usb加密狗完美破解【分析】

bek · 发表于 2011-3-8 12:07:26


	一款商业管理系统用了USB狗验证不插入USB功能受到限制！查壳：无壳 Borland Delphi 6.0 - 7.0 OD载入 F9运行弹出：未检测到软件狗，试用版软件部分功能将受到限制！ F12暂停 ------------------------------------------------------------------------------------- 7C92E514 > C3 retn ; (初始 cpu 选择) 7C92E515 . 8DA424 000000>lea esp,dword ptr ss:[esp] 7C92E51C . 8D6424 00 lea esp,dword ptr ss:[esp] 7C92E520 >/$ 8D5424 08 lea edx,dword ptr ss:[esp+8] 7C92E524 \|. CD 2E int 2E 7C92E526 \. C3 retn 7C92E527 90 nop 7C92E528 >/$ 55 push ebp 7C92E529 \|. 8BEC mov ebp,esp -------------------------------------------------------------------------------------- ALT+K调用堆栈调用堆栈 0012FD34 77D50877 ? user32.MessageBoxTimeoutA user32.77D50872 0012FD30 0012FD54 77D5082F ? user32.MessageBoxExA user32.77D5082A 0012FD50 0012FD58 00000000 hOwner = NULL 0012FD5C 0063B9E0 Text = "未检测到软件狗，试用版软件 0012FD60 004E0040 Title = "提示" 0012FD64 00002040 Style = MB_OK\|MB_ICONASTERISK\|MB_T 0012FD68 00000000 LanguageID = 0 (LANG_NEUTRAL) 0012FD70 004E000A ? <jmp.&user32.MessageBoxA> Washgl.004E0005 0012FD6C 0012FD74 00000000 hOwner = NULL 0012FD78 0063B9E0 Text = "未检测到软件狗，试用版软件 0012FD7C 004E0040 Title = "提示" 0012FD80 00002040 Style = MB_OK\|MB_ICONASTERISK\|MB_T 0012FD8C 0063B7DC ? Washgl.004DFFE4 Washgl.0063B7D7 在这句双击进去 ---------------------------------------------------------------------------------------------- 0063B79D . 55 push ebp 0063B79E . 68 FFB86300 push Washgl.0063B8FF 0063B7A3 . 64:FF32 push dword ptr fs:[edx] 0063B7A6 . 64:8922 mov dword ptr fs:[edx],esp 0063B7A9 . E8 0235EBFF call Washgl.004EECB0 0063B7AE . A2 00416400 mov byte ptr ds:[644100],al 0063B7B3 . A1 EC496400 mov eax,dword ptr ds:[6449EC] 0063B7B8 . 8A15 00416400 mov dl,byte ptr ds:[644100] 0063B7BE . 8810 mov byte ptr ds:[eax],dl 0063B7C0 . A0 00416400 mov al,byte ptr ds:[644100] 0063B7C5 . 34 01 xor al,1 0063B7C7 . 84C0 test al,al 0063B7C9 . 84C0 test al,al 0063B7CB 74 5F je short Washgl.0063B82C 整个调用只有这一个能跳过所以改成jmp顺利跳过去了 0063B7CD . B8 E0B96300 mov eax,Washgl.0063B9E0 0063B7D2 . BA 01000000 mov edx,1 0063B7D7 . E8 0848EAFF call Washgl.004DFFE4 双击进去在这，这就是关键CLL了 0063B7DC . 8D55 F4 lea edx,dword ptr ss:[ebp-C] 0063B7DF . A1 2C656400 mov eax,dword ptr ds:[64652C] 0063B7E4 . E8 5F89E1FF call Washgl.00454148 0063B7E9 . 8D45 F4 lea eax,dword ptr ss:[ebp-C] 0063B7EC . BA 18BA6300 mov edx,Washgl.0063BA18 0063B7F1 . E8 FE93DCFF call Washgl.00404BF4 0063B7F6 . 8B55 F4 mov edx,dword ptr ss:[ebp-C] 0063B7F9 . A1 2C656400 mov eax,dword ptr ds:[64652C] 0063B7FE . E8 7589E1FF call Washgl.00454178 0063B803 . A1 08476400 mov eax,dword ptr ds:[644708] 0063B808 . E8 2791DCFF call Washgl.00404934 0063B80D . A1 04476400 mov eax,dword ptr ds:[644704] 0063B812 . E8 1D91DCFF call Washgl.00404934 0063B817 . 8B45 FC mov eax,dword ptr ss:[ebp-4] 0063B81A . 8B80 FC020000 mov eax,dword ptr ds:[eax+2FC] 0063B820 . 33D2 xor edx,edx 0063B822 . E8 19A9E2FF call Washgl.00466140 0063B827 . E9 C5000000 jmp Washgl.0063B8F1 --------------------------------------------------------------------------------------------------- 再次尝试进入软件此时无提示进入软件而且，窗体上的（试用版已经没了）点关于：还是试用版功能依然限制！此时重新载入OD，查找字符串！（对于Borland Delphi这招很好用）超级字串参考＋地址反汇编文本字串 0051FE24 mov edx,Washgl.0051FEA0 退出 0051FE30 mov eax,Washgl.0051FEA8 非法用户，系统将关闭！ 0051FE41 mov eax,Washgl.0051FEC0 非法用户，重新登录失败！ 0051FE61 mov eax,Washgl.0051FEDC 口令无效，请重新输入！ 005206EB mov edx,Washgl.00520774 试用版 005206FA mov edx,Washgl.00520784 注册版 00520712 push Washgl.00520794 v 0052071E push Washgl.005207A0 ----------------------------------------------------------------------------------------------- 在试用版那双击进入！ 005206CC \|. 55 push ebp 005206CD \|. 68 5E075200 push Washgl.0052075E 005206D2 \|. 64:FF30 push dword ptr fs:[eax] 005206D5 \|. 64:8920 mov dword ptr fs:[eax],esp 005206D8 \|. 8BC3 mov eax,ebx 005206DA \|. E8 E5000000 call Washgl.005207C4 005206DF \|. E8 CCE5FCFF call Washgl.004EECB0 005206E4 \|. 84C0 test al,al 比较 005206E6 \|. 75 0F jnz short Washgl.005206F7 关键跳！jnz改jmp 直接跳到注册版 005206E8 \|. 8D45 FC lea eax,[local.1] 005206EB \|. BA 74075200 mov edx,Washgl.00520774 ; 试用版 005206F0 \|. E8 D742EEFF call Washgl.004049CC 005206F5 \|. EB 0D jmp short Washgl.00520704 005206F7 \|> 8D45 FC lea eax,[local.1] 005206FA \|. BA 84075200 mov edx,Washgl.00520784 ; 注册版 005206FF \|. E8 C842EEFF call Washgl.004049CC 00520704 \|> 8B55 FC mov edx,[local.1] 00520707 \|. 8B83 00030000 mov eax,dword ptr ds:[ebx+300] 0052070D \|. E8 663AF3FF call Washgl.00454178 00520712 \|. 68 94075200 push Washgl.00520794 ; 00520717 \|. A1 B8416400 mov eax,dword ptr ds:[6441B8] 0052071C \|. FF30 push dword ptr ds:[eax] 0052071E \|. 68 A0075200 push Washgl.005207A0 ; 00520723 \|. 68 AC075200 push Washgl.005207AC ; 版权所有(c) -------------------------------------------------------------------------------------------------------- 复制代码总结：到此已经破解成功，保存运行已经是注册版，功能限制已经取消了