Frida基础用法教学文档<\/h1>

一、Frida简介<\/h2>
Frida是一款强大的动态代码插桩工具，主要用于Android\/iOS\/macOS\/Linux\/Windows等平台的动态分析和逆向工程。它允许开发者通过JavaScript脚本来实时修改和监控目标应用程序的行为。<\/p>

二、环境准备<\/h2>

1. 所需工具<\/h3>

jadx<\/strong>：用于进行静态分析，也可以进行动态调试<\/li>
雷电模拟器9(Android 9)<\/strong>：建议使用root版本<\/li>
Frida<\/strong>：包含Frida客户端和Frida server<\/li>

adb工具<\/strong>：用于连接Android设备<\/li> <\/ul>
2. 环境配置步骤<\/h3>

确保adb连接正常：adb devices<\/code><\/li>
进入手机shell：adb shell<\/code><\/li>
获取root权限：su<\/code><\/li>
进入目标目录：cd \/data\/local\/tmp<\/code><\/li>
修改Frida server权限：chmod 755 frida-server-16.2.1-android-x86_64<\/code><\/li>
启动Frida server：.\/frida-server-16.2.1-android-x86_64<\/code><\/li>
端口转发： adb forward tcp:27042 tcp:27042 adb forward tcp:27043 tcp:27043 <\/code><\/pre> <\/li> 验证Frida是否正常工作：frida-ps -U<\/code> 或 frida-ps -R<\/code><\/li> <\/ol> 三、Frida基础用法<\/h2> 1. Hook普通方法<\/h3> 应用场景<\/strong>：监控或修改应用程序中某个方法的执行<\/p> 示例代码<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> MainActivity<\/span> =<\/span> Java<\/span>.use<\/span>("com.ad2001.frida0x1.MainActivity"<\/span>); <\/span><\/span> <\/span><\/span> MainActivity<\/span>.get_random<\/span>.implementation<\/span> =<\/span> function<\/span>() { <\/span><\/span> console<\/span>.log<\/span>("MainActivity.get_random is called"<\/span>); <\/span><\/span> var<\/span> ret_val<\/span> =<\/span> this<\/span>.get_random<\/span>(); <\/span><\/span> console<\/span>.log<\/span>("MainActivity.get_random result is "<\/span> +<\/span> ret_val<\/span>); <\/span><\/span> return<\/span> ret_val<\/span>; <\/span><\/span> }; <\/span><\/span>}); <\/span><\/span><\/code><\/pre>使用命令<\/strong>：<\/p> frida -U -f com.ad2001.frida0x1 -l test.js <\/code><\/pre> 模板<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> <<\/span>class_reference<\/span>><\/span> =<\/span> Java<\/span>.use<\/span>("<package_name>.<class>"<\/span>); <\/span><\/span> <<\/span>class_reference<\/span>><\/span>.<<\/span>method_to_hook<\/span>><\/span>.implementation<\/span> =<\/span> function<\/span>(<<\/span>args<\/span>><\/span>) { <\/span><\/span> \/* 自定义实现 *\/<\/span> <\/span><\/span> }; <\/span><\/span>}); <\/span><\/span><\/code><\/pre>2. Hook静态方法<\/h3> 应用场景<\/strong>：调用或修改静态方法<\/p> 示例代码<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> a<\/span> =<\/span> Java<\/span>.use<\/span>("com.ad2001.frida0x2.MainActivity"<\/span>); <\/span><\/span> a<\/span>.get_flag<\/span>(4919<\/span>); <\/span><\/span>}); <\/span><\/span><\/code><\/pre>使用命令<\/strong>：<\/p> frida -U 'Frida 0x2' -l Hook.js <\/code><\/pre> 模板<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> <<\/span>class_reference<\/span>><\/span> =<\/span> Java<\/span>.use<\/span>("<package_name>.<class>"<\/span>); <\/span><\/span> a<\/span>.function<\/span>(val<\/span>); \/\/ 需要调用的方法名称 <\/span><\/span><\/span><\/span>}); <\/span><\/span><\/code><\/pre>3. 更改变量的值<\/h3> 应用场景<\/strong>：直接修改类中的变量值<\/p> 示例代码<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> a<\/span> =<\/span> Java<\/span>.use<\/span>("com.ad2001.frida0x3.Checker"<\/span>); <\/span><\/span> a<\/span>.code<\/span>.value<\/span> =<\/span> 512<\/span>; <\/span><\/span>}); <\/span><\/span><\/code><\/pre>使用命令<\/strong>：<\/p> frida -U -f com.ad2001.frida0x3 -l hook.js <\/code><\/pre> 模板<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> <<\/span>class_reference<\/span>><\/span> =<\/span> Java<\/span>.use<\/span>("<package_name>.<class>"<\/span>); <\/span><\/span> <<\/span>class_reference<\/span>><\/span>.<<\/span>variable<\/span>><\/span>.value<\/span> =<\/span> <<\/span>value<\/span>><\/span>; \/\/需要修改的变量 <\/span><\/span><\/span><\/span>}); <\/span><\/span><\/code><\/pre>4. 创建类实例<\/h3> 应用场景<\/strong>：当需要调用非静态方法时，先创建类的实例<\/p> 示例代码<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> check<\/span> =<\/span> Java<\/span>.use<\/span>("com.ad2001.frida0x4.Check"<\/span>); <\/span><\/span> var<\/span> check_obj<\/span> =<\/span> check<\/span>.$new<\/span>(); <\/span><\/span> var<\/span> res<\/span> =<\/span> check_obj<\/span>.get_flag<\/span>(1337<\/span>); <\/span><\/span> console<\/span>.log<\/span>("FLAG:"<\/span> +<\/span> res<\/span>); <\/span><\/span>}); <\/span><\/span><\/code><\/pre>模板<\/strong>：<\/p> Java<\/span>.perform<\/span>(function<\/span>() { <\/span><\/span> var<\/span> <<\/span>class_reference<\/span>><\/span> =<\/span> Java<\/span>.use<\/span>("<package_name>.<class>"<\/span>); <\/span><\/span> var<\/span> <<\/span>class_instance<\/span>><\/span> =<\/span> <<\/span>class_reference<\/span>><\/span>.$new<\/span>(); \/\/ 创建类的实例 <\/span><\/span><\/span><\/span> <<\/span>class_instance<\/span>><\/span>.<<\/span>method<\/span>><\/span>(); \/\/ 调用该实例中的方法 <\/span><\/span><\/span><\/span>}); <\/span><\/span><\/code><\/pre>四、常见问题解决<\/h2> Frida无法连接<\/strong>：<\/p> 检查Frida server是否正常运行<\/li> 检查端口转发是否正确<\/li> 检查Frida和Frida server版本是否一致<\/li> <\/ul> <\/li> Hook不生效<\/strong>：<\/p> 检查目标类和方法名是否正确<\/li> 对于静态方法，可能需要先启动应用再附加<\/li> <\/ul> <\/li> 权限问题<\/strong>：<\/p> 确保设备已root<\/li> 检查Frida server文件权限<\/li> <\/ul> <\/li> <\/ol> 五、实战技巧<\/h2> 动态调试<\/strong>：结合jadx或JEB进行静态分析，再用Frida动态验证<\/p> <\/li> 多方法Hook<\/strong>：可以在一个脚本中Hook多个方法<\/p> <\/li> 参数修改<\/strong>：在implementation函数中可以修改传入参数或返回值<\/p> <\/li> 日志输出<\/strong>：使用console.log输出调试信息<\/p> <\/li> 异常处理<\/strong>：在脚本中加入try-catch块处理可能的异常<\/p> <\/li> <\/ol> 六、总结<\/h2> Frida是一款功能强大的动态分析工具，通过JavaScript脚本可以实现：<\/p> 方法Hook和修改<\/li> 静态方法调用<\/li> 变量值修改<\/li> 类实例创建和方法调用<\/li> <\/ul> 掌握这些基础用法后，可以进一步学习Frida的高级功能，如：<\/p> 内存操作<\/li> Native层Hook<\/li> RPC调用<\/li> 多线程处理等<\/li> <\/ul>

Frida基础用法教学文档<\/h1>

一、Frida简介<\/h2> Frida是一款强大的动态代码插桩工具，主要用于Android\/iOS\/macOS\/Linux\/Windows等平台的动态分析和逆向工程。它允许开发者通过JavaScript脚本来实时修改和监控目标应用程序的行为。<\/p>

二、环境准备<\/h2>

三、Frida基础用法<\/h2>

一、Frida简介<\/h2>
Frida是一款强大的动态代码插桩工具，主要用于Android\/iOS\/macOS\/Linux\/Windows等平台的动态分析和逆向工程。它允许开发者通过JavaScript脚本来实时修改和监控目标应用程序的行为。<\/p>