某格仔鋪軟件註冊碼算法的分析

昨天，有個朋友給了個軟件讓我看看，說他有個朋友在深圳開格仔鋪，想用這個軟件。我一直沒搞懂格仔鋪這種東西怎麼會有人去租呢，據說在日韓很流行，現在國內也有不少年輕人在玩。我想，可能這種模式正好填補了C2C實體店的空缺，看看現在如火如荼的淘寶也許就不難理解了。我家不遠就有一間，裝修得挺潮流的，改天有空去體驗一下。。。

該軟件是用於格仔鋪管理的，版本是最新的v7.4，分析如下：

首先用PEiD分析主程序GZPManager1.exe，顯示“ACProtect V2.0 -> risco *”殼，根據堆棧平衡原理很快找到OEP，然後用LordPE dump下來，再用ImportREC修復IAT，很容易就把該殼脫掉。然後，再用PEiD分析，顯示“Borland Delphi 6.0 - 7.0”，表示程序是用Delphi開發的。打開DeDe分析已經脫殼的GZPManager1.exe，我們可以輕鬆得到“軟件註冊”窗口“確定”按鈕的事件響應函數地址。接下來就可以用OllyDbg調試該函數了。該函數的結構很簡單，大概註冊碼檢驗過程如下：計算C1=F(F(機器碼))，F()是個算法，然後計算C2=F(輸入的註冊碼)，最後通過比較C1和C2來判斷輸入註冊碼是否有效。從上面原理可以清楚知道當輸入註冊碼等於F(機器碼)時，則C1==C2，校驗就通過，所以註冊機只要實現F()算法就可生成註冊碼。F()的代碼和分析如下：

 004DE4C4 /$ 55 push ebp 004DE4C5 |. 8BEC mov ebp, esp 004DE4C7 |. 83C4 F8 add esp, -8 004DE4CA |. 53 push ebx 004DE4CB |. 56 push esi 004DE4CC |. 894D F8 mov dword ptr [ebp-8], ecx 004DE4CF |. 8BDA mov ebx, edx ; ebx=12E4EA8, initialization constant, for further calculation 004DE4D1 |. 8945 FC mov dword ptr [ebp-4], eax 004DE4D4 |. 8B45 FC mov eax, dword ptr [ebp-4] 004DE4D7 |. E8 186AF2FF call 00404EF4 004DE4DC |. 33C0 xor eax, eax 004DE4DE |. 55 push ebp 004DE4DF |. 68 5AE54D00 push 004DE55A 004DE4E4 |. 64:FF30 push dword ptr fs:[eax] 004DE4E7 |. 64:8920 mov dword ptr fs:[eax], esp 004DE4EA |. 8B45 FC mov eax, dword ptr [ebp-4] ; [ebp-4] is input string 004DE4ED |. E8 1268F2FF call 00404D04 ; get input string len, return to eax 004DE4F2 |. 8BC8 mov ecx, eax 004DE4F4 |. 85C9 test ecx, ecx 004DE4F6 |. 7E 3B jle short 004DE533 ; len<=0 ,jmp 004DE4F8 |. BE 01000000 mov esi, 1 ; begin calculating SN using input string 004DE4FD |> 8B45 FC /mov eax, dword ptr [ebp-4] ; get base addreass of input string, start of calc loop 004DE500 |. 0FB64430 FF |movzx eax, byte ptr [eax+esi-1] ; get a char of input string 004DE505 |. 33D2 |xor edx, edx 004DE507 |. 52 |push edx 004DE508 |. 50 |push eax 004DE509 |. 8BC3 |mov eax, ebx 004DE50B |. 99 |cdq 004DE50C |. 330424 |xor eax, dword ptr [esp] ; xor char got before with ebp, initialization constant, or result of previous calculation 004DE50F |. 335424 04 |xor edx, dword ptr [esp+4] 004DE513 |. 83C4 08 |add esp, 8 ; balance stack 004DE516 |. 25 FF000000 |and eax, 0FF ; get the lowest byte 004DE51B |. 8B0485 24AC71>|mov eax, dword ptr [eax*4+71AC24] ; get data from table using eax as index 004DE522 |. C1EB 08 |shr ebx, 8 ; shift ebx by 8 004DE525 |. 81E3 FFFFFF00 |and ebx, 0FFFFFF ; get the 3 lower byte 004DE52B |. 33C3 |xor eax, ebx ; 004DE52D |. 8BD8 |mov ebx, eax 004DE52F |. 46 |inc esi 004DE530 |. 49 |dec ecx 004DE531 |.^ 75 CA /jnz short 004DE4FD ; end of calc loop, ebx is ouput 004DE533 |> 8B4D F8 mov ecx, dword ptr [ebp-8] 004DE536 |. 8BC3 mov eax, ebx 004DE538 |. F7D0 not eax ; SN in hex is ~eax 004DE53A |. BA 08000000 mov edx, 8 004DE53F |. E8 E4BCF2FF call 0040A228 ; transform SN from hex format to string format 004DE544 |. 33C0 xor eax, eax 004DE546 |. 5A pop edx 004DE547 |. 59 pop ecx 004DE548 |. 59 pop ecx 004DE549 |. 64:8910 mov dword ptr fs:[eax], edx 004DE54C |. 68 61E54D00 push 004DE561 004DE551 |> 8D45 FC lea eax, dword ptr [ebp-4] 004DE554 |. E8 DB64F2FF call 00404A34 004DE559 /. C3 retn 004DE55A .^ E9 555DF2FF jmp 004042B4 004DE55F .^ EB F0 jmp short 004DE551 004DE561 . 5E pop esi 004DE562 . 5B pop ebx 004DE563 . 59 pop ecx 004DE564 . 59 pop ecx 004DE565 . 5D pop ebp 004DE566 . C3 retn

註冊機部分代碼如下：

 //F()算法裏所要查的表，該表可在主程序文件裏找到，大小爲1024。使用HEX Workshop可以直接導出C格式 // Generated by BreakPoint Software's Hex Workshop v4.20 // http://www.hexworkshop.com // http://www.bpsoft.com // // Source File: GZPManager1_unpacked.exe // Time: 2009-1-14 9:53 // Orig. Offset: 3255332 / 0x00000000 // Length: 1024 / 0x00000400 (bytes) unsigned char rawData[1024] = { 0x00, 0x00, 0x00, 0x00, 0x96, 0x30, 0x07, 0x77, 0x2C, 0x61, 0x0E, 0xEE, 0xBA, 0x51, 0x09, 0x99, 0x19, 0xC4, 0x6D, 0x07, 0x8F, 0xF4, 0x6A, 0x70, 0x35, 0xA5, 0x63, 0xE9, 0xA3, 0x95, 0x64, 0x9E, 0x32, 0x88, 0xDB, 0x0E, 0xA4, 0xB8, 0xDC, 0x79, 0x1E, 0xE9, 0xD5, 0xE0, 0x88, 0xD9, 0xD2, 0x97, 0x2B, 0x4C, 0xB6, 0x09, 0xBD, 0x7C, 0xB1, 0x7E, 0x07, 0x2D, 0xB8, 0xE7, 0x91, 0x1D, 0xBF, 0x90, 0x64, 0x10, 0xB7, 0x1D, 0xF2, 0x20, 0xB0, 0x6A, 0x48, 0x71, 0xB9, 0xF3, 0xDE, 0x41, 0xBE, 0x84, 0x7D, 0xD4, 0xDA, 0x1A, 0xEB, 0xE4, 0xDD, 0x6D, 0x51, 0xB5, 0xD4, 0xF4, 0xC7, 0x85, 0xD3, 0x83, 0x56, 0x98, 0x6C, 0x13, 0xC0, 0xA8, 0x6B, 0x64, 0x7A, 0xF9, 0x62, 0xFD, 0xEC, 0xC9, 0x65, 0x8A, 0x4F, 0x5C, 0x01, 0x14, 0xD9, 0x6C, 0x06, 0x63, 0x63, 0x3D, 0x0F, 0xFA, 0xF5, 0x0D, 0x08, 0x8D, 0xC8, 0x20, 0x6E, 0x3B, 0x5E, 0x10, 0x69, 0x4C, 0xE4, 0x41, 0x60, 0xD5, 0x72, 0x71, 0x67, 0xA2, 0xD1, 0xE4, 0x03, 0x3C, 0x47, 0xD4, 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0x93, 0x06, 0xD7, 0xCD, 0x29, 0x57, 0xDE, 0x54, 0xBF, 0x67, 0xD9, 0x23, 0x2E, 0x7A, 0x66, 0xB3, 0xB8, 0x4A, 0x61, 0xC4, 0x02, 0x1B, 0x68, 0x5D, 0x94, 0x2B, 0x6F, 0x2A, 0x37, 0xBE, 0x0B, 0xB4, 0xA1, 0x8E, 0x0C, 0xC3, 0x1B, 0xDF, 0x05, 0x5A, 0x8D, 0xEF, 0x02, 0x2D, } ; //註冊機算法 void CGeZaiPu_KeyGenDlg::OnButtonGen() { char *pMC = NULL; char szSN[32]; int nSize = 0; unsigned long nMC = 0; unsigned long nVal = 0; unsigned long nPrevVal = 0x12e4ea8; UpdateData(); if(m_strMC.GetLength() <= 0) { MessageBox("Machine code must not be empty!","Error",MB_ICONERROR); return; } nSize = m_strMC.GetLength(); pMC = (char*)malloc(nSize); memcpy(pMC,m_strMC,nSize); for(int i = 0; i < nSize; i++) { nMC = (unsigned long)*(pMC + i); nMC ^= nPrevVal; nMC &= 0xff; nVal = *(unsigned long*)(rawData + nMC * 4); nPrevVal >>= 8; nPrevVal &= 0x0ffffff; nPrevVal ^=nVal; } nPrevVal = ~nPrevVal; sprintf(szSN,"%X",nPrevVal); m_strSN = szSN; UpdateData(FALSE); if(pMC) free(pMC); }