64 lines
3.0 KiB
Markdown
64 lines
3.0 KiB
Markdown
没加壳
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阅读作者的要求
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```
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1. Remove the NAG screen...
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2. Find a correct serial or create a keygen
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(NO PATCH) is to easy to patch... ]:)
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```
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开始：
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1. 在EP处可以看到我们需要去除的NAG弹窗
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```assembly
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004047A0 | 55 | push ebp |
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004047A1 | 8BEC | mov ebp,esp |
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004047A3 | 83C4 F0 | add esp,FFFFFFF0 |
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004047A6 | 53 | push ebx |
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004047A7 | B8 68474000 | mov eax,crackme#1.404768 |
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004047AC | E8 87EDFFFF | call crackme#1.403538 |
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004047B1 | 6A 00 | push 0 |
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004047B3 | E8 3CEEFFFF | call <JMP.&_GetModuleHandleAStub@4> |
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004047B8 | A3 00674000 | mov dword ptr ds:[406700],eax | 00406700:&"MZP"
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004047BD | 68 40000400 | push 40040 |
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004047C2 | 68 F8474000 | push crackme#1.4047F8 | 4047F8:"Nitroito - Crackme#1"
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004047C7 | 68 10484000 | push crackme#1.404810 | 404810:"Hello! welcome to my Crackme#1, as you can guess,\r\nthis is the NAG screen to remove... :]"
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004047CC | 6A 00 | push 0 |
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004047CE | E8 71EEFFFF | call <JMP.&_MessageBoxA@16> |
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004047D3 | 48 | dec eax |
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004047D4 | 75 13 | jne crackme#1.4047E9 |
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004047D6 | B9 0A000000 | mov ecx,A | 0A:'\n'
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004047DB | 33D2 | xor edx,edx |
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004047DD | A1 00674000 | mov eax,dword ptr ds:[406700] | 00406700:&"MZP"
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004047E2 | E8 BDFCFFFF | call crackme#1.4044A4 |
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004047E7 | 8BD8 | mov ebx,eax |
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004047E9 | 53 | push ebx |
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004047EA | E8 FDEDFFFF | call <JMP.&ExitProcess> |
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```
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2. Patch
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```assembly
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004047B8 | A3 00674000 | mov dword ptr ds:[406700],eax | 00406700:&"MZP"
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004047BD | EB 17... | jmp crackme#1.4047D6 | <--
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...
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004047D6 | B9 0A000000 | mov ecx,A | 0A:'\n'
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```
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3. 寻找注册方法，搜索字符串"Name must"
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摆烂，太复杂了，只研究出前两组的计算方式
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所以我打算找点新方法
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4. 直接改造成keygen
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检查keygen.exe与源程序的区别你应该可以看出我改了什么：
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```assembly
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004040D2 | E9 9E070000 | jmp keygen3.404875 |
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```
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(写的不咋地，code请至少填一位) |