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<meta name="description" content="本文主要参考博客： Android4.0内存Dex数据动态加载技术APK加壳【2】内存加载dex实现详解 CSDN的大牛写的博客太简洁了，内存动态加载主要参考taoyuanxiaoqi的博文，写得比较详细。我的上一篇文章提到使用DexClassLoader函数，把apk文件加载进来，不过这样的做法会导致apk文件躺在文件系统中，这样的做法并不安全，在4.0之后，可以通过封装Dalvik_dal">
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<meta property="og:description" content="本文主要参考博客： Android4.0内存Dex数据动态加载技术APK加壳【2】内存加载dex实现详解 CSDN的大牛写的博客太简洁了，内存动态加载主要参考taoyuanxiaoqi的博文，写得比较详细。我的上一篇文章提到使用DexClassLoader函数，把apk文件加载进来，不过这样的做法会导致apk文件躺在文件系统中，这样的做法并不安全，在4.0之后，可以通过封装Dalvik_dal">
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Android APK加壳技术的研究-内存动态加载
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<p>本文主要参考博客：</p>
<blockquote>
<p><a href="http://blog.csdn.net/androidsecurity/article/details/9674251" target="_blank" rel="noopener">Android4.0内存Dex数据动态加载技术</a><br><a href="http://taoyuanxiaoqi.com/2015/01/16/apkshell2/" target="_blank" rel="noopener">APK加壳【2】内存加载dex实现详解</a></p>
</blockquote>
<p>CSDN的大牛写的博客太简洁了，内存动态加载主要参考taoyuanxiaoqi的博文，写得比较详细。我的上一篇文章提到使用<code>DexClassLoader</code>函数，把apk文件加载进来，不过这样的做法会导致apk文件躺在文件系统中，这样的做法并不安全，在4.0之后，可以通过封装<code>Dalvik_dalvik_system_DexFile_openDexFile_bytearray</code>函数，可以在解密出dex文件的byteArray数组后，不需要保存到文件系统的路径上，直接通过4.0的函数在内存中读取。<br>参考博客他们的做法是，通过修改<code>DexShellTool</code>，并不是把<code>payload.apk</code>拼接到<code>unshell.dex</code>的后面，只是把<code>payload.apk</code>的<code>classes.dex</code>拼接到<code>unshell.dex</code>的后面。然后通过读取出<code>classes.dex</code>数组，并不保存到文件系统中，实现在内存中动态加载。<br>但是我比较懒，不想修改<code>DexShellTool</code>，还是把<code>payload.apk</code>拼接到后面，然后把<code>payload.apk</code>解压放到文件系统中，然后把里面的<code>classes.dex</code>数组读出来，这样进行动态加载，主要是想验证<code>Dalvik_dalvik_system_DexFile_openDexFile_bytearray</code>函数，文件系统还是躺着一个apk。</p>
<a id="more"></a>
<h3 id="配置环境"><a href="#配置环境" class="headerlink" title="配置环境"></a>配置环境</h3><p>本文的编译环境如下：</p>
<ul>
<li>Android Studio 1.2.1.1</li>
<li>JDK 1.7.0_79</li>
<li>SDK</li>
<li>NDK</li>
</ul>
<p>跟我的上一篇文章的环境是一样的，由于taoyuanxiaoqi的博文写的比较详细，代码我就不一一copy了，主要说一下编译过程中可能由于编译版本不同而提示的错误。 建立一个<code>com.droider.dexunshellram</code>的project，app里面的<code>build.gradle</code>如下，<code>minSdkVersion</code>为14，安卓4.0。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">apply plugin: 'com.android.application'</span><br><span class="line"></span><br><span class="line">android {</span><br><span class="line"> compileSdkVersion 22</span><br><span class="line"> buildToolsVersion "22.0.1"</span><br><span class="line"></span><br><span class="line"> defaultConfig {</span><br><span class="line"> applicationId "com.droider.dexunshellram"</span><br><span class="line"> minSdkVersion 14</span><br><span class="line"> targetSdkVersion 22</span><br><span class="line"> versionCode 1</span><br><span class="line"> versionName "1.0"</span><br><span class="line"></span><br><span class="line"> ndk {</span><br><span class="line"> moduleName "unshellram"</span><br><span class="line"> abiFilters "armeabi-v7a"</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> buildTypes {</span><br><span class="line"> release {</span><br><span class="line"> minifyEnabled false</span><br><span class="line"> proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">dependencies {</span><br><span class="line"> compile fileTree(dir: 'libs', include: ['*.jar'])</span><br><span class="line"> compile 'com.android.support:appcompat-v7:22.1.1'</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><code>AndroidManifest.xml</code>如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><manifest xmlns:android="http://schemas.android.com/apk/res/android"</span><br><span class="line"> package="com.droider.dexunshellram"></span><br><span class="line"> <application</span><br><span class="line"> android:debuggable="true"</span><br><span class="line"> android:icon="@drawable/ic_launcher"</span><br><span class="line"> android:label="@string/app_name"</span><br><span class="line"> android:theme="@style/AppTheme"</span><br><span class="line"> android:name="com.droider.dexunshellram.ProxyApplication"></span><br><span class="line"> <meta-data android:name="APPLICATION_CLASS_NAME" android:value="android.app.Application"/></span><br><span class="line"> <activity</span><br><span class="line"> android:name="com.droider.crackme0201.MainActivity"</span><br><span class="line"> android:label="@string/title_activity_main" ></span><br><span class="line"> <intent-filter></span><br><span class="line"> <action android:name="android.intent.action.MAIN" /></span><br><span class="line"> <category android:name="android.intent.category.LAUNCHER" /></span><br><span class="line"> </intent-filter></span><br><span class="line"> </activity></span><br><span class="line"> </application></span><br><span class="line"></manifest></span><br></pre></td></tr></table></figure>
<h3 id="java层"><a href="#java层" class="headerlink" title="java层"></a>java层</h3><p>在jni文件的编写，基本上是没有提示错误的，完全参考第二篇taoyuanxiaoqi博主那样编写就行了，编写3个文件，分别是<code>com_droider_dexunshellram_unshellram.c</code>、<code>com_droider_dexunshellram_unshellram.h</code>和<code>dalvik_common.h</code>。 遇到的问题：</p>
<h4 id="问题1"><a href="#问题1" class="headerlink" title="问题1"></a>问题1</h4><p>在java层中，主要是基于我上一篇文章的<code>com.droider.dexunshell</code>应用修改。无意中发现上一篇文章的<code>RefInvoke.java</code>有漏洞，因为taoyuanxiaoqi博主在<code>DynamicDexClassLoader</code>中使用了<code>import com.eebbk.mingming.k7utils.ReflectUtils</code>;，应该是别人写的反射函数，我想用回自己的<code>RefInvoke</code>。但是上一篇文章中CSDN博主的<code>RefInvoke</code>写法有问题。应该在<code>invokeStaticMethod</code>函数中加入<code>method.setAccessible(true)</code>;</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">public static Object invokeStaticMethod(String class_name, String method_name, Class[] pareTyple, Object[] pareVaules){</span><br><span class="line"></span><br><span class="line"> try {</span><br><span class="line"> Class obj_class = Class.forName(class_name);</span><br><span class="line"> Method method = obj_class.getDeclaredMethod(method_name, pareTyple);</span><br><span class="line"> method.setAccessible(true);</span><br></pre></td></tr></table></figure>
<h4 id="问题2"><a href="#问题2" class="headerlink" title="问题2"></a>问题2</h4><p>在<code>DynamicDexClassLoader.java</code>中，需要把<code>defineClass</code>的<code>defineClass</code>改成<code>defineClassNative</code>，要不会提示找不到<code>defineClass</code>的错误。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">private Class defineClass(String name, ClassLoader loader, int cookie) {</span><br><span class="line"> return (Class) RefInvoke.invokeStaticMethod(DexFile.class.getCanonicalName(),</span><br><span class="line"> "defineClassNative", new Class[]{String.class, ClassLoader.class,</span><br><span class="line"> int.class}, new Object[]{name, loader, cookie});</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="问题3"><a href="#问题3" class="headerlink" title="问题3"></a>问题3</h4><p>在<code>DynamicDexClassLoader.java</code>的<code>findClass</code>函数中，需要加一个<code>break</code>和注释两行函数，要不会一直不断<code>defineClass</code>。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"> protected Class findClass(String name) throws ClassNotFoundException {</span><br><span class="line"> ……</span><br><span class="line"> for (int z = 0; z < as.length; z++) {</span><br><span class="line"> Log.d(TAG, "findClass-as[z]" + as[z]);</span><br><span class="line"> if (as[z].equals(name)) {</span><br><span class="line"> Log.d(TAG, "findClass-name" + as[z]);</span><br><span class="line"> cls = defineClass(as[z].replace('.', '/'),</span><br><span class="line"> mContext.getClassLoader(), cookie);</span><br><span class="line"> break;</span><br><span class="line"> } else {</span><br><span class="line">// defineClass(as[z].replace('.', '/'), mContext.getClassLoader(),</span><br><span class="line">// cookie);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> ……</span><br></pre></td></tr></table></figure>
<p>所以在Java层中按taoyuanxiaoqi博主的文章相应修改一下<code>ProxyApplication.java</code>和<code>RefInvoke.java</code>。然后添加<code>DynamicDexClassLoader.java</code>和<code>unshellram.java</code>。就大功告成，其实上面这些错误的解决方法是在taoyuanxiaoqi的博文评论中找到的。<br>编译通过后，也需要向我上一篇文章一样，运行一下<code>DexShellTool</code>，把apk拼接到后面，再重新签名安装，apk为上一篇博文的<code>crackme0201</code>。<br><code>dexunshellram</code>程序app文件夹的代码包<a href="https://www.mak-blog.com/download/android/dexunshellram.zip" title="dexunshellram.zip">链接</a>。</p>
<p>搞定，收工。</p>
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