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安卓逆向系列 02:jadx 实战——反混淆与代码阅读技巧

  • 2026-07-29 09:38:34
安卓逆向系列 02:jadx 实战——反混淆与代码阅读技巧

静态分析是逆向的基础。jadx 把乱码般的 DEX 变回人能读懂的 Java,但真正的挑战是从一堆 a.b.c() 里找到你想要的逻辑。



一、jadx 是什么?

jadx 是目前最好用的开源 Android 反编译工具,能将 DEX/APK 直接还原为可读的 Java 代码,并自动完成以下工作:

  • DEX → Java 源码(不需要中间步骤)

  • 还原控制流(if/for/switch)

  • 内联匿名类

  • 资源文件解析(strings.xml/layout)

与 dex2jar + JD-GUI 的区别:

维度jadxdex2jar + JD-GUI
还原质量更高,直接从 DEX 分析较低,经过中间格式转换
处理混淆内置反混淆支持基本无
搜索功能全局文本搜索
活跃维护✅ 持续更新❌ 基本停更

二、安装与启动

# 方式一:下载 Release 包(推荐)# https://github.com/skylot/jadx/releases# 下载 jadx-X.X.X.zip,解压即用# 启动 GUI./bin/jadx-gui# 命令行反编译./bin/jadx -d output/ target.apk# 只输出 Java 源码(不含资源)./bin/jadx -d output/ --no-res target.apk

三、基本操作

导入 APK

  1. 打开 jadx-gui → File → Open files

  2. 选择 .apk / .dex / .aab 文件

  3. 等待分析完成(大 APK 需要 1-2 分钟)

全局搜索(最常用)

快捷键功能
Ctrl+F在当前文件中搜索
Ctrl+Shift+F全局文本搜索(最常用)
Ctrl+N按类名搜索
Alt+F7查找所有引用
Ctrl+G跳转到行号
F5刷新反编译结果

四、代码混淆原理

ProGuard / R8 混淆器做的事情:

原始类名:UserLoginHelper   →  混淆后:a原始方法:checkPassword     →  混淆后:a原始字段:encryptionKey     →  混淆后:b

混淆后的代码特征:

  • 类名、方法名、字段名全为单字母或无意义短名

  • 字符串常量可能被加密

  • 调用链被打散,难以追踪


五、反混淆实战技巧

技巧一:字符串搜索(命中率最高)

从抓包中找到关键字符串,在 jadx 中全局搜索:

Ctrl+Shift+F 搜索:"sign"       → 找签名相关代码"encrypt"    → 找加密函数"token"      → 找 token 生成"Authorization" → 找请求头处理"/api/login" → 找登录接口

技巧二:引用追踪

找到字符串常量后,右键 → Find Usage,追踪到调用它的方法:

// 搜索到 "AES/CBC/PKCS5Padding"// → 右键 Find Usage// → 定位到 EncryptUtil.encrypt() 方法// → 继续追踪该方法的调用者// → 找到登录签名生成逻辑

技巧三:从 AndroidManifest 入手

jadx 会解析 AndroidManifest.xml,从这里可以找到:

  • 所有 Activity 入口

  • 自定义 Application 类(通常包含初始化逻辑)

  • 权限声明(推断功能)

技巧四:重命名注释

jadx 支持直接在 GUI 中重命名:

  • 右键类/方法/字段 → Rename(N键)

  • 重命名会同步到所有引用处

  • 配合注释逐步还原逻辑

// 重命名前publicStringa(StringbStringc) {returna.a(bc"k3y");}// 重命名后(边读边改)publicStringgenerateSign(StringdataStringtimestamp) {returnHmacUtils.hmacSha256(datatimestamp"k3y");}

技巧五:搜索 Android API 特征

不同功能有固定的 Android API 调用,直接搜 API 名:

目标搜索关键词
网络请求OkHttpClient / Retrofit / HttpURLConnection
加密MessageDigest / SecretKeySpec / Cipher
存储SharedPreferences / SQLiteDatabase
设备标识getDeviceId / Settings.Secure

六、读懂 smali 基础

有时 Java 反编译结果不完整,需要看 smali(Android 字节码的文本表示):

# smali 对照 Java.method public encrypt(Ljava/lang/String;)Ljava/lang/String;# → public String encrypt(String)invoke-virtual {v0, v1}, Lcom/app/Util;->doEncrypt(Ljava/lang/String;)Ljava/lang/String;# → v0.doEncrypt(v1)const-string v2, "secret_key"# → String v2 = "secret_key"move-result-object v3# → v3 = 上一条指令的返回值

七、实战:定位登录签名函数

步骤一: Burp 抓包,发现请求体中有 sign 字段

步骤二: jadx 全局搜索 "sign",找到赋值位置:

params.put("sign"SignUtil.generate(bodytimestamp));

步骤三: 点击 SignUtil,进入类查看 generate 方法:

publicstaticStringgenerate(Stringbodylongts) {Stringraw=body+ts+"SECRET_2024";returnmd5(raw).toUpperCase();}

步骤四: 重命名相关类和方法,理清完整调用链。

步骤五: 用 Python 复现:

importhashlibdefgenerate_sign(bodystrtsint->str:raw = f"{body}{ts}SECRET_2024"returnhashlib.md5(raw.encode()).hexdigest().upper()

八、常用快捷键速查

快捷键功能
Ctrl+Shift+F全局文本搜索
Alt+F7查找所有引用
Ctrl+B跳转到声明
N重命名
Ctrl+Z撤销重命名
Ctrl+E最近打开文件
Ctrl+W关闭当前标签
Ctrl+P查看方法参数

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  1. CONNECT:[ UseTime:0.000420s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000585s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000341s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000445s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000480s ]
  6. SELECT * FROM `set` [ RunTime:0.003461s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000591s ]
  8. SELECT * FROM `article` WHERE `id` = 486094 LIMIT 1 [ RunTime:0.010519s ]
  9. UPDATE `article` SET `lasttime` = 1785379619 WHERE `id` = 486094 [ RunTime:0.013204s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.007030s ]
  11. SELECT * FROM `article` WHERE `id` < 486094 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000520s ]
  12. SELECT * FROM `article` WHERE `id` > 486094 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000461s ]
  13. SELECT * FROM `article` WHERE `id` < 486094 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000556s ]
  14. SELECT * FROM `article` WHERE `id` < 486094 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000638s ]
  15. SELECT * FROM `article` WHERE `id` < 486094 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002810s ]
0.109771s