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【破解声明】：本人只是对Crack感兴趣，没有其它目的,本破文仅供研究使用,请不要参照本破文进行D版。
【破解工具】：TRW2000
—————————————————————————————
【过 程】：
下断:bpx hmemcpy
很容易到如下代码:
0167:006172F2 8BF0 MOV ESI,EAX
0167:006172F4 8D55F4 LEA EDX,[EBP-0C]
0167:006172F7 8B8348030000 MOV EAX,[EBX+0348]
0167:006172FD E83E93E6FF CALL 00480640
0167:00617302 8B45F4 MOV EAX,[EBP-0C]
0167:00617305 50 PUSH EAX
0167:00617306 8D45F0 LEA EAX,[EBP-10]
0167:00617309 E8BA5FEFFF CALL 0050D2C8
0167:0061730E 8B45F0 MOV EAX,[EBP-10] EAX=机器码
0167:00617311 E81AFFFFFF CALL 00617230 这个CALL里面的运算和下面CALL2的一样
0167:00617316 B90A000000 MOV ECX,0A ECX=10(0xA)
0167:0061731B 33D2 XOR EDX,EDX
0167:0061731D F7F1 DIV ECX 除ECX
0167:0061731F 8BCA MOV ECX,EDX 余数放到
0167:00617321 8BD6 MOV EDX,ESI
0167:00617323 58 POP EAX
0167:00617324 E85734EFFF CALL 0050A780 //关键CALL1
0167:00617329 84C0 TEST AL,AL
0167:0061732B 7468 JZ 00617395
0167:0061732D 8D55EC LEA EDX,[EBP-14]
-------------------//关键CALL1//-------------------
..略一部分..
0167:0050A95C 8D45C4 LEA EAX,[EBP-3C]
0167:0050A95F E864290000 CALL 0050D2C8
0167:0050A964 8B4DC4 MOV ECX,[EBP-3C]
0167:0050A967 8D45C8 LEA EAX,[EBP-38]
0167:0050A96A 8B55FC MOV EDX,[EBP-04]
0167:0050A96D E81EA0EFFF CALL 00404990 连接用户名和机器码和余数
0167:0050A972 8B45C8 MOV EAX,[EBP-38] 字串"jxtour"&"673-0-0-387F9FF"&"余数"
0167:0050A975 E8E2F8FFFF CALL 0050A25C //关键CALL2
0167:0050A97A 3BD8 CMP EBX,EAX
0167:0050A97C 7404 JZ 0050A982 注册码不对就完了!
0167:0050A97E 33C0 XOR EAX,EAX
0167:0050A980 EB02 JMP SHORT 0050A984
0167:0050A982 B001 MOV AL,01
0167:0050A984 8BD8 MOV EBX,EAX
0167:0050A986 E9B0000000 JMP 0050AA3B
0167:0050A98B 85DB TEST EBX,EBX
..略一部分..
-------------------//关键CALL2//-------------------
0167:0050A25C 55 PUSH EBP
0167:0050A25D 8BEC MOV EBP,ESP
0167:0050A25F 51 PUSH ECX
0167:0050A260 53 PUSH EBX
0167:0050A261 8945FC MOV [EBP-04],EAX
0167:0050A264 8B45FC MOV EAX,[EBP-04]
0167:0050A267 E8C8A8EFFF CALL 00404B34
0167:0050A26C 33C0 XOR EAX,EAX
0167:0050A26E 55 PUSH EBP
0167:0050A26F 68CBA25000 PUSH DWORD 0050A2CB
0167:0050A274 64FF30 PUSH DWORD [FS:EAX]
0167:0050A277 648920 MOV [FS:EAX],ESP
0167:0050A27A 8B45FC MOV EAX,[EBP-04]
0167:0050A27D E8C2A6EFFF CALL 00404944
0167:0050A282 33D2 XOR EDX,EDX EDX设为0
0167:0050A284 8BC8 MOV ECX,EAX
0167:0050A286 85C9 TEST ECX,ECX
0167:0050A288 7629 JNA 0050A2B3
0167:0050A28A B801000000 MOV EAX,01
0167:0050A28F 8D1492 LEA EDX,[EDX+EDX*4] //EDX开始为0
0167:0050A292 8D1492 LEA EDX,[EDX+EDX*4]
0167:0050A295 8B5DFC MOV EBX,[EBP-04] //取字串"jxtour673-0-0-387F9FF"
0167:0050A298 0FB65C03FF MOVZX EBX,BYTE [EBX+EAX-01] //逐位取ascii码
0167:0050A29D 03D3 ADD EDX,EBX //加到edx
0167:0050A29F 8B5DFC MOV EBX,[EBP-04] //取字串"jxtour673-0-0-387F9FF"
0167:0050A2A2 0FB65C03FF MOVZX EBX,BYTE [EBX+EAX-01] //逐位取ascii码
0167:0050A2A7 6BDB0D IMUL EBX,EBX,BYTE +0D ebx=ebx*0xD
0167:0050A2AA C1E314 SHL EBX,14 ebx=ebx*2^14
0167:0050A2AD 33D3 XOR EDX,EBX edx=edx xor ebx
0167:0050A2AF 40 INC EAX 计数器加一
0167:0050A2B0 49 DEC ECX 长度减一
0167:0050A2B1 75DC JNZ 0050A28F 没完跳回循环
0167:0050A2B3 8BDA MOV EBX,EDX 计算结果到EBX,?ebx就是真注册码!
0167:0050A2B5 33C0 XOR EAX,EAX
0167:0050A2B7 5A POP EDX
0167:0050A2B8 59 POP ECX
0167:0050A2B9 59 POP ECX
0167:0050A2BA 648910 MOV [FS:EAX],EDX
0167:0050A2BD 68D2A25000 PUSH DWORD 0050A2D2
0167:0050A2C2 8D45FC LEA EAX,[EBP-04]
0167:0050A2C5 E8BAA3EFFF CALL 00404684
算法注册机代码略! |
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