function_rules - elif scope is Scope.BASIC_BLOCK: + elif scope == Scope.BASIC_BLOCK: easy_rules_by_feature = self._easy_basic_block_rules_by_feature hard_rule_names = self._hard_basic_block_rules - elif scope is Scope.INSTRUCTION: + elif scope == Scope.INSTRUCTION: easy_rules_by_feature = self._easy_instruction_rules_by_feature hard_rule_names = self._hard_instruction_rules else: diff --git a/doc/installation.md b/doc/installation.md index 65258e450..57c939c2b 100644 --- a/doc/installation.md +++ b/doc/installation.md @@ -105,27 +105,28 @@ To install these development dependencies, run: We use [pre-commit](https://pre-commit.com/) so that its trivial to run the same linters & configuration locally as in CI. -Run all linters liks: +Run all linters like: - ❯ pre-commit run --all-files + ❯ pre-commit run --hook-stage=manual --all-files isort....................................................................Passed black....................................................................Passed ruff.....................................................................Passed flake8...................................................................Passed mypy.....................................................................Passed + pytest (fast)............................................................Passed Or run a single linter like: - ❯ pre-commit run --all-files isort + ❯ pre-commit run --all-files --hook-stage=manual isort isort....................................................................Passed Importantly, you can configure pre-commit to run automatically before every commit by running: - ❯ pre-commit install --hook-type pre-commit + ❯ pre-commit install --hook-type=pre-commit pre-commit installed at .git/hooks/pre-commit - ❯ pre-commit install --hook-type pre-push + ❯ pre-commit install --hook-type=pre-push pre-commit installed at .git/hooks/pre-push This way you can ensure that you don't commit code style or formatting offenses. diff --git a/scripts/bulk-process.py b/scripts/bulk-process.py index 64c054175..8950b8936 100644 --- a/scripts/bulk-process.py +++ b/scripts/bulk-process.py @@ -75,6 +75,7 @@ import capa.main import capa.rules import capa.render.json +import capa.capabilities.common import capa.render.result_document as rd from capa.features.common import OS_AUTO @@ -112,7 +113,7 @@ def get_capa_results(args): extractor = capa.main.get_extractor( path, format, os_, capa.main.BACKEND_VIV, sigpaths, should_save_workspace, disable_progress=True ) - except capa.main.UnsupportedFormatError: + except capa.exceptions.UnsupportedFormatError: # i'm 100% sure if multiprocessing will reliably raise exceptions across process boundaries. # so instead, return an object with explicit success/failure status. # @@ -123,7 +124,7 @@ def get_capa_results(args): "status": "error", "error": f"input file does not appear to be a PE file: {path}", } - except capa.main.UnsupportedRuntimeError: + except capa.exceptions.UnsupportedRuntimeError: return { "path": path, "status": "error", @@ -136,11 +137,9 @@ def get_capa_results(args): "error": f"unexpected error: {e}", } - meta = capa.main.collect_metadata([], path, format, os_, [], extractor) - capabilities, counts = capa.main.find_capabilities(rules, extractor, disable_progress=True) + capabilities, counts = capa.capabilities.common.find_capabilities(rules, extractor, disable_progress=True) - meta.analysis.feature_counts = counts["feature_counts"] - meta.analysis.library_functions = counts["library_functions"] + meta = capa.main.collect_metadata([], path, format, os_, [], extractor, counts) meta.analysis.layout = capa.main.compute_layout(rules, extractor, capabilities) doc = rd.ResultDocument.from_capa(meta, rules, capabilities) diff --git a/scripts/capa2yara.py b/scripts/capa2yara.py index 4f0a8b90e..e287aac3e 100644 --- a/scripts/capa2yara.py +++ b/scripts/capa2yara.py @@ -566,7 +566,7 @@ def convert_rules(rules, namespaces, cround, make_priv): logger.info("skipping already converted rule capa: %s - yara rule: %s", rule.name, rule_name) continue - logger.info("-------------------------- DOING RULE CAPA: %s - yara rule: ", rule.name, rule_name) + logger.info("-------------------------- DOING RULE CAPA: %s - yara rule: %s", rule.name, rule_name) if "capa/path" in rule.meta: url = get_rule_url(rule.meta["capa/path"]) else: @@ -603,7 +603,12 @@ def convert_rules(rules, namespaces, cround, make_priv): meta_name = meta # e.g. 'examples:' can be a list seen_hashes = [] - if isinstance(metas[meta], list): + if isinstance(metas[meta], dict): + if meta_name == "scopes": + yara_meta += "\t" + "static scope" + ' = "' + metas[meta]["static"] + '"\n' + yara_meta += "\t" + "dynamic scope" + ' = "' + metas[meta]["dynamic"] + '"\n' + + elif isinstance(metas[meta], list): if meta_name == "examples": meta_name = "hash" if meta_name == "att&ck": diff --git a/scripts/capa_as_library.py b/scripts/capa_as_library.py index 06613dcbd..611576908 100644 --- a/scripts/capa_as_library.py +++ b/scripts/capa_as_library.py @@ -19,6 +19,7 @@ import capa.render.json import capa.render.utils as rutils import capa.render.default +import capa.capabilities.common import capa.render.result_document as rd import capa.features.freeze.features as frzf from capa.features.common import OS_AUTO, FORMAT_AUTO @@ -175,13 +176,10 @@ def capa_details(rules_path: Path, file_path: Path, output_format="dictionary"): extractor = capa.main.get_extractor( file_path, FORMAT_AUTO, OS_AUTO, capa.main.BACKEND_VIV, [], False, disable_progress=True ) - capabilities, counts = capa.main.find_capabilities(rules, extractor, disable_progress=True) + capabilities, counts = capa.capabilities.common.find_capabilities(rules, extractor, disable_progress=True) # collect metadata (used only to make rendering more complete) - meta = capa.main.collect_metadata([], file_path, FORMAT_AUTO, OS_AUTO, [rules_path], extractor) - - meta.analysis.feature_counts = counts["feature_counts"] - meta.analysis.library_functions = counts["library_functions"] + meta = capa.main.collect_metadata([], file_path, FORMAT_AUTO, OS_AUTO, [rules_path], extractor, counts) meta.analysis.layout = capa.main.compute_layout(rules, extractor, capabilities) capa_output: Any = False diff --git a/scripts/import-to-ida.py b/scripts/import-to-ida.py index 8414cdb82..e52a029d2 100644 --- a/scripts/import-to-ida.py +++ b/scripts/import-to-ida.py @@ -90,7 +90,7 @@ def main(): continue if rule.meta.is_subscope_rule: continue - if rule.meta.scope != capa.rules.Scope.FUNCTION: + if rule.meta.scopes.static == capa.rules.Scope.FUNCTION: continue ns = rule.meta.namespace diff --git a/scripts/lint.py b/scripts/lint.py index 2d03418c8..edcf9f563 100644 --- a/scripts/lint.py +++ b/scripts/lint.py @@ -41,6 +41,7 @@ import capa.engine import capa.helpers import capa.features.insn +import capa.capabilities.common from capa.rules import Rule, RuleSet from capa.features.common import OS_AUTO, String, Feature, Substring from capa.render.result_document import RuleMetadata @@ -151,20 +152,74 @@ def check_rule(self, ctx: Context, rule: Rule): return rule.meta["namespace"] not in get_normpath(rule.meta["capa/path"]) -class MissingScope(Lint): - name = "missing scope" - recommendation = "Add meta.scope so that the scope is explicit (defaults to `function`)" +class MissingScopes(Lint): + name = "missing scopes" + recommendation = ( + "Add meta.scopes with both the static (meta.scopes.static) and dynamic (meta.scopes.dynamic) scopes" + ) + + def check_rule(self, ctx: Context, rule: Rule): + return "scopes" not in rule.meta + + +class MissingStaticScope(Lint): + name = "missing static scope" + recommendation = ( + "Add a static scope for the rule (file, function, basic block, instruction, or unspecified/unsupported)" + ) + + def check_rule(self, ctx: Context, rule: Rule): + return "static" not in rule.meta.get("scopes") + + +class MissingDynamicScope(Lint): + name = "missing dynamic scope" + recommendation = "Add a dynamic scope for the rule (file, process, thread, call, or unspecified/unsupported)" + + def check_rule(self, ctx: Context, rule: Rule): + return "dynamic" not in rule.meta.get("scopes") + + +class InvalidStaticScope(Lint): + name = "invalid static scope" + recommendation = ( + "For the static scope, use either: file, function, basic block, instruction, or unspecified/unsupported" + ) def check_rule(self, ctx: Context, rule: Rule): - return "scope" not in rule.meta + return rule.meta.get("scopes").get("static") not in ( + "file", + "function", + "basic block", + "instruction", + "unspecified", + "unsupported", + ) -class InvalidScope(Lint): - name = "invalid scope" - recommendation = "Use only file, function, basic block, or instruction rule scopes" +class InvalidDynamicScope(Lint): + name = "invalid static scope" + recommendation = "For the dynamic scope, use either: file, process, thread, call, or unspecified/unsupported" def check_rule(self, ctx: Context, rule: Rule): - return rule.meta.get("scope") not in ("file", "function", "basic block", "instruction") + return rule.meta.get("scopes").get("dynamic") not in ( + "file", + "process", + "thread", + "call", + "unspecified", + "unsupported", + ) + + +class InvalidScopes(Lint): + name = "invalid scopes" + recommendation = "At least one scope (static or dynamic) must be specified" + + def check_rule(self, ctx: Context, rule: Rule): + return (rule.meta.get("scopes").get("static") in ("unspecified", "unsupported")) and ( + rule.meta.get("scopes").get("dynamic") in ("unspecified", "unsupported") + ) class MissingAuthors(Lint): @@ -305,14 +360,14 @@ def get_sample_capabilities(ctx: Context, path: Path) -> Set[str]: elif nice_path.name.endswith(capa.helpers.EXTENSIONS_SHELLCODE_64): format_ = "sc64" else: - format_ = capa.main.get_auto_format(nice_path) + format_ = capa.helpers.get_auto_format(nice_path) logger.debug("analyzing sample: %s", nice_path) extractor = capa.main.get_extractor( nice_path, format_, OS_AUTO, capa.main.BACKEND_VIV, DEFAULT_SIGNATURES, False, disable_progress=True ) - capabilities, _ = capa.main.find_capabilities(ctx.rules, extractor, disable_progress=True) + capabilities, _ = capa.capabilities.common.find_capabilities(ctx.rules, extractor, disable_progress=True) # mypy doesn't seem to be happy with the MatchResults type alias & set(...keys())? # so we ignore a few types here. capabilities = set(capabilities.keys()) # type: ignore @@ -700,14 +755,18 @@ def lint_name(ctx: Context, rule: Rule): return run_lints(NAME_LINTS, ctx, rule) -SCOPE_LINTS = ( - MissingScope(), - InvalidScope(), +SCOPES_LINTS = ( + MissingScopes(), + MissingStaticScope(), + MissingDynamicScope(), + InvalidStaticScope(), + InvalidDynamicScope(), + InvalidScopes(), ) def lint_scope(ctx: Context, rule: Rule): - return run_lints(SCOPE_LINTS, ctx, rule) + return run_lints(SCOPES_LINTS, ctx, rule) META_LINTS = ( diff --git a/scripts/profile-time.py b/scripts/profile-time.py index 9acd60ff4..86590a800 100644 --- a/scripts/profile-time.py +++ b/scripts/profile-time.py @@ -54,6 +54,7 @@ import capa.features import capa.features.common import capa.features.freeze +import capa.capabilities.common logger = logging.getLogger("capa.profile") @@ -114,7 +115,7 @@ def main(argv=None): def do_iteration(): capa.perf.reset() - capa.main.find_capabilities(rules, extractor, disable_progress=True) + capa.capabilities.common.find_capabilities(rules, extractor, disable_progress=True) pbar.update(1) samples = timeit.repeat(do_iteration, number=args.number, repeat=args.repeat) diff --git a/scripts/setup-linter-dependencies.py b/scripts/setup-linter-dependencies.py index bc7f9bf0d..cc8c03108 100644 --- a/scripts/setup-linter-dependencies.py +++ b/scripts/setup-linter-dependencies.py @@ -47,7 +47,7 @@ from pathlib import Path import requests -from stix2 import Filter, MemoryStore, AttackPattern # type: ignore +from stix2 import Filter, MemoryStore, AttackPattern logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s") diff --git a/scripts/show-capabilities-by-function.py b/scripts/show-capabilities-by-function.py index 787000882..421c6c7e1 100644 --- a/scripts/show-capabilities-by-function.py +++ b/scripts/show-capabilities-by-function.py @@ -74,10 +74,12 @@ import capa.render.utils as rutils import capa.render.verbose import capa.features.freeze +import capa.capabilities.common import capa.render.result_document as rd from capa.helpers import get_file_taste from capa.features.common import FORMAT_AUTO from capa.features.freeze import Address +from capa.features.extractors.base_extractor import FeatureExtractor, StaticFeatureExtractor logger = logging.getLogger("capa.show-capabilities-by-function") @@ -101,6 +103,7 @@ def render_matches_by_function(doc: rd.ResultDocument): - send HTTP request - connect to HTTP server """ + assert isinstance(doc.meta.analysis, rd.StaticAnalysis) functions_by_bb: Dict[Address, Address] = {} for finfo in doc.meta.analysis.layout.functions: faddress = finfo.address @@ -113,10 +116,10 @@ def render_matches_by_function(doc: rd.ResultDocument): matches_by_function = collections.defaultdict(set) for rule in rutils.capability_rules(doc): - if rule.meta.scope == capa.rules.FUNCTION_SCOPE: + if capa.rules.Scope.FUNCTION in rule.meta.scopes: for addr, _ in rule.matches: matches_by_function[addr].add(rule.meta.name) - elif rule.meta.scope == capa.rules.BASIC_BLOCK_SCOPE: + elif capa.rules.Scope.BASIC_BLOCK in rule.meta.scopes: for addr, _ in rule.matches: function = functions_by_bb[addr] matches_by_function[function].add(rule.meta.name) @@ -167,7 +170,7 @@ def main(argv=None): if (args.format == "freeze") or (args.format == FORMAT_AUTO and capa.features.freeze.is_freeze(taste)): format_ = "freeze" - extractor = capa.features.freeze.load(Path(args.sample).read_bytes()) + extractor: FeatureExtractor = capa.features.freeze.load(Path(args.sample).read_bytes()) else: format_ = args.format should_save_workspace = os.environ.get("CAPA_SAVE_WORKSPACE") not in ("0", "no", "NO", "n", None) @@ -176,6 +179,7 @@ def main(argv=None): extractor = capa.main.get_extractor( args.sample, args.format, args.os, args.backend, sig_paths, should_save_workspace ) + assert isinstance(extractor, StaticFeatureExtractor) except capa.exceptions.UnsupportedFormatError: capa.helpers.log_unsupported_format_error() return -1 @@ -183,14 +187,12 @@ def main(argv=None): capa.helpers.log_unsupported_runtime_error() return -1 - meta = capa.main.collect_metadata(argv, args.sample, format_, args.os, args.rules, extractor) - capabilities, counts = capa.main.find_capabilities(rules, extractor) + capabilities, counts = capa.capabilities.common.find_capabilities(rules, extractor) - meta.analysis.feature_counts = counts["feature_counts"] - meta.analysis.library_functions = counts["library_functions"] + meta = capa.main.collect_metadata(argv, args.sample, format_, args.os, args.rules, extractor, counts) meta.analysis.layout = capa.main.compute_layout(rules, extractor, capabilities) - if capa.main.has_file_limitation(rules, capabilities): + if capa.capabilities.common.has_file_limitation(rules, capabilities): # bail if capa encountered file limitation e.g. a packed binary # do show the output in verbose mode, though. if not (args.verbose or args.vverbose or args.json): diff --git a/scripts/show-features.py b/scripts/show-features.py index 295176a9d..2d5a34808 100644 --- a/scripts/show-features.py +++ b/scripts/show-features.py @@ -78,13 +78,21 @@ import capa.features import capa.exceptions import capa.render.verbose as v -import capa.features.common import capa.features.freeze import capa.features.address import capa.features.extractors.pefile -import capa.features.extractors.base_extractor -from capa.helpers import log_unsupported_runtime_error -from capa.features.extractors.base_extractor import FunctionHandle +from capa.helpers import get_auto_format, log_unsupported_runtime_error +from capa.features.insn import API, Number +from capa.features.common import ( + FORMAT_AUTO, + FORMAT_CAPE, + FORMAT_FREEZE, + DYNAMIC_FORMATS, + String, + Feature, + is_global_feature, +) +from capa.features.extractors.base_extractor import FunctionHandle, StaticFeatureExtractor, DynamicFeatureExtractor logger = logging.getLogger("capa.show-features") @@ -101,6 +109,7 @@ def main(argv=None): capa.main.install_common_args(parser, wanted={"format", "os", "sample", "signatures", "backend"}) parser.add_argument("-F", "--function", type=str, help="Show features for specific function") + parser.add_argument("-P", "--process", type=str, help="Show features for specific process name") args = parser.parse_args(args=argv) capa.main.handle_common_args(args) @@ -109,7 +118,7 @@ def main(argv=None): return -1 try: - taste = capa.helpers.get_file_taste(Path(args.sample)) + _ = capa.helpers.get_file_taste(Path(args.sample)) except IOError as e: logger.error("%s", str(e)) return -1 @@ -120,23 +129,38 @@ def main(argv=None): logger.error("%s", str(e)) return -1 - if (args.format == "freeze") or ( - args.format == capa.features.common.FORMAT_AUTO and capa.features.freeze.is_freeze(taste) - ): + format_ = args.format if args.format != FORMAT_AUTO else get_auto_format(args.sample) + if format_ == FORMAT_FREEZE: + # this should be moved above the previous if clause after implementing + # feature freeze for the dynamic analysis flavor extractor = capa.features.freeze.load(Path(args.sample).read_bytes()) else: should_save_workspace = os.environ.get("CAPA_SAVE_WORKSPACE") not in ("0", "no", "NO", "n", None) try: extractor = capa.main.get_extractor( - args.sample, args.format, args.os, args.backend, sig_paths, should_save_workspace + args.sample, format_, args.os, args.backend, sig_paths, should_save_workspace ) - except capa.exceptions.UnsupportedFormatError: - capa.helpers.log_unsupported_format_error() + except capa.exceptions.UnsupportedFormatError as e: + if format_ == FORMAT_CAPE: + capa.helpers.log_unsupported_cape_report_error(str(e)) + else: + capa.helpers.log_unsupported_format_error() return -1 except capa.exceptions.UnsupportedRuntimeError: log_unsupported_runtime_error() return -1 + if format_ in DYNAMIC_FORMATS: + assert isinstance(extractor, DynamicFeatureExtractor) + print_dynamic_analysis(extractor, args) + else: + assert isinstance(extractor, StaticFeatureExtractor) + print_static_analysis(extractor, args) + + return 0 + + +def print_static_analysis(extractor: StaticFeatureExtractor, args): for feature, addr in extractor.extract_global_features(): print(f"global: {format_address(addr)}: {feature}") @@ -165,56 +189,29 @@ def main(argv=None): print(f"{args.function} not a function") return -1 - print_features(function_handles, extractor) + print_static_features(function_handles, extractor) - return 0 - - -def ida_main(): - import idc - - import capa.features.extractors.ida.extractor - function = idc.get_func_attr(idc.here(), idc.FUNCATTR_START) - print(f"getting features for current function {hex(function)}") - - extractor = capa.features.extractors.ida.extractor.IdaFeatureExtractor() +def print_dynamic_analysis(extractor: DynamicFeatureExtractor, args): + for feature, addr in extractor.extract_global_features(): + print(f"global: {format_address(addr)}: {feature}") - if not function: + if not args.process: for feature, addr in extractor.extract_file_features(): print(f"file: {format_address(addr)}: {feature}") - return - - function_handles = tuple(extractor.get_functions()) - if function: - function_handles = tuple(filter(lambda fh: fh.inner.start_ea == function, function_handles)) + process_handles = tuple(extractor.get_processes()) - if len(function_handles) == 0: - print(f"{hex(function)} not a function") + if args.process: + process_handles = tuple(filter(lambda ph: ph.inner["name"] == args.process, process_handles)) + if args.process not in [ph.inner["name"] for ph in args.process]: + print(f"{args.process} not a process") return -1 - print_features(function_handles, extractor) - - return 0 - - -def ghidra_main(): - import capa.features.extractors.ghidra.extractor - - extractor = capa.features.extractors.ghidra.extractor.GhidraFeatureExtractor() - - for feature, addr in extractor.extract_file_features(): - print(f"file: {format_address(addr)}: {feature}") - - function_handles = tuple(extractor.get_functions()) - - print_features(function_handles, extractor) - - return 0 + print_dynamic_features(process_handles, extractor) -def print_features(functions, extractor: capa.features.extractors.base_extractor.FeatureExtractor): +def print_static_features(functions, extractor: StaticFeatureExtractor): for f in functions: if extractor.is_library_function(f.address): function_name = extractor.get_function_name(f.address) @@ -224,7 +221,7 @@ def print_features(functions, extractor: capa.features.extractors.base_extractor print(f"func: {format_address(f.address)}") for feature, addr in extractor.extract_function_features(f): - if capa.features.common.is_global_feature(feature): + if is_global_feature(feature): continue if f.address != addr: @@ -234,7 +231,7 @@ def print_features(functions, extractor: capa.features.extractors.base_extractor for bb in extractor.get_basic_blocks(f): for feature, addr in extractor.extract_basic_block_features(f, bb): - if capa.features.common.is_global_feature(feature): + if is_global_feature(feature): continue if bb.address != addr: @@ -244,7 +241,7 @@ def print_features(functions, extractor: capa.features.extractors.base_extractor for insn in extractor.get_instructions(f, bb): for feature, addr in extractor.extract_insn_features(f, bb, insn): - if capa.features.common.is_global_feature(feature): + if is_global_feature(feature): continue try: @@ -260,6 +257,90 @@ def print_features(functions, extractor: capa.features.extractors.base_extractor continue +def print_dynamic_features(processes, extractor: DynamicFeatureExtractor): + for p in processes: + print(f"proc: {p.inner.process_name} (ppid={p.address.ppid}, pid={p.address.pid})") + + for feature, addr in extractor.extract_process_features(p): + if is_global_feature(feature): + continue + + print(f" proc: {p.inner.process_name}: {feature}") + + for t in extractor.get_threads(p): + print(f" thread: {t.address.tid}") + for feature, addr in extractor.extract_thread_features(p, t): + if is_global_feature(feature): + continue + + if feature != Feature(0): + print(f" {format_address(addr)}: {feature}") + + for call in extractor.get_calls(p, t): + apis = [] + arguments = [] + for feature, addr in extractor.extract_call_features(p, t, call): + if is_global_feature(feature): + continue + + if isinstance(feature, API): + assert isinstance(addr, capa.features.address.DynamicCallAddress) + apis.append((addr.id, str(feature.value))) + + if isinstance(feature, (Number, String)): + arguments.append(str(feature.value)) + + if not apis: + print(f" arguments=[{', '.join(arguments)}]") + + for cid, api in apis: + print(f" call {cid}: {api}({', '.join(arguments)})") + + +def ida_main(): + import idc + + import capa.features.extractors.ida.extractor + + function = idc.get_func_attr(idc.here(), idc.FUNCATTR_START) + print(f"getting features for current function {hex(function)}") + + extractor = capa.features.extractors.ida.extractor.IdaFeatureExtractor() + + if not function: + for feature, addr in extractor.extract_file_features(): + print(f"file: {format_address(addr)}: {feature}") + return + + function_handles = tuple(extractor.get_functions()) + + if function: + function_handles = tuple(filter(lambda fh: fh.inner.start_ea == function, function_handles)) + + if len(function_handles) == 0: + print(f"{hex(function)} not a function") + return -1 + + print_static_features(function_handles, extractor) + + return 0 + + +def ghidra_main(): + import capa.features.extractors.ghidra.extractor + + extractor = capa.features.extractors.ghidra.extractor.GhidraFeatureExtractor() + + for feature, addr in extractor.extract_file_features(): + print(f"file: {format_address(addr)}: {feature}") + + function_handles = tuple(extractor.get_functions()) + + print_static_features(function_handles, extractor) + + return 0 + + if __name__ == "__main__": if capa.helpers.is_runtime_ida(): ida_main() diff --git a/scripts/show-unused-features.py b/scripts/show-unused-features.py index dbd6c8c89..ddd236614 100644 --- a/scripts/show-unused-features.py +++ b/scripts/show-unused-features.py @@ -33,7 +33,7 @@ import capa.features.extractors.base_extractor from capa.helpers import log_unsupported_runtime_error from capa.features.common import Feature -from capa.features.extractors.base_extractor import FunctionHandle +from capa.features.extractors.base_extractor import FunctionHandle, StaticFeatureExtractor logger = logging.getLogger("show-unused-features") @@ -52,7 +52,7 @@ def get_rules_feature_set(rules_path) -> Set[Feature]: def get_file_features( - functions: Tuple[FunctionHandle, ...], extractor: capa.features.extractors.base_extractor.FeatureExtractor + functions: Tuple[FunctionHandle, ...], extractor: capa.features.extractors.base_extractor.StaticFeatureExtractor ) -> typing.Counter[Feature]: feature_map: typing.Counter[Feature] = Counter() @@ -145,6 +145,8 @@ def main(argv=None): log_unsupported_runtime_error() return -1 + assert isinstance(extractor, StaticFeatureExtractor), "only static analysis supported today" + feature_map: typing.Counter[Feature] = Counter() feature_map.update([feature for feature, _ in extractor.extract_global_features()]) diff --git a/tests/fixtures.py b/tests/fixtures.py index 05b60c877..2f8eac15a 100644 --- a/tests/fixtures.py +++ b/tests/fixtures.py @@ -38,7 +38,14 @@ FeatureAccess, ) from capa.features.address import Address -from capa.features.extractors.base_extractor import BBHandle, InsnHandle, FunctionHandle +from capa.features.extractors.base_extractor import ( + BBHandle, + CallHandle, + InsnHandle, + ThreadHandle, + ProcessHandle, + FunctionHandle, +) from capa.features.extractors.dnfile.extractor import DnfileFeatureExtractor CD = Path(__file__).resolve().parent @@ -181,6 +188,20 @@ def get_binja_extractor(path: Path): return extractor +@lru_cache(maxsize=1) +def get_cape_extractor(path): + import gzip + import json + + from capa.features.extractors.cape.extractor import CapeExtractor + + with gzip.open(path, "r") as compressed_report: + report_json = compressed_report.read() + report = json.loads(report_json) + + return CapeExtractor.from_report(report) + + @lru_cache(maxsize=1) def get_ghidra_extractor(path: Path): import capa.features.extractors.ghidra.extractor @@ -206,6 +227,36 @@ def extract_file_features(extractor): return features +def extract_process_features(extractor, ph): + features = collections.defaultdict(set) + for th in extractor.get_threads(ph): + for ch in extractor.get_calls(ph, th): + for feature, va in extractor.extract_call_features(ph, th, ch): + features[feature].add(va) + for feature, va in extractor.extract_thread_features(ph, th): + features[feature].add(va) + for feature, va in extractor.extract_process_features(ph): + features[feature].add(va) + return features + + +def extract_thread_features(extractor, ph, th): + features = collections.defaultdict(set) + for ch in extractor.get_calls(ph, th): + for feature, va in extractor.extract_call_features(ph, th, ch): + features[feature].add(va) + for feature, va in extractor.extract_thread_features(ph, th): + features[feature].add(va) + return features + + +def extract_call_features(extractor, ph, th, ch): + features = collections.defaultdict(set) + for feature, addr in extractor.extract_call_features(ph, th, ch): + features[feature].add(addr) + return features + + # f may not be hashable (e.g. ida func_t) so cannot @lru_cache this def extract_function_features(extractor, fh): features = collections.defaultdict(set) @@ -319,6 +370,24 @@ def get_data_path_by_name(name) -> Path: return CD / "data" / "294b8db1f2702b60fb2e42fdc50c2cee6a5046112da9a5703a548a4fa50477bc.elf_" elif name.startswith("2bf18d"): return CD / "data" / "2bf18d0403677378adad9001b1243211.elf_" + elif name.startswith("0000a657"): + return ( + CD + / "data" + / "dynamic" + / "cape" + / "v2.2" + / "0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json.gz" + ) + elif name.startswith("d46900"): + return ( + CD + / "data" + / "dynamic" + / "cape" + / "v2.2" + / "d46900384c78863420fb3e297d0a2f743cd2b6b3f7f82bf64059a168e07aceb7.json.gz" + ) elif name.startswith("ea2876"): return CD / "data" / "ea2876e9175410b6f6719f80ee44b9553960758c7d0f7bed73c0fe9a78d8e669.dll_" elif name.startswith("1038a2"): @@ -398,6 +467,27 @@ def sample(request): return resolve_sample(request.param) +def get_process(extractor, ppid: int, pid: int) -> ProcessHandle: + for ph in extractor.get_processes(): + if ph.address.ppid == ppid and ph.address.pid == pid: + return ph + raise ValueError("process not found") + + +def get_thread(extractor, ph: ProcessHandle, tid: int) -> ThreadHandle: + for th in extractor.get_threads(ph): + if th.address.tid == tid: + return th + raise ValueError("thread not found") + + +def get_call(extractor, ph: ProcessHandle, th: ThreadHandle, cid: int) -> CallHandle: + for ch in extractor.get_calls(ph, th): + if ch.address.id == cid: + return ch + raise ValueError("call not found") + + def get_function(extractor, fva: int) -> FunctionHandle: for fh in extractor.get_functions(): if isinstance(extractor, DnfileFeatureExtractor): @@ -505,6 +595,63 @@ def inner_function(extractor): inner_function.__name__ = scope return inner_function + elif "call=" in scope: + # like `process=(pid:ppid),thread=tid,call=id` + assert "process=" in scope + assert "thread=" in scope + pspec, _, spec = scope.partition(",") + tspec, _, cspec = spec.partition(",") + pspec = pspec.partition("=")[2][1:-1].split(":") + assert len(pspec) == 2 + pid, ppid = map(int, pspec) + tid = int(tspec.partition("=")[2]) + cid = int(cspec.partition("=")[2]) + + def inner_call(extractor): + ph = get_process(extractor, ppid, pid) + th = get_thread(extractor, ph, tid) + ch = get_call(extractor, ph, th, cid) + features = extract_call_features(extractor, ph, th, ch) + for k, vs in extract_global_features(extractor).items(): + features[k].update(vs) + return features + + inner_call.__name__ = scope + return inner_call + elif "thread=" in scope: + # like `process=(pid:ppid),thread=tid` + assert "process=" in scope + pspec, _, tspec = scope.partition(",") + pspec = pspec.partition("=")[2][1:-1].split(":") + assert len(pspec) == 2 + pid, ppid = map(int, pspec) + tid = int(tspec.partition("=")[2]) + + def inner_thread(extractor): + ph = get_process(extractor, ppid, pid) + th = get_thread(extractor, ph, tid) + features = extract_thread_features(extractor, ph, th) + for k, vs in extract_global_features(extractor).items(): + features[k].update(vs) + return features + + inner_thread.__name__ = scope + return inner_thread + elif "process=" in scope: + # like `process=(pid:ppid)` + pspec = scope.partition("=")[2][1:-1].split(":") + assert len(pspec) == 2 + pid, ppid = map(int, pspec) + + def inner_process(extractor): + ph = get_process(extractor, ppid, pid) + features = extract_process_features(extractor, ph) + for k, vs in extract_global_features(extractor).items(): + features[k].update(vs) + return features + + inner_process.__name__ = scope + return inner_process else: raise ValueError("unexpected scope fixture") @@ -530,6 +677,84 @@ def parametrize(params, values, **kwargs): return pytest.mark.parametrize(params, values, ids=ids, **kwargs) +DYNAMIC_FEATURE_PRESENCE_TESTS = sorted( + [ + # file/string + ("0000a657", "file", capa.features.common.String("T_Ba?.BcRJa"), True), + ("0000a657", "file", capa.features.common.String("GetNamedPipeClientSessionId"), True), + ("0000a657", "file", capa.features.common.String("nope"), False), + # file/sections + ("0000a657", "file", capa.features.file.Section(".rdata"), True), + ("0000a657", "file", capa.features.file.Section(".nope"), False), + # file/imports + ("0000a657", "file", capa.features.file.Import("NdrSimpleTypeUnmarshall"), True), + ("0000a657", "file", capa.features.file.Import("Nope"), False), + # file/exports + ("0000a657", "file", capa.features.file.Export("Nope"), False), + # process/environment variables + ( + "0000a657", + "process=(1180:3052)", + capa.features.common.String("C:\\Users\\comp\\AppData\\Roaming\\Microsoft\\Jxoqwnx\\jxoqwn.exe"), + True, + ), + ("0000a657", "process=(1180:3052)", capa.features.common.String("nope"), False), + # thread/api calls + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.API("NtQueryValueKey"), True), + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.API("GetActiveWindow"), False), + # thread/number call argument + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.Number(0x000000EC), True), + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.Number(110173), False), + # thread/string call argument + ("0000a657", "process=(2852:3052),thread=2804", capa.features.common.String("SetThreadUILanguage"), True), + ("0000a657", "process=(2852:3052),thread=2804", capa.features.common.String("nope"), False), + ("0000a657", "process=(2852:3052),thread=2804,call=56", capa.features.insn.API("NtQueryValueKey"), True), + ("0000a657", "process=(2852:3052),thread=2804,call=1958", capa.features.insn.API("nope"), False), + ], + # order tests by (file, item) + # so that our LRU cache is most effective. + key=lambda t: (t[0], t[1]), +) + +DYNAMIC_FEATURE_COUNT_TESTS = sorted( + [ + # file/string + ("0000a657", "file", capa.features.common.String("T_Ba?.BcRJa"), 1), + ("0000a657", "file", capa.features.common.String("GetNamedPipeClientSessionId"), 1), + ("0000a657", "file", capa.features.common.String("nope"), 0), + # file/sections + ("0000a657", "file", capa.features.file.Section(".rdata"), 1), + ("0000a657", "file", capa.features.file.Section(".nope"), 0), + # file/imports + ("0000a657", "file", capa.features.file.Import("NdrSimpleTypeUnmarshall"), 1), + ("0000a657", "file", capa.features.file.Import("Nope"), 0), + # file/exports + ("0000a657", "file", capa.features.file.Export("Nope"), 0), + # process/environment variables + ( + "0000a657", + "process=(1180:3052)", + capa.features.common.String("C:\\Users\\comp\\AppData\\Roaming\\Microsoft\\Jxoqwnx\\jxoqwn.exe"), + 2, + ), + ("0000a657", "process=(1180:3052)", capa.features.common.String("nope"), 0), + # thread/api calls + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.API("NtQueryValueKey"), 7), + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.API("GetActiveWindow"), 0), + # thread/number call argument + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.Number(0x000000EC), 1), + ("0000a657", "process=(2852:3052),thread=2804", capa.features.insn.Number(110173), 0), + # thread/string call argument + ("0000a657", "process=(2852:3052),thread=2804", capa.features.common.String("SetThreadUILanguage"), 1), + ("0000a657", "process=(2852:3052),thread=2804", capa.features.common.String("nope"), 0), + ("0000a657", "process=(2852:3052),thread=2804,call=56", capa.features.insn.API("NtQueryValueKey"), 1), + ("0000a657", "process=(2852:3052),thread=2804,call=1958", capa.features.insn.API("nope"), 0), + ], + # order tests by (file, item) + # so that our LRU cache is most effective. + key=lambda t: (t[0], t[1]), +) + FEATURE_PRESENCE_TESTS = sorted( [ # file/characteristic("embedded pe") @@ -554,6 +779,7 @@ def parametrize(params, values, **kwargs): ("mimikatz", "file", capa.features.file.Import("advapi32.CryptSetHashParam"), True), ("mimikatz", "file", capa.features.file.Import("CryptSetHashParam"), True), ("mimikatz", "file", capa.features.file.Import("kernel32.IsWow64Process"), True), + ("mimikatz", "file", capa.features.file.Import("IsWow64Process"), True), ("mimikatz", "file", capa.features.file.Import("msvcrt.exit"), True), ("mimikatz", "file", capa.features.file.Import("cabinet.#11"), True), ("mimikatz", "file", capa.features.file.Import("#11"), False), @@ -634,11 +860,12 @@ def parametrize(params, values, **kwargs): # .text:004018C0 8D 4B 02 lea ecx, [ebx+2] ("mimikatz", "function=0x401873,bb=0x4018B2,insn=0x4018C0", capa.features.insn.Number(0x2), True), # insn/api - ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptAcquireContextW"), True), - ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptAcquireContext"), True), - ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptGenKey"), True), - ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptImportKey"), True), - ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptDestroyKey"), True), + # not extracting dll anymore + ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptAcquireContextW"), False), + ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptAcquireContext"), False), + ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptGenKey"), False), + ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptImportKey"), False), + ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.CryptDestroyKey"), False), ("mimikatz", "function=0x403BAC", capa.features.insn.API("CryptAcquireContextW"), True), ("mimikatz", "function=0x403BAC", capa.features.insn.API("CryptAcquireContext"), True), ("mimikatz", "function=0x403BAC", capa.features.insn.API("CryptGenKey"), True), @@ -647,7 +874,8 @@ def parametrize(params, values, **kwargs): ("mimikatz", "function=0x403BAC", capa.features.insn.API("Nope"), False), ("mimikatz", "function=0x403BAC", capa.features.insn.API("advapi32.Nope"), False), # insn/api: thunk - ("mimikatz", "function=0x4556E5", capa.features.insn.API("advapi32.LsaQueryInformationPolicy"), True), + # not extracting dll anymore + ("mimikatz", "function=0x4556E5", capa.features.insn.API("advapi32.LsaQueryInformationPolicy"), False), ("mimikatz", "function=0x4556E5", capa.features.insn.API("LsaQueryInformationPolicy"), True), # insn/api: x64 ( @@ -671,10 +899,15 @@ def parametrize(params, values, **kwargs): ("mimikatz", "function=0x40B3C6", capa.features.insn.API("LocalFree"), True), ("c91887...", "function=0x40156F", capa.features.insn.API("CloseClipboard"), True), # insn/api: resolve indirect calls - ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.CreatePipe"), True), - ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.SetHandleInformation"), True), - ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.CloseHandle"), True), - ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.WriteFile"), True), + # not extracting dll anymore + ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.CreatePipe"), False), + ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.SetHandleInformation"), False), + ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.CloseHandle"), False), + ("c91887...", "function=0x401A77", capa.features.insn.API("kernel32.WriteFile"), False), + ("c91887...", "function=0x401A77", capa.features.insn.API("CreatePipe"), True), + ("c91887...", "function=0x401A77", capa.features.insn.API("SetHandleInformation"), True), + ("c91887...", "function=0x401A77", capa.features.insn.API("CloseHandle"), True), + ("c91887...", "function=0x401A77", capa.features.insn.API("WriteFile"), True), # insn/string ("mimikatz", "function=0x40105D", capa.features.common.String("SCardControl"), True), ("mimikatz", "function=0x40105D", capa.features.common.String("SCardTransmit"), True), @@ -849,7 +1082,8 @@ def parametrize(params, values, **kwargs): ("_1c444", "file", capa.features.file.Import("CreateCompatibleBitmap"), True), ("_1c444", "file", capa.features.file.Import("gdi32::CreateCompatibleBitmap"), False), ("_1c444", "function=0x1F68", capa.features.insn.API("GetWindowDC"), True), - ("_1c444", "function=0x1F68", capa.features.insn.API("user32.GetWindowDC"), True), + # not extracting dll anymore + ("_1c444", "function=0x1F68", capa.features.insn.API("user32.GetWindowDC"), False), ("_1c444", "function=0x1F68", capa.features.insn.Number(0xCC0020), True), ("_1c444", "token=0x600001D", capa.features.common.Characteristic("calls to"), True), ("_1c444", "token=0x6000018", capa.features.common.Characteristic("calls to"), False), @@ -1214,29 +1448,42 @@ def get_result_doc(path: Path): @pytest.fixture def pma0101_rd(): + # python -m capa.main tests/data/Practical\ Malware\ Analysis\ Lab\ 01-01.dll_ --json > tests/data/rd/Practical\ Malware\ Analysis\ Lab\ 01-01.dll_.json return get_result_doc(CD / "data" / "rd" / "Practical Malware Analysis Lab 01-01.dll_.json") @pytest.fixture def dotnet_1c444e_rd(): + # .NET sample + # python -m capa.main tests/data/dotnet/1c444ebeba24dcba8628b7dfe5fec7c6.exe_ --json > tests/data/rd/1c444ebeba24dcba8628b7dfe5fec7c6.exe_.json return get_result_doc(CD / "data" / "rd" / "1c444ebeba24dcba8628b7dfe5fec7c6.exe_.json") @pytest.fixture def a3f3bbc_rd(): + # python -m capa.main tests/data/3f3bbcf8fd90bdcdcdc5494314ed4225.exe_ --json > tests/data/rd/3f3bbcf8fd90bdcdcdc5494314ed4225.exe_.json return get_result_doc(CD / "data" / "rd" / "3f3bbcf8fd90bdcdcdc5494314ed4225.exe_.json") @pytest.fixture def al_khaserx86_rd(): + # python -m capa.main tests/data/al-khaser_x86.exe_ --json > tests/data/rd/al-khaser_x86.exe_.json return get_result_doc(CD / "data" / "rd" / "al-khaser_x86.exe_.json") @pytest.fixture def al_khaserx64_rd(): + # python -m capa.main tests/data/al-khaser_x64.exe_ --json > tests/data/rd/al-khaser_x64.exe_.json return get_result_doc(CD / "data" / "rd" / "al-khaser_x64.exe_.json") @pytest.fixture def a076114_rd(): + # python -m capa.main tests/data/0761142efbda6c4b1e801223de723578.dll_ --json > tests/data/rd/0761142efbda6c4b1e801223de723578.dll_.json return get_result_doc(CD / "data" / "rd" / "0761142efbda6c4b1e801223de723578.dll_.json") + + +@pytest.fixture +def dynamic_a0000a6_rd(): + # python -m capa.main tests/data/dynamic/cape/v2.2/0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json --json > tests/data/rd/0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json + return get_result_doc(CD / "data" / "rd" / "0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json") diff --git a/tests/test_capabilities.py b/tests/test_capabilities.py new file mode 100644 index 000000000..ddc7f6c3f --- /dev/null +++ b/tests/test_capabilities.py @@ -0,0 +1,309 @@ +# -*- coding: utf-8 -*- +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import textwrap + +import capa.capabilities.common + + +def test_match_across_scopes_file_function(z9324d_extractor): + rules = capa.rules.RuleSet( + [ + # this rule should match on a function (0x4073F0) + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: install service + scopes: + static: function + dynamic: process + examples: + - 9324d1a8ae37a36ae560c37448c9705a:0x4073F0 + features: + - and: + - api: advapi32.OpenSCManagerA + - api: advapi32.CreateServiceA + - api: advapi32.StartServiceA + """ + ) + ), + # this rule should match on a file feature + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: .text section + scopes: + static: file + dynamic: process + examples: + - 9324d1a8ae37a36ae560c37448c9705a + features: + - section: .text + """ + ) + ), + # this rule should match on earlier rule matches: + # - install service, with function scope + # - .text section, with file scope + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: .text section and install service + scopes: + static: file + dynamic: process + examples: + - 9324d1a8ae37a36ae560c37448c9705a + features: + - and: + - match: install service + - match: .text section + """ + ) + ), + ] + ) + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "install service" in capabilities + assert ".text section" in capabilities + assert ".text section and install service" in capabilities + + +def test_match_across_scopes(z9324d_extractor): + rules = capa.rules.RuleSet( + [ + # this rule should match on a basic block (including at least 0x403685) + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: tight loop + scopes: + static: basic block + dynamic: process + examples: + - 9324d1a8ae37a36ae560c37448c9705a:0x403685 + features: + - characteristic: tight loop + """ + ) + ), + # this rule should match on a function (0x403660) + # based on API, as well as prior basic block rule match + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: kill thread loop + scopes: + static: function + dynamic: process + examples: + - 9324d1a8ae37a36ae560c37448c9705a:0x403660 + features: + - and: + - api: kernel32.TerminateThread + - api: kernel32.CloseHandle + - match: tight loop + """ + ) + ), + # this rule should match on a file feature and a prior function rule match + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: kill thread program + scopes: + static: file + dynamic: process + examples: + - 9324d1a8ae37a36ae560c37448c9705a + features: + - and: + - section: .text + - match: kill thread loop + """ + ) + ), + ] + ) + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "tight loop" in capabilities + assert "kill thread loop" in capabilities + assert "kill thread program" in capabilities + + +def test_subscope_bb_rules(z9324d_extractor): + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: function + dynamic: process + features: + - and: + - basic block: + - characteristic: tight loop + """ + ) + ) + ] + ) + # tight loop at 0x403685 + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "test rule" in capabilities + + +def test_byte_matching(z9324d_extractor): + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: byte match test + scopes: + static: function + dynamic: process + features: + - and: + - bytes: ED 24 9E F4 52 A9 07 47 55 8E E1 AB 30 8E 23 61 + """ + ) + ) + ] + ) + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "byte match test" in capabilities + + +def test_com_feature_matching(z395eb_extractor): + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: initialize IWebBrowser2 + scopes: + static: basic block + dynamic: unsupported + features: + - and: + - api: ole32.CoCreateInstance + - com/class: InternetExplorer #bytes: 01 DF 02 00 00 00 00 00 C0 00 00 00 00 00 00 46 = CLSID_InternetExplorer + - com/interface: IWebBrowser2 #bytes: 61 16 0C D3 AF CD D0 11 8A 3E 00 C0 4F C9 E2 6E = IID_IWebBrowser2 + """ + ) + ) + ] + ) + capabilities, meta = capa.main.find_capabilities(rules, z395eb_extractor) + assert "initialize IWebBrowser2" in capabilities + + +def test_count_bb(z9324d_extractor): + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: count bb + namespace: test + scopes: + static: function + dynamic: process + features: + - and: + - count(basic blocks): 1 or more + """ + ) + ) + ] + ) + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "count bb" in capabilities + + +def test_instruction_scope(z9324d_extractor): + # .text:004071A4 68 E8 03 00 00 push 3E8h + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: push 1000 + namespace: test + scopes: + static: instruction + dynamic: process + features: + - and: + - mnemonic: push + - number: 1000 + """ + ) + ) + ] + ) + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "push 1000" in capabilities + assert 0x4071A4 in {result[0] for result in capabilities["push 1000"]} + + +def test_instruction_subscope(z9324d_extractor): + # .text:00406F60 sub_406F60 proc near + # [...] + # .text:004071A4 68 E8 03 00 00 push 3E8h + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: push 1000 on i386 + namespace: test + scopes: + static: function + dynamic: process + features: + - and: + - arch: i386 + - instruction: + - mnemonic: push + - number: 1000 + """ + ) + ) + ] + ) + capabilities, meta = capa.capabilities.common.find_capabilities(rules, z9324d_extractor) + assert "push 1000 on i386" in capabilities + assert 0x406F60 in {result[0] for result in capabilities["push 1000 on i386"]} diff --git a/tests/test_cape_features.py b/tests/test_cape_features.py new file mode 100644 index 000000000..6dc833c0a --- /dev/null +++ b/tests/test_cape_features.py @@ -0,0 +1,27 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import fixtures + + +@fixtures.parametrize( + "sample,scope,feature,expected", + fixtures.DYNAMIC_FEATURE_PRESENCE_TESTS, + indirect=["sample", "scope"], +) +def test_cape_features(sample, scope, feature, expected): + fixtures.do_test_feature_presence(fixtures.get_cape_extractor, sample, scope, feature, expected) + + +@fixtures.parametrize( + "sample,scope,feature,expected", + fixtures.DYNAMIC_FEATURE_COUNT_TESTS, + indirect=["sample", "scope"], +) +def test_cape_feature_counts(sample, scope, feature, expected): + fixtures.do_test_feature_count(fixtures.get_cape_extractor, sample, scope, feature, expected) diff --git a/tests/test_cape_model.py b/tests/test_cape_model.py new file mode 100644 index 000000000..5e0ee84da --- /dev/null +++ b/tests/test_cape_model.py @@ -0,0 +1,72 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import gzip +from pathlib import Path + +import fixtures + +from capa.features.extractors.cape.models import Call, CapeReport + +CD = Path(__file__).resolve().parent +CAPE_DIR = CD / "data" / "dynamic" / "cape" + + +@fixtures.parametrize( + "version,filename", + [ + ("v2.2", "0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82.json.gz"), + ("v2.2", "55dcd38773f4104b95589acc87d93bf8b4a264b4a6d823b73fb6a7ab8144c08b.json.gz"), + ("v2.2", "77c961050aa252d6d595ec5120981abf02068c968f4a5be5958d10e87aa6f0e8.json.gz"), + ("v2.2", "d46900384c78863420fb3e297d0a2f743cd2b6b3f7f82bf64059a168e07aceb7.json.gz"), + ("v2.4", "36d218f384010cce9f58b8193b7d8cc855d1dff23f80d16e13a883e152d07921.json.gz"), + ("v2.4", "41ce492f04accef7931b84b8548a6ca717ffabb9bedc4f624de2d37a5345036c.json.gz"), + ("v2.4", "515a6269965ccdf1005008e017ec87fafb97fd2464af1c393ad93b438f6f33fe.json.gz"), + ("v2.4", "5d61700feabba201e1ba98df3c8210a3090c8c9f9adbf16cb3d1da3aaa2a9d96.json.gz"), + ("v2.4", "5effaf6795932d8b36755f89f99ce7436421ea2bd1ed5bc55476530c1a22009f.json.gz"), + ("v2.4", "873275144af88e9b95ea2c59ece39b8ce5a9d7fe09774b683050098ac965054d.json.gz"), + ("v2.4", "8b9aaf4fad227cde7a7dabce7ba187b0b923301718d9d40de04bdd15c9b22905.json.gz"), + ("v2.4", "b1c4aa078880c579961dc5ec899b2c2e08ae5db80b4263e4ca9607a68e2faef9.json.gz"), + ("v2.4", "fb7ade52dc5a1d6128b9c217114a46d0089147610f99f5122face29e429a1e74.json.gz"), + ], +) +def test_cape_model_can_load(version: str, filename: str): + path = CAPE_DIR / version / filename + buf = gzip.decompress(path.read_bytes()) + report = CapeReport.from_buf(buf) + assert report is not None + + +def test_cape_model_argument(): + call = Call.model_validate_json( + """ + { + "timestamp": "2023-10-20 12:30:14,015", + "thread_id": "2380", + "caller": "0x7797dff8", + "parentcaller": "0x77973486", + "category": "system", + "api": "TestApiCall", + "status": true, + "return": "0x00000000", + "arguments": [ + { + "name": "Value Base 10", + "value": "30" + }, + { + "name": "Value Base 16", + "value": "0x30" + } + ], + "repeated": 19, + "id": 0 + } + """ + ) + assert call.arguments[0].value == 30 + assert call.arguments[1].value == 0x30 diff --git a/tests/test_extractor_hashing.py b/tests/test_extractor_hashing.py new file mode 100644 index 000000000..4fa10a202 --- /dev/null +++ b/tests/test_extractor_hashing.py @@ -0,0 +1,86 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. + +import logging + +import pytest +import fixtures + +from capa.features.extractors.base_extractor import SampleHashes + +logger = logging.getLogger(__name__) + + +def test_viv_hash_extraction(): + assert fixtures.get_viv_extractor(fixtures.get_data_path_by_name("mimikatz")).get_sample_hashes() == SampleHashes( + md5="5f66b82558ca92e54e77f216ef4c066c", + sha1="e4f82e4d7f22938dc0a0ff8a4a7ad2a763643d38", + sha256="131314a6f6d1d263c75b9909586b3e1bd837036329ace5e69241749e861ac01d", + ) + + +def test_pefile_hash_extraction(): + assert fixtures.get_pefile_extractor( + fixtures.get_data_path_by_name("mimikatz") + ).get_sample_hashes() == SampleHashes( + md5="5f66b82558ca92e54e77f216ef4c066c", + sha1="e4f82e4d7f22938dc0a0ff8a4a7ad2a763643d38", + sha256="131314a6f6d1d263c75b9909586b3e1bd837036329ace5e69241749e861ac01d", + ) + + +def test_dnfile_hash_extraction(): + assert fixtures.get_dnfile_extractor(fixtures.get_data_path_by_name("b9f5b")).get_sample_hashes() == SampleHashes( + md5="b9f5bd514485fb06da39beff051b9fdc", + sha1="c72a2e50410475a51d897d29ffbbaf2103754d53", + sha256="34acc4c0b61b5ce0b37c3589f97d1f23e6d84011a241e6f85683ee517ce786f1", + ) + + +def test_dotnetfile_hash_extraction(): + assert fixtures.get_dotnetfile_extractor( + fixtures.get_data_path_by_name("b9f5b") + ).get_sample_hashes() == SampleHashes( + md5="b9f5bd514485fb06da39beff051b9fdc", + sha1="c72a2e50410475a51d897d29ffbbaf2103754d53", + sha256="34acc4c0b61b5ce0b37c3589f97d1f23e6d84011a241e6f85683ee517ce786f1", + ) + + +def test_cape_hash_extraction(): + assert fixtures.get_cape_extractor(fixtures.get_data_path_by_name("0000a657")).get_sample_hashes() == SampleHashes( + md5="e2147b5333879f98d515cd9aa905d489", + sha1="ad4d520fb7792b4a5701df973d6bd8a6cbfbb57f", + sha256="0000a65749f5902c4d82ffa701198038f0b4870b00a27cfca109f8f933476d82", + ) + + +# We need to skip the binja test if we cannot import binaryninja, e.g., in GitHub CI. +binja_present: bool = False +try: + import binaryninja + + try: + binaryninja.load(source=b"\x90") + except RuntimeError: + logger.warning("Binary Ninja license is not valid, provide via $BN_LICENSE or license.dat") + else: + binja_present = True +except ImportError: + pass + + +@pytest.mark.skipif(binja_present is False, reason="Skip binja tests if the binaryninja Python API is not installed") +def test_binja_hash_extraction(): + extractor = fixtures.get_binja_extractor(fixtures.get_data_path_by_name("mimikatz")) + hashes = SampleHashes( + md5="5f66b82558ca92e54e77f216ef4c066c", + sha1="e4f82e4d7f22938dc0a0ff8a4a7ad2a763643d38", + sha256="131314a6f6d1d263c75b9909586b3e1bd837036329ace5e69241749e861ac01d", + ) + assert extractor.get_sample_hashes() == hashes diff --git a/tests/test_fmt.py b/tests/test_fmt.py index 6bb0f0872..8688db988 100644 --- a/tests/test_fmt.py +++ b/tests/test_fmt.py @@ -17,7 +17,9 @@ name: test rule authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process examples: - foo1234 - bar5678 @@ -41,7 +43,9 @@ def test_rule_reformat_top_level_elements(): name: test rule authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process examples: - foo1234 - bar5678 @@ -59,7 +63,9 @@ def test_rule_reformat_indentation(): name: test rule authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process examples: - foo1234 - bar5678 @@ -83,7 +89,9 @@ def test_rule_reformat_order(): examples: - foo1234 - bar5678 - scope: function + scopes: + static: function + dynamic: process name: test rule features: - and: @@ -107,7 +115,9 @@ def test_rule_reformat_meta_update(): examples: - foo1234 - bar5678 - scope: function + scopes: + static: function + dynamic: process name: AAAA features: - and: @@ -131,7 +141,9 @@ def test_rule_reformat_string_description(): name: test rule authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process features: - and: - string: foo diff --git a/tests/test_freeze_dynamic.py b/tests/test_freeze_dynamic.py new file mode 100644 index 000000000..b3087c092 --- /dev/null +++ b/tests/test_freeze_dynamic.py @@ -0,0 +1,165 @@ +# Copyright (C) 2023 Mandiant, Inc. All Rights Reserved. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: [package root]/LICENSE.txt +# Unless required by applicable law or agreed to in writing, software distributed under the License +# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and limitations under the License. +import textwrap +from typing import List +from pathlib import Path + +import fixtures + +import capa.main +import capa.rules +import capa.helpers +import capa.features.file +import capa.features.insn +import capa.features.common +import capa.features.freeze +import capa.features.basicblock +import capa.features.extractors.null +import capa.features.extractors.base_extractor +from capa.features.address import Address, AbsoluteVirtualAddress +from capa.features.extractors.base_extractor import ( + SampleHashes, + ThreadHandle, + ProcessHandle, + ThreadAddress, + ProcessAddress, + DynamicCallAddress, + DynamicFeatureExtractor, +) + +EXTRACTOR = capa.features.extractors.null.NullDynamicFeatureExtractor( + base_address=AbsoluteVirtualAddress(0x401000), + sample_hashes=SampleHashes( + md5="6eb7ee7babf913d75df3f86c229df9e7", + sha1="2a082494519acd5130d5120fa48786df7275fdd7", + sha256="0c7d1a34eb9fd55bedbf37ba16e3d5dd8c1dd1d002479cc4af27ef0f82bb4792", + ), + global_features=[], + file_features=[ + (AbsoluteVirtualAddress(0x402345), capa.features.common.Characteristic("embedded pe")), + ], + processes={ + ProcessAddress(pid=1): capa.features.extractors.null.ProcessFeatures( + name="explorer.exe", + features=[], + threads={ + ThreadAddress(ProcessAddress(pid=1), tid=1): capa.features.extractors.null.ThreadFeatures( + features=[], + calls={ + DynamicCallAddress( + thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=1 + ): capa.features.extractors.null.CallFeatures( + name="CreateFile(12)", + features=[ + ( + DynamicCallAddress(thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=1), + capa.features.insn.API("CreateFile"), + ), + ( + DynamicCallAddress(thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=1), + capa.features.insn.Number(12), + ), + ], + ), + DynamicCallAddress( + thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=2 + ): capa.features.extractors.null.CallFeatures( + name="WriteFile()", + features=[ + ( + DynamicCallAddress(thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=2), + capa.features.insn.API("WriteFile"), + ), + ], + ), + }, + ), + }, + ), + }, +) + + +def addresses(s) -> List[Address]: + return sorted(i.address for i in s) + + +def test_null_feature_extractor(): + ph = ProcessHandle(ProcessAddress(pid=1), None) + th = ThreadHandle(ThreadAddress(ProcessAddress(pid=1), tid=1), None) + + assert addresses(EXTRACTOR.get_processes()) == [ProcessAddress(pid=1)] + assert addresses(EXTRACTOR.get_threads(ph)) == [ThreadAddress(ProcessAddress(pid=1), tid=1)] + assert addresses(EXTRACTOR.get_calls(ph, th)) == [ + DynamicCallAddress(thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=1), + DynamicCallAddress(thread=ThreadAddress(ProcessAddress(pid=1), tid=1), id=2), + ] + + rules = capa.rules.RuleSet( + [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: create file + scopes: + static: basic block + dynamic: call + features: + - and: + - api: CreateFile + """ + ) + ), + ] + ) + capabilities, _ = capa.main.find_capabilities(rules, EXTRACTOR) + assert "create file" in capabilities + + +def compare_extractors(a: DynamicFeatureExtractor, b: DynamicFeatureExtractor): + assert list(a.extract_file_features()) == list(b.extract_file_features()) + + assert addresses(a.get_processes()) == addresses(b.get_processes()) + for p in a.get_processes(): + assert addresses(a.get_threads(p)) == addresses(b.get_threads(p)) + assert sorted(set(a.extract_process_features(p))) == sorted(set(b.extract_process_features(p))) + + for t in a.get_threads(p): + assert addresses(a.get_calls(p, t)) == addresses(b.get_calls(p, t)) + assert sorted(set(a.extract_thread_features(p, t))) == sorted(set(b.extract_thread_features(p, t))) + + for c in a.get_calls(p, t): + assert sorted(set(a.extract_call_features(p, t, c))) == sorted(set(b.extract_call_features(p, t, c))) + + +def test_freeze_str_roundtrip(): + load = capa.features.freeze.loads + dump = capa.features.freeze.dumps + reanimated = load(dump(EXTRACTOR)) + compare_extractors(EXTRACTOR, reanimated) + + +def test_freeze_bytes_roundtrip(): + load = capa.features.freeze.load + dump = capa.features.freeze.dump + reanimated = load(dump(EXTRACTOR)) + compare_extractors(EXTRACTOR, reanimated) + + +def test_freeze_load_sample(tmpdir): + o = tmpdir.mkdir("capa").join("test.frz") + + extractor = fixtures.get_cape_extractor(fixtures.get_data_path_by_name("d46900")) + + Path(o.strpath).write_bytes(capa.features.freeze.dump(extractor)) + + null_extractor = capa.features.freeze.load(Path(o.strpath).read_bytes()) + + compare_extractors(extractor, null_extractor) diff --git a/tests/test_freeze.py b/tests/test_freeze_static.py similarity index 90% rename from tests/test_freeze.py rename to tests/test_freeze_static.py index cbc60b483..4674afc89 100644 --- a/tests/test_freeze.py +++ b/tests/test_freeze_static.py @@ -22,10 +22,15 @@ import capa.features.extractors.null import capa.features.extractors.base_extractor from capa.features.address import Address, AbsoluteVirtualAddress -from capa.features.extractors.base_extractor import BBHandle, FunctionHandle +from capa.features.extractors.base_extractor import BBHandle, SampleHashes, FunctionHandle -EXTRACTOR = capa.features.extractors.null.NullFeatureExtractor( +EXTRACTOR = capa.features.extractors.null.NullStaticFeatureExtractor( base_address=AbsoluteVirtualAddress(0x401000), + sample_hashes=SampleHashes( + md5="6eb7ee7babf913d75df3f86c229df9e7", + sha1="2a082494519acd5130d5120fa48786df7275fdd7", + sha256="0c7d1a34eb9fd55bedbf37ba16e3d5dd8c1dd1d002479cc4af27ef0f82bb4792", + ), global_features=[], file_features=[ (AbsoluteVirtualAddress(0x402345), capa.features.common.Characteristic("embedded pe")), @@ -83,7 +88,9 @@ def test_null_feature_extractor(): rule: meta: name: xor loop - scope: basic block + scopes: + static: basic block + dynamic: process features: - and: - characteristic: tight loop @@ -119,8 +126,8 @@ def compare_extractors(a, b): def test_freeze_str_roundtrip(): - load = capa.features.freeze.loads - dump = capa.features.freeze.dumps + load = capa.features.freeze.loads_static + dump = capa.features.freeze.dumps_static reanimated = load(dump(EXTRACTOR)) compare_extractors(EXTRACTOR, reanimated) @@ -133,7 +140,7 @@ def test_freeze_bytes_roundtrip(): def roundtrip_feature(feature): - assert feature == capa.features.freeze.feature_from_capa(feature).to_capa() + assert feature == capa.features.freeze.features.feature_from_capa(feature).to_capa() def test_serialize_features(): diff --git a/tests/test_main.py b/tests/test_main.py index c6deb1738..6d588dda1 100644 --- a/tests/test_main.py +++ b/tests/test_main.py @@ -6,8 +6,10 @@ # Unless required by applicable law or agreed to in writing, software distributed under the License # is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and limitations under the License. +import gzip import json import textwrap +from pathlib import Path import fixtures @@ -34,7 +36,9 @@ def test_main_single_rule(z9324d_extractor, tmpdir): rule: meta: name: test rule - scope: file + scopes: + static: file + dynamic: file authors: - test features: @@ -95,7 +99,9 @@ def test_ruleset(): rule: meta: name: file rule - scope: file + scopes: + static: file + dynamic: process features: - characteristic: embedded pe """ @@ -107,7 +113,9 @@ def test_ruleset(): rule: meta: name: function rule - scope: function + scopes: + static: function + dynamic: process features: - characteristic: tight loop """ @@ -119,291 +127,91 @@ def test_ruleset(): rule: meta: name: basic block rule - scope: basic block + scopes: + static: basic block + dynamic: process features: - characteristic: nzxor """ ) ), - ] - ) - assert len(rules.file_rules) == 1 - assert len(rules.function_rules) == 1 - assert len(rules.basic_block_rules) == 1 - - -def test_match_across_scopes_file_function(z9324d_extractor): - rules = capa.rules.RuleSet( - [ - # this rule should match on a function (0x4073F0) - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: install service - scope: function - examples: - - 9324d1a8ae37a36ae560c37448c9705a:0x4073F0 - features: - - and: - - api: advapi32.OpenSCManagerA - - api: advapi32.CreateServiceA - - api: advapi32.StartServiceA - """ - ) - ), - # this rule should match on a file feature capa.rules.Rule.from_yaml( textwrap.dedent( """ rule: meta: - name: .text section - scope: file - examples: - - 9324d1a8ae37a36ae560c37448c9705a + name: process rule + scopes: + static: file + dynamic: process features: - - section: .text + - string: "explorer.exe" """ ) ), - # this rule should match on earlier rule matches: - # - install service, with function scope - # - .text section, with file scope capa.rules.Rule.from_yaml( textwrap.dedent( """ - rule: - meta: - name: .text section and install service - scope: file - examples: - - 9324d1a8ae37a36ae560c37448c9705a - features: - - and: - - match: install service - - match: .text section - """ - ) - ), - ] - ) - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "install service" in capabilities - assert ".text section" in capabilities - assert ".text section and install service" in capabilities - - -def test_match_across_scopes(z9324d_extractor): - rules = capa.rules.RuleSet( - [ - # this rule should match on a basic block (including at least 0x403685) - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: tight loop - scope: basic block - examples: - - 9324d1a8ae37a36ae560c37448c9705a:0x403685 - features: - - characteristic: tight loop - """ + rule: + meta: + name: thread rule + scopes: + static: function + dynamic: thread + features: + - api: RegDeleteKey + """ ) ), - # this rule should match on a function (0x403660) - # based on API, as well as prior basic block rule match capa.rules.Rule.from_yaml( textwrap.dedent( """ rule: meta: - name: kill thread loop - scope: function - examples: - - 9324d1a8ae37a36ae560c37448c9705a:0x403660 + name: test call subscope + scopes: + static: basic block + dynamic: thread features: - and: - - api: kernel32.TerminateThread - - api: kernel32.CloseHandle - - match: tight loop + - string: "explorer.exe" + - call: + - api: HttpOpenRequestW """ ) ), - # this rule should match on a file feature and a prior function rule match capa.rules.Rule.from_yaml( textwrap.dedent( """ rule: meta: - name: kill thread program - scope: file - examples: - - 9324d1a8ae37a36ae560c37448c9705a + name: test rule + scopes: + static: instruction + dynamic: call features: - and: - - section: .text - - match: kill thread loop + - or: + - api: socket + - and: + - os: linux + - mnemonic: syscall + - number: 41 = socket() + - number: 6 = IPPROTO_TCP + - number: 1 = SOCK_STREAM + - number: 2 = AF_INET """ ) ), ] ) - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "tight loop" in capabilities - assert "kill thread loop" in capabilities - assert "kill thread program" in capabilities - - -def test_subscope_bb_rules(z9324d_extractor): - rules = capa.rules.RuleSet( - [ - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: test rule - scope: function - features: - - and: - - basic block: - - characteristic: tight loop - """ - ) - ) - ] - ) - # tight loop at 0x403685 - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "test rule" in capabilities - - -def test_byte_matching(z9324d_extractor): - rules = capa.rules.RuleSet( - [ - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: byte match test - scope: function - features: - - and: - - bytes: ED 24 9E F4 52 A9 07 47 55 8E E1 AB 30 8E 23 61 - """ - ) - ) - ] - ) - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "byte match test" in capabilities - - -def test_com_feature_matching(z395eb_extractor): - rules = capa.rules.RuleSet( - [ - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: initialize IWebBrowser2 - scope: basic block - features: - - and: - - api: ole32.CoCreateInstance - - com/class: InternetExplorer #bytes: 01 DF 02 00 00 00 00 00 C0 00 00 00 00 00 00 46 = CLSID_InternetExplorer - - com/interface: IWebBrowser2 #bytes: 61 16 0C D3 AF CD D0 11 8A 3E 00 C0 4F C9 E2 6E = IID_IWebBrowser2 - """ - ) - ) - ] - ) - capabilities, meta = capa.main.find_capabilities(rules, z395eb_extractor) - assert "initialize IWebBrowser2" in capabilities - - -def test_count_bb(z9324d_extractor): - rules = capa.rules.RuleSet( - [ - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: count bb - namespace: test - scope: function - features: - - and: - - count(basic blocks): 1 or more - """ - ) - ) - ] - ) - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "count bb" in capabilities - - -def test_instruction_scope(z9324d_extractor): - # .text:004071A4 68 E8 03 00 00 push 3E8h - rules = capa.rules.RuleSet( - [ - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: push 1000 - namespace: test - scope: instruction - features: - - and: - - mnemonic: push - - number: 1000 - """ - ) - ) - ] - ) - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "push 1000" in capabilities - assert 0x4071A4 in {result[0] for result in capabilities["push 1000"]} - - -def test_instruction_subscope(z9324d_extractor): - # .text:00406F60 sub_406F60 proc near - # [...] - # .text:004071A4 68 E8 03 00 00 push 3E8h - rules = capa.rules.RuleSet( - [ - capa.rules.Rule.from_yaml( - textwrap.dedent( - """ - rule: - meta: - name: push 1000 on i386 - namespace: test - scope: function - features: - - and: - - arch: i386 - - instruction: - - mnemonic: push - - number: 1000 - """ - ) - ) - ] - ) - capabilities, meta = capa.main.find_capabilities(rules, z9324d_extractor) - assert "push 1000 on i386" in capabilities - assert 0x406F60 in {result[0] for result in capabilities["push 1000 on i386"]} + assert len(rules.file_rules) == 2 + assert len(rules.function_rules) == 2 + assert len(rules.basic_block_rules) == 2 + assert len(rules.instruction_rules) == 1 + assert len(rules.process_rules) == 4 + assert len(rules.thread_rules) == 2 + assert len(rules.call_rules) == 2 def test_fix262(pma16_01_extractor, capsys): @@ -492,3 +300,59 @@ def test_main_rd(): assert capa.main.main([path, "-j"]) == 0 assert capa.main.main([path, "-q"]) == 0 assert capa.main.main([path]) == 0 + + +def extract_cape_report(tmp_path: Path, gz: Path) -> Path: + report = tmp_path / "report.json" + report.write_bytes(gzip.decompress(gz.read_bytes())) + return report + + +def test_main_cape1(tmp_path): + path = extract_cape_report(tmp_path, fixtures.get_data_path_by_name("0000a657")) + + # TODO(williballenthin): use default rules set + # https://github.com/mandiant/capa/pull/1696 + rules = tmp_path / "rules" + rules.mkdir() + (rules / "create-or-open-registry-key.yml").write_text( + textwrap.dedent( + """ + rule: + meta: + name: create or open registry key + authors: + - testing + scopes: + static: instruction + dynamic: call + features: + - or: + - api: advapi32.RegOpenKey + - api: advapi32.RegOpenKeyEx + - api: advapi32.RegCreateKey + - api: advapi32.RegCreateKeyEx + - api: advapi32.RegOpenCurrentUser + - api: advapi32.RegOpenKeyTransacted + - api: advapi32.RegOpenUserClassesRoot + - api: advapi32.RegCreateKeyTransacted + - api: ZwOpenKey + - api: ZwOpenKeyEx + - api: ZwCreateKey + - api: ZwOpenKeyTransacted + - api: ZwOpenKeyTransactedEx + - api: ZwCreateKeyTransacted + - api: NtOpenKey + - api: NtCreateKey + - api: SHRegOpenUSKey + - api: SHRegCreateUSKey + - api: RtlCreateRegistryKey + """ + ) + ) + + assert capa.main.main([str(path), "-r", str(rules)]) == 0 + assert capa.main.main([str(path), "-q", "-r", str(rules)]) == 0 + assert capa.main.main([str(path), "-j", "-r", str(rules)]) == 0 + assert capa.main.main([str(path), "-v", "-r", str(rules)]) == 0 + assert capa.main.main([str(path), "-vv", "-r", str(rules)]) == 0 diff --git a/tests/test_match.py b/tests/test_match.py index 2c9928db3..8c348098f 100644 --- a/tests/test_match.py +++ b/tests/test_match.py @@ -43,6 +43,9 @@ def test_match_simple(): rule: meta: name: test rule + scopes: + static: function + dynamic: process namespace: testns1/testns2 features: - number: 100 @@ -63,6 +66,9 @@ def test_match_range_exact(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - count(number(100)): 2 """ @@ -87,7 +93,10 @@ def test_match_range_range(): """ rule: meta: - name: test rule + name: test rule + scopes: + static: function + dynamic: process features: - count(number(100)): (2, 3) """ @@ -117,6 +126,9 @@ def test_match_range_exact_zero(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - count(number(100)): 0 """ @@ -142,7 +154,10 @@ def test_match_range_with_zero(): """ rule: meta: - name: test rule + name: test rule + scopes: + static: function + dynamic: process features: - count(number(100)): (0, 1) """ @@ -169,6 +184,9 @@ def test_match_adds_matched_rule_feature(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - number: 100 """ @@ -187,6 +205,9 @@ def test_match_matched_rules(): rule: meta: name: test rule1 + scopes: + static: function + dynamic: process features: - number: 100 """ @@ -198,6 +219,9 @@ def test_match_matched_rules(): rule: meta: name: test rule2 + scopes: + static: function + dynamic: process features: - match: test rule1 """ @@ -232,6 +256,9 @@ def test_match_namespace(): rule: meta: name: CreateFile API + scopes: + static: function + dynamic: process namespace: file/create/CreateFile features: - api: CreateFile @@ -244,6 +271,9 @@ def test_match_namespace(): rule: meta: name: WriteFile API + scopes: + static: function + dynamic: process namespace: file/write features: - api: WriteFile @@ -256,6 +286,9 @@ def test_match_namespace(): rule: meta: name: file-create + scopes: + static: function + dynamic: process features: - match: file/create """ @@ -267,6 +300,9 @@ def test_match_namespace(): rule: meta: name: filesystem-any + scopes: + static: function + dynamic: process features: - match: file """ @@ -304,6 +340,9 @@ def test_match_substring(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - substring: abc @@ -355,6 +394,9 @@ def test_match_regex(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - string: /.*bbbb.*/ @@ -367,6 +409,9 @@ def test_match_regex(): rule: meta: name: rule with implied wildcards + scopes: + static: function + dynamic: process features: - and: - string: /bbbb/ @@ -379,6 +424,9 @@ def test_match_regex(): rule: meta: name: rule with anchor + scopes: + static: function + dynamic: process features: - and: - string: /^bbbb/ @@ -425,6 +473,9 @@ def test_match_regex_ignorecase(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - string: /.*bbbb.*/i @@ -448,6 +499,9 @@ def test_match_regex_complex(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - string: /.*HARDWARE\\Key\\key with spaces\\.*/i @@ -471,6 +525,9 @@ def test_match_regex_values_always_string(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - string: /123/ @@ -500,6 +557,9 @@ def test_match_not(): rule: meta: name: test rule + scopes: + static: function + dynamic: process namespace: testns1/testns2 features: - not: @@ -518,6 +578,9 @@ def test_match_not_not(): rule: meta: name: test rule + scopes: + static: function + dynamic: process namespace: testns1/testns2 features: - not: @@ -537,6 +600,9 @@ def test_match_operand_number(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - operand[0].number: 0x10 @@ -564,6 +630,9 @@ def test_match_operand_offset(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - operand[0].offset: 0x10 @@ -591,6 +660,9 @@ def test_match_property_access(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - property/read: System.IO.FileInfo::Length @@ -632,6 +704,9 @@ def test_match_os_any(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - and: diff --git a/tests/test_optimizer.py b/tests/test_optimizer.py index 20c098dec..68afc52c4 100644 --- a/tests/test_optimizer.py +++ b/tests/test_optimizer.py @@ -23,7 +23,9 @@ def test_optimizer_order(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process features: - and: - substring: "foo" diff --git a/tests/test_proto.py b/tests/test_proto.py index 6f0137fef..518c11ab1 100644 --- a/tests/test_proto.py +++ b/tests/test_proto.py @@ -46,7 +46,7 @@ def test_doc_to_pb2(request, rd_file): assert matches.meta.name == m.name assert cmp_optional(matches.meta.namespace, m.namespace) assert list(matches.meta.authors) == m.authors - assert capa.render.proto.scope_to_pb2(matches.meta.scope) == m.scope + assert capa.render.proto.scopes_to_pb2(matches.meta.scopes) == m.scopes assert len(matches.meta.attack) == len(m.attack) for rd_attack, proto_attack in zip(matches.meta.attack, m.attack): @@ -116,10 +116,27 @@ def test_addr_to_pb2(): def test_scope_to_pb2(): - assert capa.render.proto.scope_to_pb2(capa.rules.Scope(capa.rules.FILE_SCOPE)) == capa_pb2.SCOPE_FILE - assert capa.render.proto.scope_to_pb2(capa.rules.Scope(capa.rules.FUNCTION_SCOPE)) == capa_pb2.SCOPE_FUNCTION - assert capa.render.proto.scope_to_pb2(capa.rules.Scope(capa.rules.BASIC_BLOCK_SCOPE)) == capa_pb2.SCOPE_BASIC_BLOCK - assert capa.render.proto.scope_to_pb2(capa.rules.Scope(capa.rules.INSTRUCTION_SCOPE)) == capa_pb2.SCOPE_INSTRUCTION + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.FILE) == capa_pb2.SCOPE_FILE + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.FUNCTION) == capa_pb2.SCOPE_FUNCTION + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.BASIC_BLOCK) == capa_pb2.SCOPE_BASIC_BLOCK + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.INSTRUCTION) == capa_pb2.SCOPE_INSTRUCTION + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.PROCESS) == capa_pb2.SCOPE_PROCESS + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.THREAD) == capa_pb2.SCOPE_THREAD + assert capa.render.proto.scope_to_pb2(capa.rules.Scope.CALL) == capa_pb2.SCOPE_CALL + + +def test_scopes_to_pb2(): + assert capa.render.proto.scopes_to_pb2( + capa.rules.Scopes.from_dict({"static": "file", "dynamic": "file"}) + ) == capa_pb2.Scopes( + static=capa_pb2.SCOPE_FILE, + dynamic=capa_pb2.SCOPE_FILE, + ) + assert capa.render.proto.scopes_to_pb2( + capa.rules.Scopes.from_dict({"static": "file", "dynamic": "unsupported"}) + ) == capa_pb2.Scopes( + static=capa_pb2.SCOPE_FILE, + ) def cmp_optional(a: Any, b: Any) -> bool: @@ -128,46 +145,85 @@ def cmp_optional(a: Any, b: Any) -> bool: return a == b -def assert_meta(meta: rd.Metadata, dst: capa_pb2.Metadata): - assert str(meta.timestamp) == dst.timestamp - assert meta.version == dst.version - if meta.argv is None: - assert [] == dst.argv - else: - assert list(meta.argv) == dst.argv +def assert_static_analyis(analysis: rd.StaticAnalysis, dst: capa_pb2.StaticAnalysis): + assert analysis.format == dst.format + assert analysis.arch == dst.arch + assert analysis.os == dst.os + assert analysis.extractor == dst.extractor + assert list(analysis.rules) == dst.rules - assert meta.sample.md5 == dst.sample.md5 - assert meta.sample.sha1 == dst.sample.sha1 - assert meta.sample.sha256 == dst.sample.sha256 - assert meta.sample.path == dst.sample.path + assert capa.render.proto.addr_to_pb2(analysis.base_address) == dst.base_address - assert meta.analysis.format == dst.analysis.format - assert meta.analysis.arch == dst.analysis.arch - assert meta.analysis.os == dst.analysis.os - assert meta.analysis.extractor == dst.analysis.extractor - assert list(meta.analysis.rules) == dst.analysis.rules - assert capa.render.proto.addr_to_pb2(meta.analysis.base_address) == dst.analysis.base_address - - assert len(meta.analysis.layout.functions) == len(dst.analysis.layout.functions) - for rd_f, proto_f in zip(meta.analysis.layout.functions, dst.analysis.layout.functions): + assert len(analysis.layout.functions) == len(dst.layout.functions) + for rd_f, proto_f in zip(analysis.layout.functions, dst.layout.functions): assert capa.render.proto.addr_to_pb2(rd_f.address) == proto_f.address assert len(rd_f.matched_basic_blocks) == len(proto_f.matched_basic_blocks) for rd_bb, proto_bb in zip(rd_f.matched_basic_blocks, proto_f.matched_basic_blocks): assert capa.render.proto.addr_to_pb2(rd_bb.address) == proto_bb.address - assert meta.analysis.feature_counts.file == dst.analysis.feature_counts.file - assert len(meta.analysis.feature_counts.functions) == len(dst.analysis.feature_counts.functions) - for rd_cf, proto_cf in zip(meta.analysis.feature_counts.functions, dst.analysis.feature_counts.functions): + assert analysis.feature_counts.file == dst.feature_counts.file + assert len(analysis.feature_counts.functions) == len(dst.feature_counts.functions) + for rd_cf, proto_cf in zip(analysis.feature_counts.functions, dst.feature_counts.functions): assert capa.render.proto.addr_to_pb2(rd_cf.address) == proto_cf.address assert rd_cf.count == proto_cf.count - assert len(meta.analysis.library_functions) == len(dst.analysis.library_functions) - for rd_lf, proto_lf in zip(meta.analysis.library_functions, dst.analysis.library_functions): + assert len(analysis.library_functions) == len(dst.library_functions) + for rd_lf, proto_lf in zip(analysis.library_functions, dst.library_functions): assert capa.render.proto.addr_to_pb2(rd_lf.address) == proto_lf.address assert rd_lf.name == proto_lf.name +def assert_dynamic_analyis(analysis: rd.DynamicAnalysis, dst: capa_pb2.DynamicAnalysis): + assert analysis.format == dst.format + assert analysis.arch == dst.arch + assert analysis.os == dst.os + assert analysis.extractor == dst.extractor + assert list(analysis.rules) == dst.rules + + assert len(analysis.layout.processes) == len(dst.layout.processes) + for rd_p, proto_p in zip(analysis.layout.processes, dst.layout.processes): + assert capa.render.proto.addr_to_pb2(rd_p.address) == proto_p.address + + assert len(rd_p.matched_threads) == len(proto_p.matched_threads) + for rd_t, proto_t in zip(rd_p.matched_threads, proto_p.matched_threads): + assert capa.render.proto.addr_to_pb2(rd_t.address) == proto_t.address + + assert analysis.feature_counts.processes == dst.feature_counts.processes + assert len(analysis.feature_counts.processes) == len(dst.feature_counts.processes) + for rd_cp, proto_cp in zip(analysis.feature_counts.processes, dst.feature_counts.processes): + assert capa.render.proto.addr_to_pb2(rd_cp.address) == proto_cp.address + assert rd_cp.count == proto_cp.count + + +def assert_meta(meta: rd.Metadata, dst: capa_pb2.Metadata): + assert isinstance(meta.analysis, rd.StaticAnalysis) + assert str(meta.timestamp) == dst.timestamp + assert meta.version == dst.version + if meta.argv is None: + assert [] == dst.argv + else: + assert list(meta.argv) == dst.argv + + assert meta.sample.md5 == dst.sample.md5 + assert meta.sample.sha1 == dst.sample.sha1 + assert meta.sample.sha256 == dst.sample.sha256 + assert meta.sample.path == dst.sample.path + + if meta.flavor == rd.Flavor.STATIC: + assert dst.flavor == capa_pb2.FLAVOR_STATIC + assert dst.WhichOneof("analysis2") == "static_analysis" + assert isinstance(meta.analysis, rd.StaticAnalysis) + assert_static_analyis(meta.analysis, dst.static_analysis) + elif meta.flavor == rd.Flavor.DYNAMIC: + assert dst.flavor == capa_pb2.FLAVOR_DYNAMIC + assert dst.WhichOneof("analysis2") == "dynamic_analysis" + assert isinstance(meta.analysis, rd.DynamicAnalysis) + assert_dynamic_analyis(meta.analysis, dst.dynamic_analysis) + else: + assert_never(dst.flavor) + + def assert_match(ma: rd.Match, mb: capa_pb2.Match): assert ma.success == mb.success @@ -318,20 +374,22 @@ def assert_round_trip(doc: rd.ResultDocument): # show the round trip works # first by comparing the objects directly, # which works thanks to pydantic model equality. + assert one.meta == two.meta + assert one.rules == two.rules assert one == two + # second by showing their protobuf representations are the same. - assert capa.render.proto.doc_to_pb2(one).SerializeToString(deterministic=True) == capa.render.proto.doc_to_pb2( - two - ).SerializeToString(deterministic=True) + one_bytes = capa.render.proto.doc_to_pb2(one).SerializeToString(deterministic=True) + two_bytes = capa.render.proto.doc_to_pb2(two).SerializeToString(deterministic=True) + assert one_bytes == two_bytes # now show that two different versions are not equal. three = copy.deepcopy(two) three.meta.__dict__.update({"version": "0.0.0"}) assert one.meta.version != three.meta.version assert one != three - assert capa.render.proto.doc_to_pb2(one).SerializeToString(deterministic=True) != capa.render.proto.doc_to_pb2( - three - ).SerializeToString(deterministic=True) + three_bytes = capa.render.proto.doc_to_pb2(three).SerializeToString(deterministic=True) + assert one_bytes != three_bytes @pytest.mark.parametrize( @@ -343,6 +401,7 @@ def assert_round_trip(doc: rd.ResultDocument): pytest.param("a076114_rd"), pytest.param("pma0101_rd"), pytest.param("dotnet_1c444e_rd"), + pytest.param("dynamic_a0000a6_rd"), ], ) def test_round_trip(request, rd_file): diff --git a/tests/test_render.py b/tests/test_render.py index 8f89bc5dc..60d62149e 100644 --- a/tests/test_render.py +++ b/tests/test_render.py @@ -50,7 +50,9 @@ def test_render_meta_attack(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process authors: - foo att&ck: @@ -86,7 +88,9 @@ def test_render_meta_mbc(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process authors: - foo mbc: @@ -154,6 +158,35 @@ def test_render_vverbose_feature(feature, expected): captures={}, ) - capa.render.vverbose.render_feature(ostream, matches, feature, indent=0) + layout = capa.render.result_document.StaticLayout(functions=()) + + src = textwrap.dedent( + """ + rule: + meta: + name: test rule + authors: + - user@domain.com + scopes: + static: function + dynamic: process + examples: + - foo1234 + - bar5678 + features: + - and: + - number: 1 + - number: 2 + """ + ) + rule = capa.rules.Rule.from_yaml(src) + + rm = capa.render.result_document.RuleMatches( + meta=capa.render.result_document.RuleMetadata.from_capa(rule), + source=src, + matches=(), + ) + + capa.render.vverbose.render_feature(ostream, layout, rm, matches, feature, indent=0) assert ostream.getvalue().strip() == expected diff --git a/tests/test_rule_cache.py b/tests/test_rule_cache.py index ab6b1ab04..0206e936d 100644 --- a/tests/test_rule_cache.py +++ b/tests/test_rule_cache.py @@ -20,7 +20,9 @@ name: test rule authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process examples: - foo1234 - bar5678 @@ -40,7 +42,9 @@ name: test rule 2 authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process examples: - foo1234 - bar5678 diff --git a/tests/test_rules.py b/tests/test_rules.py index a8f3f8e38..0683526c4 100644 --- a/tests/test_rules.py +++ b/tests/test_rules.py @@ -16,7 +16,7 @@ import capa.features.address from capa.engine import Or from capa.features.file import FunctionName -from capa.features.insn import Number, Offset, Property +from capa.features.insn import API, Number, Offset, Property from capa.features.common import ( OS, OS_LINUX, @@ -39,7 +39,9 @@ def test_rule_ctor(): - r = capa.rules.Rule("test rule", capa.rules.FUNCTION_SCOPE, Or([Number(1)]), {}) + r = capa.rules.Rule( + "test rule", capa.rules.Scopes(capa.rules.Scope.FUNCTION, capa.rules.Scope.FILE), Or([Number(1)]), {} + ) assert bool(r.evaluate({Number(0): {ADDR1}})) is False assert bool(r.evaluate({Number(1): {ADDR2}})) is True @@ -52,7 +54,9 @@ def test_rule_yaml(): name: test rule authors: - user@domain.com - scope: function + scopes: + static: function + dynamic: process examples: - foo1234 - bar5678 @@ -75,6 +79,9 @@ def test_rule_yaml_complex(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - and: @@ -99,6 +106,9 @@ def test_rule_descriptions(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - description: and description @@ -143,6 +153,9 @@ def test_invalid_rule_statement_descriptions(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - number: 1 = This is the number 1 @@ -159,6 +172,9 @@ def test_rule_yaml_not(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - number: 1 @@ -177,6 +193,9 @@ def test_rule_yaml_count(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - count(number(100)): 1 """ @@ -193,6 +212,9 @@ def test_rule_yaml_count_range(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - count(number(100)): (1, 2) """ @@ -210,6 +232,9 @@ def test_rule_yaml_count_string(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - count(string(foo)): 2 """ @@ -229,6 +254,9 @@ def test_invalid_rule_feature(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - foo: true """ @@ -242,7 +270,9 @@ def test_invalid_rule_feature(): rule: meta: name: test rule - scope: file + scopes: + static: file + dynamic: process features: - characteristic: nzxor """ @@ -256,7 +286,9 @@ def test_invalid_rule_feature(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: thread features: - characteristic: embedded pe """ @@ -270,7 +302,9 @@ def test_invalid_rule_feature(): rule: meta: name: test rule - scope: basic block + scopes: + static: basic block + dynamic: thread features: - characteristic: embedded pe """ @@ -278,6 +312,252 @@ def test_invalid_rule_feature(): ) +def test_multi_scope_rules_features(): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: function + dynamic: process + features: + - or: + - api: write + - and: + - os: linux + - mnemonic: syscall + - number: 1 = write + """ + ) + ) + + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: function + dynamic: process + features: + - or: + - api: read + - and: + - os: linux + - mnemonic: syscall + - number: 0 = read + """ + ) + ) + + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: instruction + dynamic: call + features: + - and: + - or: + - api: socket + - and: + - os: linux + - mnemonic: syscall + - number: 41 = socket() + - number: 6 = IPPROTO_TCP + - number: 1 = SOCK_STREAM + - number: 2 = AF_INET + """ + ) + ) + + +def test_rules_flavor_filtering(): + rules = [ + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: static rule + scopes: + static: function + dynamic: unsupported + features: + - api: CreateFileA + """ + ) + ), + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: dynamic rule + scopes: + static: unsupported + dynamic: thread + features: + - api: CreateFileA + """ + ) + ), + ] + + static_rules = capa.rules.RuleSet([r for r in rules if r.scopes.static is not None]) + dynamic_rules = capa.rules.RuleSet([r for r in rules if r.scopes.dynamic is not None]) + + # only static rule + assert len(static_rules) == 1 + # only dynamic rule + assert len(dynamic_rules) == 1 + + +def test_meta_scope_keywords(): + static_scopes = sorted([e.value for e in capa.rules.STATIC_SCOPES]) + dynamic_scopes = sorted([e.value for e in capa.rules.DYNAMIC_SCOPES]) + + for static_scope in static_scopes: + for dynamic_scope in dynamic_scopes: + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + f""" + rule: + meta: + name: test rule + scopes: + static: {static_scope} + dynamic: {dynamic_scope} + features: + - or: + - format: pe + """ + ) + ) + + # its also ok to specify "unsupported" + for static_scope in static_scopes: + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + f""" + rule: + meta: + name: test rule + scopes: + static: {static_scope} + dynamic: unsupported + features: + - or: + - format: pe + """ + ) + ) + for dynamic_scope in dynamic_scopes: + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + f""" + rule: + meta: + name: test rule + scopes: + static: unsupported + dynamic: {dynamic_scope} + features: + - or: + - format: pe + """ + ) + ) + + # its also ok to specify "unspecified" + for static_scope in static_scopes: + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + f""" + rule: + meta: + name: test rule + scopes: + static: {static_scope} + dynamic: unspecified + features: + - or: + - format: pe + """ + ) + ) + for dynamic_scope in dynamic_scopes: + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + f""" + rule: + meta: + name: test rule + scopes: + static: unspecified + dynamic: {dynamic_scope} + features: + - or: + - format: pe + """ + ) + ) + + # but at least one scope must be specified + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: {} + features: + - or: + - format: pe + """ + ) + ) + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: unsupported + dynamic: unsupported + features: + - or: + - format: pe + """ + ) + ) + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: unspecified + dynamic: unspecified + features: + - or: + - format: pe + """ + ) + ) + + def test_lib_rules(): rules = capa.rules.RuleSet( [ @@ -287,6 +567,9 @@ def test_lib_rules(): rule: meta: name: a lib rule + scopes: + static: function + dynamic: process lib: true features: - api: CreateFileA @@ -299,6 +582,9 @@ def test_lib_rules(): rule: meta: name: a standard rule + scopes: + static: function + dynamic: process lib: false features: - api: CreateFileW @@ -319,8 +605,10 @@ def test_subscope_rules(): """ rule: meta: - name: test rule - scope: file + name: test function subscope + scopes: + static: file + dynamic: process features: - and: - characteristic: embedded pe @@ -330,17 +618,84 @@ def test_subscope_rules(): - characteristic: loop """ ) - ) + ), + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test process subscope + scopes: + static: file + dynamic: file + features: + - and: + - import: WININET.dll.HttpOpenRequestW + - process: + - and: + - substring: "http://" + """ + ) + ), + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test thread subscope + scopes: + static: file + dynamic: process + features: + - and: + - string: "explorer.exe" + - thread: + - api: HttpOpenRequestW + """ + ) + ), + capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test call subscope + scopes: + static: basic block + dynamic: thread + features: + - and: + - string: "explorer.exe" + - call: + - api: HttpOpenRequestW + """ + ) + ), ] ) - # the file rule scope will have one rules: - # - `test rule` - assert len(rules.file_rules) == 1 - - # the function rule scope have one rule: - # - the rule on which `test rule` depends + # the file rule scope will have four rules: + # - `test function subscope`, `test process subscope` and + # `test thread subscope` for the static scope + # - and `test process subscope` for both scopes + assert len(rules.file_rules) == 3 + + # the function rule scope have two rule: + # - the rule on which `test function subscope` depends assert len(rules.function_rules) == 1 + # the process rule scope has three rules: + # - the rule on which `test process subscope` depends, + assert len(rules.process_rules) == 3 + + # the thread rule scope has two rule: + # - the rule on which `test thread subscope` depends + # - the `test call subscope` rule + assert len(rules.thread_rules) == 2 + + # the call rule scope has one rule: + # - the rule on which `test call subcsope` depends + assert len(rules.call_rules) == 1 + def test_duplicate_rules(): with pytest.raises(capa.rules.InvalidRule): @@ -352,6 +707,9 @@ def test_duplicate_rules(): rule: meta: name: rule-name + scopes: + static: function + dynamic: process features: - api: CreateFileA """ @@ -363,6 +721,9 @@ def test_duplicate_rules(): rule: meta: name: rule-name + scopes: + static: function + dynamic: process features: - api: CreateFileW """ @@ -382,6 +743,9 @@ def test_missing_dependency(): rule: meta: name: dependent rule + scopes: + static: function + dynamic: process features: - match: missing rule """ @@ -399,6 +763,9 @@ def test_invalid_rules(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - characteristic: number(1) """ @@ -412,6 +779,9 @@ def test_invalid_rules(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - characteristic: count(number(100)) """ @@ -426,6 +796,9 @@ def test_invalid_rules(): rule: meta: name: test rule + scopes: + static: function + dynamic: process att&ck: Tactic::Technique::Subtechnique [Identifier] features: - number: 1 @@ -439,12 +812,75 @@ def test_invalid_rules(): rule: meta: name: test rule + scopes: + static: function + dynamic: process mbc: Objective::Behavior::Method [Identifier] features: - number: 1 """ ) ) + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: basic block + behavior: process + features: + - number: 1 + """ + ) + ) + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + legacy: basic block + dynamic: process + features: + - number: 1 + """ + ) + ) + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: process + dynamic: process + features: + - number: 1 + """ + ) + ) + with pytest.raises(capa.rules.InvalidRule): + _ = capa.rules.Rule.from_yaml( + textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: basic block + dynamic: function + features: + - number: 1 + """ + ) + ) def test_number_symbol(): @@ -453,6 +889,9 @@ def test_number_symbol(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - number: 1 @@ -480,6 +919,9 @@ def test_count_number_symbol(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - count(number(2 = symbol name)): 1 @@ -495,6 +937,28 @@ def test_count_number_symbol(): assert bool(r.evaluate({Number(0x100, description="symbol name"): {ADDR1, ADDR2, ADDR3}})) is True +def test_count_api(): + rule = textwrap.dedent( + """ + rule: + meta: + name: test rule + scopes: + static: function + dynamic: thread + features: + - or: + - count(api(kernel32.CreateFileA)): 1 + """ + ) + r = capa.rules.Rule.from_yaml(rule) + # apis including their DLL names are not extracted anymore + assert bool(r.evaluate({API("kernel32.CreateFileA"): set()})) is False + assert bool(r.evaluate({API("kernel32.CreateFile"): set()})) is False + assert bool(r.evaluate({API("CreateFile"): {ADDR1}})) is False + assert bool(r.evaluate({API("CreateFileA"): {ADDR1}})) is True + + def test_invalid_number(): with pytest.raises(capa.rules.InvalidRule): _ = capa.rules.Rule.from_yaml( @@ -503,6 +967,9 @@ def test_invalid_number(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - number: "this is a string" """ @@ -516,6 +983,9 @@ def test_invalid_number(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - number: 2= """ @@ -529,6 +999,9 @@ def test_invalid_number(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - number: symbol name = 2 """ @@ -542,6 +1015,9 @@ def test_offset_symbol(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - and: - offset: 1 @@ -566,6 +1042,9 @@ def test_count_offset_symbol(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - count(offset(2 = symbol name)): 1 @@ -589,6 +1068,9 @@ def test_invalid_offset(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - offset: "this is a string" """ @@ -602,6 +1084,9 @@ def test_invalid_offset(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - offset: 2= """ @@ -615,6 +1100,9 @@ def test_invalid_offset(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - offset: symbol name = 2 """ @@ -630,6 +1118,9 @@ def test_invalid_string_values_int(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - string: 123 """ @@ -643,6 +1134,9 @@ def test_invalid_string_values_int(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - string: 0x123 """ @@ -656,6 +1150,9 @@ def test_explicit_string_values_int(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - string: "123" @@ -674,6 +1171,9 @@ def test_string_values_special_characters(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - string: "hello\\r\\nworld" @@ -693,6 +1193,9 @@ def test_substring_feature(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - substring: abc @@ -713,6 +1216,9 @@ def test_substring_description(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - or: - substring: abc @@ -733,6 +1239,9 @@ def test_filter_rules(): rule: meta: name: rule 1 + scopes: + static: function + dynamic: process authors: - joe features: @@ -746,6 +1255,9 @@ def test_filter_rules(): rule: meta: name: rule 2 + scopes: + static: function + dynamic: process features: - string: joe """ @@ -767,6 +1279,9 @@ def test_filter_rules_dependencies(): rule: meta: name: rule 1 + scopes: + static: function + dynamic: process features: - match: rule 2 """ @@ -778,6 +1293,9 @@ def test_filter_rules_dependencies(): rule: meta: name: rule 2 + scopes: + static: function + dynamic: process features: - match: rule 3 """ @@ -789,6 +1307,9 @@ def test_filter_rules_dependencies(): rule: meta: name: rule 3 + scopes: + static: function + dynamic: process features: - api: CreateFile """ @@ -813,6 +1334,9 @@ def test_filter_rules_missing_dependency(): rule: meta: name: rule 1 + scopes: + static: function + dynamic: process authors: - joe features: @@ -832,6 +1356,9 @@ def test_rules_namespace_dependencies(): rule: meta: name: rule 1 + scopes: + static: function + dynamic: process namespace: ns1/nsA features: - api: CreateFile @@ -844,6 +1371,9 @@ def test_rules_namespace_dependencies(): rule: meta: name: rule 2 + scopes: + static: function + dynamic: process namespace: ns1/nsB features: - api: CreateFile @@ -856,6 +1386,9 @@ def test_rules_namespace_dependencies(): rule: meta: name: rule 3 + scopes: + static: function + dynamic: process features: - match: ns1/nsA """ @@ -867,6 +1400,9 @@ def test_rules_namespace_dependencies(): rule: meta: name: rule 4 + scopes: + static: function + dynamic: process features: - match: ns1 """ @@ -891,7 +1427,9 @@ def test_function_name_features(): rule: meta: name: test rule - scope: file + scopes: + static: file + dynamic: process features: - and: - function-name: strcpy @@ -913,7 +1451,9 @@ def test_os_features(): rule: meta: name: test rule - scope: file + scopes: + static: file + dynamic: process features: - and: - os: windows @@ -931,7 +1471,9 @@ def test_format_features(): rule: meta: name: test rule - scope: file + scopes: + static: file + dynamic: process features: - and: - format: pe @@ -949,7 +1491,9 @@ def test_arch_features(): rule: meta: name: test rule - scope: file + scopes: + static: file + dynamic: process features: - and: - arch: amd64 @@ -968,6 +1512,9 @@ def test_property_access(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - property/read: System.IO.FileInfo::Length """ @@ -986,6 +1533,9 @@ def test_property_access_symbol(): rule: meta: name: test rule + scopes: + static: function + dynamic: process features: - property/read: System.IO.FileInfo::Length = some property """ @@ -1012,6 +1562,9 @@ def test_translate_com_features(): rule: meta: name: test rule + scopes: + static: basic block + dynamic: call features: - com/class: WICPngDecoder # 389ea17b-5078-4cde-b6ef-25c15175c751 WICPngDecoder diff --git a/tests/test_rules_insn_scope.py b/tests/test_rules_insn_scope.py index c6dd3fd73..5dbef6f47 100644 --- a/tests/test_rules_insn_scope.py +++ b/tests/test_rules_insn_scope.py @@ -20,9 +20,11 @@ def test_rule_scope_instruction(): rule: meta: name: test rule - scope: instruction + scopes: + static: instruction + dynamic: unsupported features: - - and: + - and: - mnemonic: mov - arch: i386 - os: windows @@ -37,7 +39,9 @@ def test_rule_scope_instruction(): rule: meta: name: test rule - scope: instruction + scopes: + static: instruction + dynamic: unsupported features: - characteristic: embedded pe """ @@ -54,7 +58,9 @@ def test_rule_subscope_instruction(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process features: - and: - instruction: @@ -83,7 +89,9 @@ def test_scope_instruction_implied_and(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process features: - and: - instruction: @@ -102,7 +110,9 @@ def test_scope_instruction_description(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process features: - and: - instruction: @@ -120,7 +130,9 @@ def test_scope_instruction_description(): rule: meta: name: test rule - scope: function + scopes: + static: function + dynamic: process features: - and: - instruction: diff --git a/tests/test_scripts.py b/tests/test_scripts.py index 7c91bc573..e8ed6c379 100644 --- a/tests/test_scripts.py +++ b/tests/test_scripts.py @@ -75,6 +75,7 @@ def run_program(script_path, args): return subprocess.run(args, stdout=subprocess.PIPE) +@pytest.mark.xfail(reason="result document test files haven't been updated yet") def test_proto_conversion(tmp_path): t = tmp_path / "proto-test" t.mkdir() @@ -98,7 +99,9 @@ def test_detect_duplicate_features(tmpdir): rule: meta: name: Test Rule 0 - scope: function + scopes: + static: function + dynamic: process features: - and: - number: 1 @@ -113,6 +116,9 @@ def test_detect_duplicate_features(tmpdir): rule: meta: name: Test Rule 1 + scopes: + static: function + dynamic: process features: - or: - string: unique @@ -132,6 +138,9 @@ def test_detect_duplicate_features(tmpdir): rule: meta: name: Test Rule 2 + scopes: + static: function + dynamic: process features: - and: - string: "sites.ini" @@ -146,6 +155,9 @@ def test_detect_duplicate_features(tmpdir): rule: meta: name: Test Rule 3 + scopes: + static: function + dynamic: process features: - or: - not: @@ -161,6 +173,9 @@ def test_detect_duplicate_features(tmpdir): rule: meta: name: Test Rule 4 + scopes: + static: function + dynamic: process features: - not: - string: "expa"