小甲鱼 OllyDbg 教程系列 (六) ：PJ 软件功能限制（不修改jnz的非爆破方法）

￡神魔★判官ぃ 2023-06-12 11:30 40阅读 0赞

小甲鱼视频地址：[https://www.bilibili.com/video/av6889190?p=13][https_www.bilibili.com_video_av6889190_p_13]

小甲鱼OD学习第9讲：[https://www.bbsmax.com/A/x9J23xEM56/][https_www.bbsmax.com_A_x9J23xEM56]

程序下载地址：[https://pan.baidu.com/s/1JTQ32xIBV6XiPtuXsOIgiw][https_pan.baidu.com_s_1JTQ32xIBV6XiPtuXsOIgiw] 提取码: r5t4

这次我们的任务是 pj 去掉注册软件的限制，如下图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70][]

当我们输入账号密码的时候，它会提示输入的账号密码是无效的，如下图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 1][]

我们把程序载入OD，然后在查找字符串那里输入提示的无效账号密码的字符串，如下图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 2][]

然后下断点

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 3][]

然后运行程序，然后点击注册按钮，我们来到了如下图所示的地方，经过观察，我们可以发现，这个软件是否成功注册取决于地址4299B5 的代码test al,al

于是我们在这行代码的前一个call MrBills.0040714C下断点，如下图所示

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 4][]

再次运行程序，点击注册按钮，然后在断点  004299AD处进入程序内部，程序内部如下图所示，

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 5][]

这个时候，我们重点关注有寄存器AL的地方，然后经过观察，我们发现了 地址为00407011  mov al.bl

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 6][]

然后我们尝试把这行代码改为 mov al,1，  看看有什么效果

修改，然后保存

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 7][]

然后打开程序，发现已经去除限制成功！！！说明猜想是正确的！

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70 8][]

[https_www.bilibili.com_video_av6889190_p_13]: https://www.bilibili.com/video/av6889190?p=13
[https_www.bbsmax.com_A_x9J23xEM56]: https://www.bbsmax.com/A/x9J23xEM56/
[https_pan.baidu.com_s_1JTQ32xIBV6XiPtuXsOIgiw]: https://pan.baidu.com/s/1JTQ32xIBV6XiPtuXsOIgiw
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191113003454591.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 1]: https://img-blog.csdnimg.cn/20191113003524398.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ZyZWVraW5nMTAx,size_16,color_FFFFFF,t_70
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