某PE修改软件破解案例分析
第一步算出它的注册码！
:004D29F1 8D4000 lea eax, dword ptr [eax+00]
:004D29F4 55 push ebp
:004D29F5 8BEC mov ebp, esp
:004D29F7 83C4BC add esp, FFFFFFBC
:004D29FA 53 push ebx
:004D29FB 56 push esi
:004D29FC 33D2 xor edx, edx
:004D29FE 8955BC mov dword ptr [ebp-44], edx
:004D2A01 8955E8 mov dword ptr [ebp-18], edx
:004D2A04 8955E4 mov dword ptr [ebp-1C], edx
:004D2A07 8945EC mov dword ptr [ebp-14], eax
:004D2A0A 33C0 xor eax, eax
:004D2A0C 55 push ebp
:004D2A0D 68812C4D00 push 004D2C81
:004D2A12 64FF30 push dword ptr fs:[eax]
:004D2A15 648920 mov dword ptr fs:[eax], esp
:004D2A18 8D45C3 lea eax, dword ptr [ebp-3D]
:004D2A1B B165 mov cl, 65
:004D2A1D BA21000000 mov edx, 00000021
:004D2A22 E86500F3FF call 00402A8C
:004D2A27 33C0 xor eax, eax
:004D2A29 8945F8 mov dword ptr [ebp-08], eax
:004D2A2C 33C0 xor eax, eax
:004D2A2E 8945F4 mov dword ptr [ebp-0C], eax
:004D2A31 8D45C3 lea eax, dword ptr [ebp-3D]
:004D2A34 8B159CF94E00 mov edx, dword ptr [004EF99C]
:004D2A3A E8A14CF3FF call 004076E0
:004D2A3F 8D45C3 lea eax, dword ptr [ebp-3D]
:004D2A42 8945FC mov dword ptr [ebp-04], eax
:004D2A45 60 pushad
:004D2A46 8B7DFC mov edi, dword ptr [ebp-04]
:004D2A49 B818E41736 mov eax, 3617E418
:004D2A4E 3107 xor dword ptr [edi], eax
:004D2A50 B82EFC35A9 mov eax, A935FC2E
:004D2A55 314704 xor dword ptr [edi+04], eax
:004D2A58 B8B972D857 mov eax, 57D872B9
:004D2A5D 314708 xor dword ptr [edi+08], eax
:004D2A60 B837B43D49 mov eax, 493DB437
:004D2A65 31470C xor dword ptr [edi+0C], eax
:004D2A68 8B07 mov eax, dword ptr [edi]
:004D2A6A 334704 xor eax, dword ptr [edi+04]
:004D2A6D 8B5F08 mov ebx, dword ptr [edi+08]
:004D2A70 335F0C xor ebx, dword ptr [edi+0C]
:004D2A73 8945F8 mov dword ptr [ebp-08], eax
:004D2A76 895DF4 mov dword ptr [ebp-0C], ebx
:004D2A79 61 popad
:004D2A7A A1A0F94E00 mov eax, dword ptr [004EF9A0]
:004D2A7F E85C11F3FF call 00403BE0
:004D2A84 83F810 cmp eax, 00000010《——比较注册码是否是16位
:004D2A87 0F8CD1010000 jl 004D2C5E
:004D2A8D 8D45E8 lea eax, dword ptr [ebp-18]
:004D2A90 50 push eax
:004D2A91 B908000000 mov ecx, 00000008
:004D2A96 BA01000000 mov edx, 00000001
:004D2A9B A1A0F94E00 mov eax, dword ptr [004EF9A0]
:004D2AA0 E83F13F3FF call 00403DE4
:004D2AA5 8D45E4 lea eax, dword ptr [ebp-1C]
:004D2AA8 50 push eax
:004D2AA9 B908000000 mov ecx, 00000008
:004D2AAE BA09000000 mov edx, 00000009
:004D2AB3 A1A0F94E00 mov eax, dword ptr [004EF9A0]
:004D2AB8 E82713F3FF call 00403DE4
:004D2ABD 8D4DBC lea ecx, dword ptr [ebp-44]
:004D2AC0 BA08000000 mov edx, 00000008
:004D2AC5 8B45F8 mov eax, dword ptr [ebp-08]
:004D2AC8 E8DB45F3FF call 004070A8
:004D2ACD 8B55BC mov edx, dword ptr [ebp-44]
:004D2AD0 8B45E8 mov eax, dword ptr [ebp-18]前8位的真假注册码
:004D2AD3 E81812F3FF call 00403CF0《—比较前八位注册码
:004D2AD8 0F8560010000 jne 004D2C3E=>跳就OVER
:004D2ADE 8D4DBC lea ecx, dword ptr [ebp-44]
:004D2AE1 BA08000000 mov edx, 00000008
:004D2AE6 8B45F4 mov eax, dword ptr [ebp-0C]
:004D2AE9 E8BA45F3FF call 004070A8
:004D2AEE 8B55BC mov edx, dword ptr [ebp-44]
:004D2AF1 8B45E4 mov eax, dword ptr [ebp-1C]后8位的真假注册码
:004D2AF4 E8F711F3FF call 00403CF0《—比较后八位注册码
:004D2AF9 0F853F010000 jne 004D2C3E=>跳就OVER
:004D2AFF B88CF94E00 mov eax, 004EF98C
:004D2B04 8B159CF94E00 mov edx, dword ptr [004EF99C]
:004D2B0A E8A90EF3FF call 004039B8
:004D2B0F B890F94E00 mov eax, 004EF990
:004D2B14 8B4DE4 mov ecx, dword ptr [ebp-1C]
:004D2B17 8B55E8 mov edx, dword ptr [ebp-18]
:004D2B1A E80D11F3FF call 00403C2C
:004D2B1F B201 mov dl, 01
* Possible StringData Ref from Code Obj ->”“A淍LA訞孉
MmrSra媡@”
|
:004D2B21 A1D0C94000 mov eax, dword ptr [0040C9D0]
:004D2B26 E86502F3FF call 00402D90
:004D2B2B 8BD8 mov ebx, eax
:004D2B2D 8BC3 mov eax, ebx
:004D2B2F E860D4F3FF call 0040FF94
:004D2B34 BA00020000 mov edx, 00000200
:004D2B39 8BC3 mov eax, ebx
:004D2B3B 8B08 mov ecx, dword ptr [eax]
:004D2B3D FF11 call dword ptr [ecx]
:004D2B3F 33C9 xor ecx, ecx
:004D2B41 33D2 xor edx, edx
:004D2B43 8BC3 mov eax, ebx
:004D2B45 8B30 mov esi, dword ptr [eax]
:004D2B47 FF560C call [esi+0C]
:004D2B4A BE08000000 mov esi, 00000008
:004D2B4F 8D55C3 lea edx, dword ptr [ebp-3D]
:004D2B52 B920000000 mov ecx, 00000020
:004D2B57 8BC3 mov eax, ebx
:004D2B59 E88ED0F3FF call 0040FBEC
:004D2B5E 8D55F8 lea edx, dword ptr [ebp-08]
:004D2B61 B904000000 mov ecx, 00000004
:004D2B66 8BC3 mov eax, ebx
:004D2B68 E87FD0F3FF call 0040FBEC
:004D2B6D 8D55F4 lea edx, dword ptr [ebp-0C]
:004D2B70 B904000000 mov ecx, 00000004
我的注册码是dalao/9B2B793D1EE5C68E
第二步去掉时间限制！
这个软件很奇怪！当你输入正确的注册码后将在PE EXPLORER的目录中生成一pexdata.rdat文件但是还是有时间限制！我猜这个软件的注册有两方面一个是注册码一个是网上注册然后把注册标志写到某个地方！才能完全注册去掉时间限制！不过不要紧下面中只要改半个字节即可去掉时间限制！嘿嘿!
==============================================================================
* Possible StringData Ref from Code Obj ->”12345678FEDCBA98″
|
:004D33A0 8B15A8F94E00 mov edx, dword ptr [004EF9A8]
:004D33A6 E80D06F3FF call 004039B8
:004D33AB 8B45F0 mov eax, dword ptr [ebp-10]
:004D33AE 80782401 cmp byte ptr [eax+24], 01
:004D33B2 7508 jne 004D33BC
:004D33B4 8B45F0 mov eax, dword ptr [ebp-10]
:004D33B7 E838F6FFFF call 004D29F4
:004D33BC E8AFDAFFFF call 004D0E70
:004D33C1 8B45F0 mov eax, dword ptr [ebp-10]====》注意这个！
:004D33CB 0F85DA070000 jne 004D3BAB =======〉不调就是试用版
:004D33D1 8B45F0 mov eax, dword ptr [ebp-10]
:004D33D4 8B9834020000 mov ebx, dword ptr [eax+00000234]
:004D33DA 83C305 add ebx, 00000005
===============================================================================
一般改法只要改掉这句004D33CB 0F85DA070000 jne 004D3BAB
把（0F85DA070000改成0F84DA070000）即可！
现在咱们要提升一个档次！我讲讲高级的改法！嘿嘿！
大家注意[eax+00000254]这个内存地址！找出和这个注册标志相关的程序！
|:004D33C4 80B85402000000 cmp byte ptr [eax+00000254], 00
用BPM 下断点！以下就是核心程序
:004D3169 89836C020000 mov dword ptr [ebx+0000026C], eax
:004D316F 8B8364020000 mov eax, dword ptr [ebx+00000264]
:004D3175 3B45F0 cmp eax, dword ptr [ebp-10]
:004D3178 751A jne 004D3194 ===》跳就是注册版
:004D317A 8B8368020000 mov eax, dword ptr [ebx+00000268]
:004D3180 3B45EC cmp eax, dword ptr [ebp-14]
:004D3183 750F jne 004D3194 ===》跳就是注册版
:004D3185 8B836C020000 mov eax, dword ptr [ebx+0000026C]
:004D318B 3B45E8 cmp eax, dword ptr [ebp-18]
:004D318E 7504 jne 004D3194 ===》跳就是注册版
:004D3190 33C0 xor eax, eax
:004D3192 EB02 jmp 004D3196 ===〉到这你就OVER
:004D3194 B001 mov al, 01
:004D3196 888354020000 mov byte ptr [ebx+00000254], al
:004D319C 8B45F4 mov eax, dword ptr [ebp-0C]
:004D319F 50 push eax
:004D31A0 B85C0D4D00 mov eax, 004D0D5C
:004D31A5 668B0D9C624F00 mov cx, word ptr [004F629C]
:004D31AC 8B150CFA4E00 mov edx, dword ptr [004EFA0C]
:004D31B2 E8C1DCFFFF call 004D0E78
:004D31B7 33C0 xor eax, eax
:004D31B9 5A pop edx
:004D31BA 59 pop ecx
:004D31BB 59 pop ecx
大家现在明白了吧嘿嘿！高级改法吧004D3178地址的（750F改成EB0F)
收工有啥错误的地方请大家多提批评！
