安卓逆向_19（一） --- APK保护策略【APP打开就崩溃之霸哥apk过签名校验】

系统管理员 2023-02-17 12:29 17阅读 0赞

From：霸哥磁力搜索apk 过签名校验：[https://www.cnblogs.com/LuLuLuHao/p/12863978.html][https_www.cnblogs.com_LuLuLuHao_p_12863978.html]

霸哥磁力搜索app回编签名：[https://www.ssfiction.com/archives/2293][https_www.ssfiction.com_archives_2293]    [https://www.cnblogs.com/LuLuLuHao][https_www.cnblogs.com_LuLuLuHao]

哔哩哔哩（ IDA 分析 so ，函数参数分析 ）：[https://www.bilibili.com/video/BV1UE411A7rW?p=62][https_www.bilibili.com_video_BV1UE411A7rW_p_62]

1. 打开AndroidKiller  将“霸哥磁力搜索”进行反编译

![20200614102202186.png][]

2.放进模拟器发现

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70][]

出现这种情况有可能就是出现了签名校验，或者改错位置了。。。

一打开就出现崩溃，说明**签名校验** 在**入口点** 或者 **入口页面****。OnCreate 方法**

3.打开 “ddms” 查看报错原因

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 1][]

没发现什么可疑信息

4.发现 apk 在打开主界面前就崩了 用 jadx-jui 看看 apk 的 oncreate() 方法，查找线索

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 2][]

点进去查看

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 3][]

发现一大堆   不管它了 直接把方法注释掉看看

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 4][]

5.先搜索关键点   再注释掉   回编译看看效果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 5][]

现在能进去了    但界面看起来怪怪的（说明qian()这个方法还是有效果的）再接着往下看

6. 看到run()方法   run不就是运行吗？ 运行不起来八成是它搞的鬼   看到有个bug()方法很可疑

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 6][]

7.不管了  先把它注释掉  再说

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 7][]

8.发现越改越糟糕了

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 8][]

9.重新来

发现 bug 被 native 修饰  直接看 So

![20200614102808164.png][]

发现方法 getSignHashCode() 特别扎眼 点进去看一下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 9][]

10. 一看杂乱无章 自己给他转换一下

（导入jni.h头文件 推测 getSignHashCode()方法参数  不被static修饰：env，obj；被static：env，class;）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 10][]

签名三兄弟：**getPackageManager**、**getPackageInfo、getPackageName、（ singnatures ）**

11.一目了然  48行 这个exit（0）特别扎眼 直接把它nop掉试试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 11][]

*nop 掉*

但是我们直接用 ida nop 是没用的   得要使用一个工具 “winhex”

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 12][]

12.然后保存  替换

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 13][]

13.完美

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 14][]

[https_www.cnblogs.com_LuLuLuHao_p_12863978.html]: https://www.cnblogs.com/LuLuLuHao/p/12863978.html
[https_www.ssfiction.com_archives_2293]: https://www.ssfiction.com/archives/2293
[https_www.cnblogs.com_LuLuLuHao]: https://www.cnblogs.com/LuLuLuHao
[https_www.bilibili.com_video_BV1UE411A7rW_p_62]: https://www.bilibili.com/video/BV1UE411A7rW?p=62
[20200614102202186.png]: https://img-blog.csdnimg.cn/20200614102202186.png
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