solved new crackme?

This commit is contained in:
Chenx221 2024-09-26 23:17:22 +08:00
parent c7b02f95d3
commit 3173667ab8
Signed by: chenx221
GPG Key ID: D7A9EC07024C3021
13 changed files with 392 additions and 0 deletions

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wellcome to my 1st crackme
all you have to do is:
1. Remove the NAG screen...
2. Find a correct serial or create a keygen
(NO PATCH) is to easy to patch... ]:)
it is a litle bit hardcoded, if you have patience
for mathematics algoritms, it is your pleasure
see help on crackme for details...
for those guys who loves win32asm, this crackme was
pure coded in Borland Delphi v6, it is a good example
that it is possible to code small size progys with
those kind of programing languages :]
_______________________________
Nitroito - Nitroito@hotmail.com
26-02-2004

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

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// dllmain.cpp
#include "pch.h"
#include <Windows.h>
extern "C" __declspec(dllexport) void ShowDataAndCopy(const char* data) {
const size_t len = strlen(data) + 1;
HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, len);
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EmptyClipboard();
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#pragma once
#define WIN32_LEAN_AND_MEAN // 从 Windows 头文件中排除极少使用的内容
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#ifndef PCH_H
#define PCH_H
// 添加要在此处预编译的标头
#include "framework.h"
#endif //PCH_H

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