Adding two new techniques to the rule - findmnt - mlocate #5091
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Summary of the Pull Request
Techniqe 01 : findmnt
Identifying Network Shares
If the system uses network file systems (e.g., NFS, CIFS), findmnt can help locate paths to remote shares. Attackers may then attempt to access these shares for lateral movement or data exfiltration.
Example:
findmnt -t nfs
Output:
TARGET SOURCE FSTYPE OPTIONS
/mnt/share 192.168.1.100:/nfs nfs rw,vers=4.2
Adversary Usage: They might use the target IP (192.168.1.100) and path (/nfs) to probe the network share for misconfigurations or weak credentials.
log:
Nov 24 17:34:24 caldera-virtual-machine sysmon: 154100x8000000000000000251336Linux-Sysmon/Operationalcaldera-virtual-machine-2024-11-24 16:34:23.272{36fe7a82-558f-6743-6190-44f572550000}4214/usr/bin/findmnt-----findmnt -t nfs/home/calderacaldera{36fe7a82-0000-0000-e803-000000000000}10003no levelSHA256=d0a7b38954dbe00b6f7c733eb038eeefaf7c4c64bfbb1f346ffe6ce3dfd383bc{36fe7a82-1381-6743-d526-4b5458550000}2249/usr/bin/bashbashcaldera
host = caldera-virtual-machinesource = Syslog:Linux-Sysmon/Operationalsourcetype = sysmon_linux
Techniqe 02 : mlocate
Locating Sensitive Files
Attackers might search for files containing sensitive information, such as:
Passwords
Private keys
Configuration files
Database dumps
Example:
locate password
Output:
/etc/passwd
/home/user/passwords.txt
/var/www/html/backup_passwords.zip
Adversary Usage: The attacker might target /home/user/passwords.txt or backup_passwords.zip for credential theft.
log:
Nov 24 19:12:03 caldera-virtual-machine sysmon: 154100x8000000000000000251852Linux-Sysmon/Operationalcaldera-virtual-machine-2024-11-24 18:12:02.906{36fe7a82-6c72-6743-e17c-4b4151560000}5541/usr/bin/mlocate-----locate password/home/calderacaldera{36fe7a82-0000-0000-e803-000000000000}10003no levelSHA256=eb02f4b55245a599ca9047aa47fc07d064ffb98d45cbb0359a65b3c0fd5619ad{36fe7a82-1381-6743-d526-4b5458550000}2249/usr/bin/bashbashcaldera
host = caldera-virtual-machinesource = Syslog:Linux-Sysmon/Operationalsourcetype = sysmon_linux
Changelog
Example Log Event
Fixed Issues
SigmaHQ Rule Creation Conventions