小甲鱼 OllyDbg 教程系列 (五) ：破解 PC Surgeon 之查找字符串

偏执的太偏执、 2023-05-30 14:59 8阅读 0赞

[https://www.bilibili.com/video/av6889190/?p=11][https_www.bilibili.com_video_av6889190_p_11]

[https://www.bilibili.com/video/av6889190/?p=12][https_www.bilibili.com_video_av6889190_p_12]

程序下载地址：[https://pan.baidu.com/s/1eVTLQ\_AatLrmrz3FLwM5ww][https_pan.baidu.com_s_1eVTLQ_AatLrmrz3FLwM5ww]    提取码：wny9

修复 OllyDBG  右键 -> 复制到可执行文件 -> 所有修改  中 所有修改不显示的问题

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70][]

修复不显示 “ 所有修改 ”：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 1][]

修复后：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 2][]

# 开始逆向分析 #

切入点：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 3][]

查找字符串：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 4][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 5][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 6][]

下断点：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 7][]

函数入口处下断点：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 8][]

重新载入程序，断点到相应位置，然后让跳转实现：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 9][]

跳转实现后，程序跳过开始的窗口，显示主窗口，说明需要修改的位置就在断点位置的附近：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 10][]

about 窗口：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 11][]

在根据 about 窗口中的 <Unregistered Version> 作为字符串进行搜索：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 12][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 13][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 14][]

字符串对应位置下断点

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 15][]

所在函数开始位置也下个断点（ 55 位置，即 push ebp ）：

![20191112004116634.png][]

重新载入程序，点击 about 窗口，触发断点，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 16][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 17][]

然后 按 F9 ，运行程序：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 18][]

暴力破解，打补丁。重新载入程序，在 条件跳转的地方，都用 jmp  无条件跳转

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 19][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 20][]

保存程序：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 21][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 22][]

保存文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 23][]

验证：

重新载入修改后的程序，按 F9 运行程序，发现已经是想要的效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 24][]

# 比较高级的方法 #

[https://www.bilibili.com/video/av6889190?p=12][https_www.bilibili.com_video_av6889190_p_12 1]

上面是比较低级的方法。。。当然有比较高级的方法。  
重新将软件载入OD。来到代码处。鼠标向上滑几行，可以看到这样的代码：  
mov eax,dword ptr \[60ebe8\]  
cmp byte ptr \[eax\],0  
jnz 005cc935  
显然，将地址60ebe8的值送到eax里，然后将eax的值作为地址，将这个地址中的值和0比较（其实是两数相减），结果不为零就跳转，但是，，，，  
ds:\[0060eb8c\]=00610c4a  
右键点击mov eax,dword ptr \[60ebe8\] 这一行 —> **右键** —> **查找参考** —> **地址常量**，将所有的都设置断点：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 25][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 26][]

重新运行程序，来到第一个断点处，有这样的代码：  
mov edx,dword ptr \[60ebe8\]  
mov byte ptr \[edx\],al  
在上面我们知道ds:\[0060eb8c\]=00610c4a，所以：  
mov edx,dword ptr \[60ebe8\]  
mov byte ptr \[edx\],al  
这两段代码执行后，ds:\[00610c4a\]的值就是al的值，不幸的是，我们从OD右边的寄存器中看到al=0，所以  
ds:\[00610c4a\]=00，所以cmp byte ptr \[eax\],0的结果就是0，所以jnz 005cc935就不能跳转，所以。。。  
我们直接将mov byte ptr \[edx\],al 改为  
mov byte ptr \[edx\],1，复制到可执行文件，保存文件就破解成功了，牛逼吧，但是这样改会出现这样的问题：

![20191112012527412.png][]

这个软件这样改是没有问题，但比较大的软件这样改，就可能会影响程序，因为要重定位的东西太多了（至于什么是重定位，这个很重要，提醒一下自己，有兴趣的可以去看看PE结构），所以也可以这样改：  
将后面的 cmp byte ptr \[eax\],0改为 mov byte ptr \[eax\],1  
将jnz short 005c2c15 改为jmp short 005c2c15  
这样就不会出现重定位 的代码过多的问题。

[https_www.bilibili.com_video_av6889190_p_11]: https://www.bilibili.com/video/av6889190/?p=11
[https_www.bilibili.com_video_av6889190_p_12]: https://www.bilibili.com/video/av6889190/?p=12
[https_pan.baidu.com_s_1eVTLQ_AatLrmrz3FLwM5ww]: https://pan.baidu.com/s/1eVTLQ_AatLrmrz3FLwM5ww
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191111235000257.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191111235859159.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20191112001045943.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20191112000733119.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20191112001321392.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 7]: https://img-blog.csdnimg.cn/20191112001747731.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 8]: https://img-blog.csdnimg.cn/20191112001808121.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 9]: https://img-blog.csdnimg.cn/20191112002126279.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 10]: https://img-blog.csdnimg.cn/20191112002535673.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 11]: https://img-blog.csdnimg.cn/20191112002854905.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 12]: https://img-blog.csdnimg.cn/20191112003138515.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 13]: https://img-blog.csdnimg.cn/20191112003415298.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 14]: https://img-blog.csdnimg.cn/20191112003640984.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 15]: https://img-blog.csdnimg.cn/20191112003930161.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[20191112004116634.png]: https://img-blog.csdnimg.cn/20191112004116634.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 16]: https://img-blog.csdnimg.cn/20191112004416367.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 17]: https://img-blog.csdnimg.cn/20191112004847991.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 18]: https://img-blog.csdnimg.cn/20191112005021134.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 19]: https://img-blog.csdnimg.cn/2019111200544049.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
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[https_www.bilibili.com_video_av6889190_p_12 1]: https://www.bilibili.com/video/av6889190?p=12
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[20191112012527412.png]: https://img-blog.csdnimg.cn/20191112012527412.png