一個有趣的CM
系統 ： Windows xphtml
程序 ： Crackme#3 - Self Destructed算法
程序下載地址 ：http://pan.baidu.com/s/1kVxwlaZ
shell
要求 ： 註冊機編寫 sass
使用工具 ： ODapp
可在「PEDIY CrackMe 2007」中查找關於此程序的討論，標題爲「適合新手的D4ph1_-_Crackme#3的破解」。框架
利用超級字符串插件看下程序內的文本：函數
Ultra String Reference Address Disassembly Text String 00401000 mov esi, dword ptr [esp] (initial cpu selection) 00401068 push 0040313A kernel32.dll 00401229 push 00403147 \eraser.bat 00401255 push 00403147 \eraser.bat 0040125C push 00403153 :loop\n\ndel "%s"\n\nif exist "%s" goto loop\n\ndel "%s"
00401289 push 00403000 crackme#3 by d4ph1 0040128E push 00403186 debugger found...i think im gonna kill myself!:( 004012A0 push 00403147 \eraser.bat 00401346 push 00403000 crackme#3 by d4ph1 0040134B push 00403013 *======== your target is to create a valid keygenerator.contact : fistiks16@hotmail.com ========* 004014AB push 00403000 crackme#3 by d4ph1 004014B0 push 004030E0 great work!hope this is coming from your keygenerator!:) 004014C0 push 00403000 crackme#3 by d4ph1 004014C5 push 00403119 this is not the right serial... 004014D5 push 00403000 crackme#3 by d4ph1 004014DA push 004030BB you have to write a serial first...! 004014F3 push 00403000 crackme#3 by d4ph1 004014F8 push 00403098 you have to write a name first...! 00401508 push 00403000 crackme#3 by d4ph1 0040150D push 00403075 the name you write is not correct!
好像檢索出了什麼不得了的內容，雙擊debugger found...i think im gonna kill myself!:( 查看引用位置：工具
004011F3 /$ 68 D1314000 push 004031D1 ; /isdebuggerpresent
004011F8 |. FF35 F0344000 push dword ptr [4034F0] ; |hModule = NULL
004011FE |. E8 8B030000 call <jmp.&kernel32.GetProcAddress> ; \GetProcAddress
00401203 |. FFD0 call eax 00401205 |. 0BC0 or eax, eax 00401207 |. 75 0C jnz short 00401215
00401209 |. 8A1D 07124000 mov bl, byte ptr [401207] 0040120F |. 80FB 75 cmp bl, 75
00401212 |. 75 03 jnz short 00401217
00401214 |. C3 retn
00401215 |> EB 00 jmp short 00401217
00401217 |> 6A 00 push 0 ; /hTemplateFile = NULL
00401219 |. 68 80000000 push 80 ; |Attributes = NORMAL
0040121E |. 6A 02 push 2 ; |Mode = CREATE_ALWAYS
00401220 |. 6A 00 push 0 ; |pSecurity = NULL
00401222 |. 6A 00 push 0 ; |ShareMode = 0
00401224 |. 68 00000040 push 40000000 ; |Access = GENERIC_WRITE
00401229 |. 68 47314000 push 00403147 ; |\eraser.bat
0040122E |. E8 37030000 call <jmp.&kernel32.CreateFileA> ; \CreateFileA
00401233 |. 8BD8 mov ebx, eax 00401235 |. 8D35 0A394000 lea esi, dword ptr [40390A] 0040123B |. 68 04010000 push 104 ; /BufSize = 104 (260.)
00401240 |. 56 push esi ; |PathBuffer => Crackme#.0040390A
00401241 |. 6A 00 push 0 ; |hModule = NULL
00401243 |. E8 3A030000 call <jmp.&kernel32.GetModuleFileName>; \GetModuleFileNameA
00401248 |. 56 push esi ; /pDest => Crackme#.0040390A
00401249 |. 56 push esi ; |pSrc => ""
0040124A |. E8 E5020000 call <jmp.&user32.CharToOemA> ; \CharToOemA
0040124F |. 8D3D 0A354000 lea edi, dword ptr [40350A] 00401255 |. 68 47314000 push 00403147 ; /\eraser.bat
0040125A |. 56 push esi ; |<%s> => ""
0040125B |. 56 push esi ; |<%s> => ""
0040125C |. 68 53314000 push 00403153 ; |:loop\n\ndel "%s"\n\nif exist "%s" goto loop\n\ndel "%s"
00401261 |. 57 push edi ; |s => Crackme#.0040350A
00401262 |. E8 C7020000 call <jmp.&user32.wsprintfA> ; \wsprintfA
00401267 |. 83C4 14 add esp, 14
0040126A |. 57 push edi ; /String
0040126B |. E8 3C030000 call <jmp.&kernel32.lstrlenA> ; \lstrlenA
00401270 |. 8D15 0E3A4000 lea edx, dword ptr [403A0E] 00401276 |. 6A 00 push 0 ; /pOverlapped = NULL
00401278 |. 52 push edx ; |pBytesWritten => Crackme#.00403A0E
00401279 |. 50 push eax ; |nBytesToWrite
0040127A |. 57 push edi ; |Buffer
0040127B |. 53 push ebx ; |hFile
0040127C |. E8 25030000 call <jmp.&kernel32.WriteFile> ; \WriteFile
00401281 |. 53 push ebx ; /hObject
00401282 |. E8 DD020000 call <jmp.&kernel32.CloseHandle> ; \CloseHandle
00401287 |. 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
00401289 |. 68 00304000 push 00403000 ; |crackme#3 by d4ph1
0040128E |. 68 86314000 push 00403186 ; |debugger found...i think im gonna kill myself!:(
00401293 |. 6A 00 push 0 ; |hOwner = NULL
00401295 |. E8 B2020000 call <jmp.&user32.MessageBoxA> ; \MessageBoxA
0040129A |. 6A 00 push 0 ; /IsShown = 0
0040129C |. 6A 00 push 0 ; |DefDir = NULL
0040129E |. 6A 00 push 0 ; |Parameters = NULL
004012A0 |. 68 47314000 push 00403147 ; |\eraser.bat
004012A5 |. 6A 00 push 0 ; |Operation = NULL
004012A7 |. 6A 00 push 0 ; |hWnd = NULL
004012A9 |. E8 04030000 call <jmp.&shell32.ShellExecuteA> ; \ShellExecuteA
004012AE |. 6A 00 push 0 ; /ExitCode = 0
004012B0 \. E8 BB020000 call <jmp.&kernel32.ExitProcess> ; \ExitProcess
程序啓動時利用WINAPI 查看是否被調試，若是被調試則建立批處理文件：oop
:LOOP DEL "D:\IT\逆向工程\CrackMe\crackme3selfdestructed\Crackme#3 - Self Destructed.exe" IF EXIST "D:\IT\逆向工程\CrackMe\crackme3selfdestructed\Crackme#3 - Self Destructed.exe" GOTO LOOP DEL "\ERASER.BAT"
啓動批處理開始循環刪除以後，退出程序。批處理刪除源程序以後，再刪除自身。頗有想法的一個反調試機制。this
再來看看算法部分：
00401366 |. 68 EC314000 push 004031EC ; /123
0040136B |. 68 80000000 push 80 ; |wParam = 80
00401370 |. 6A 0D push 0D ; |Message = WM_GETTEXT
00401372 |. 68 EA030000 push 3EA ; |ControlID = 3EA (1002.)
00401377 |. FF75 08 push dword ptr [ebp+8] ; |hWnd
0040137A |. E8 D9010000 call <jmp.&user32.SendDlgItemMessageA>; \SendDlgItemMessageA
0040137F |. A3 6C324000 mov dword ptr [40326C], eax 00401384 |. 83F8 04 cmp eax, 4 ; 長度低於等於4？
00401387 |. 0F86 60010000 jbe 004014ED ; 是則報錯
0040138D |. 83F8 14 cmp eax, 14 ; 長度高於等於14？
00401390 |. 0F83 57010000 jnb 004014ED ; 是則報錯
00401396 |. 68 70324000 push 00403270 ; /lParam = 403270
0040139B |. 68 00010000 push 100 ; |wParam = 100
004013A0 |. 6A 0D push 0D ; |Message = WM_GETTEXT
004013A2 |. 68 EB030000 push 3EB ; |ControlID = 3EB (1003.)
004013A7 |. FF75 08 push dword ptr [ebp+8] ; |hWnd
004013AA |. E8 A9010000 call <jmp.&user32.SendDlgItemMessageA>; \SendDlgItemMessageA
004013AF |. 83F8 00 cmp eax, 0 ; 長度爲0則報錯
004013B2 |. 0F84 1B010000 je 004014D3
004013B8 |. 33C9 xor ecx, ecx ; 開始初始化
004013BA |. 49 dec ecx 004013BB |. 33D2 xor edx, edx 004013BD |. 4A dec edx 004013BE |. 33F6 xor esi, esi 004013C0 |. 4E dec esi 004013C1 |. 33C0 xor eax, eax 004013C3 |. A1 6C324000 mov eax, dword ptr [40326C] ; 載入用戶名長度
004013C8 |. 48 dec eax 004013C9 |. 50 push eax 004013CA |> 46 /inc esi 004013CB |. 41 |inc ecx 004013CC |. 0FBE81 F03440>|movsx eax, byte ptr [ecx+4034F0] ; 遍歷一個特定字符串
004013D3 |. 0FBE9E EC3140>|movsx ebx, byte ptr [esi+4031EC] ; 遍歷用戶名字符串
004013DA |. 83F0 12 |xor eax, 12
004013DD |. 83C0 34 |add eax, 34
004013E0 |. C1E3 03 |shl ebx, 3
004013E3 |. 83EB 20 |sub ebx, 20
004013E6 |. 83F3 66 |xor ebx, 66
004013E9 |. 32C3 |xor al, bl 004013EB |. 03C3 |add eax, ebx 004013ED |. E8 5CFDFFFF |call 0040114E ; 根據eax的值算出一個對應的值，並保存
004013F2 |. 58 |pop eax 004013F3 |. 3BF0 |cmp esi, eax ; 是否已經遍歷結束？
004013F5 |. 50 |push eax 004013F6 |. 74 0A |je short 00401402
004013F8 |. 83F9 03 |cmp ecx, 3 ; 第4次循環的時候，重置ecx爲-1
004013FB |. 75 03 |jnz short 00401400
004013FD |. 33C9 |xor ecx, ecx 004013FF |. 49 |dec ecx 00401400 |>^ EB C8 \jmp short 004013CA
00401402 |> 58 pop eax 00401403 |. 42 inc edx 00401404 |. C682 70334000>mov byte ptr [edx+403370], 2D ; 添加連字符-
0040140B |. 33C9 xor ecx, ecx 0040140D |. 49 dec ecx 0040140E |. BB 13000000 mov ebx, 13
00401413 |. 33C0 xor eax, eax 00401415 |> 41 /inc ecx 00401416 |. 0FBEB1 F43440>|movsx esi, byte ptr [ecx+4034F4] ; 遍歷一個特定字符串
0040141D |. 0FBEBB B73140>|movsx edi, byte ptr [ebx+4031B7] ; 遍歷一個特定字符串
00401424 |. 2BFE |sub edi, esi 00401426 |. 03C7 |add eax, edi 00401428 |. 2BC6 |sub eax, esi 0040142A |. C1E0 04 |shl eax, 4
0040142D |. 83F9 01 |cmp ecx, 1 ; 循環兩次了？
00401430 |.^ 75 E3 \jnz short 00401415
00401432 |. C1E8 04 shr eax, 4
00401435 |. 33C9 xor ecx, ecx 00401437 |. 49 dec ecx 00401438 |> 41 /inc ecx 00401439 |. E8 10FDFFFF |call 0040114E ; 根據eax的值算出一個對應的值，並保存
0040143E |. 8AC4 |mov al, ah 00401440 |. 83F9 01 |cmp ecx, 1 ; 循環兩次了？
00401443 |.^ 75 F3 \jnz short 00401438
00401445 |. 42 inc edx 00401446 |. C682 70334000>mov byte ptr [edx+403370], 2D ; 添加連字符-
0040144D |. 33C9 xor ecx, ecx 0040144F |. 49 dec ecx 00401450 |. 33FF xor edi, edi 00401452 |. 0FBE35 063540>movsx esi, byte ptr [403506] 00401459 |> 41 /inc ecx 0040145A |. 0FBE81 F63440>|movsx eax, byte ptr [ecx+4034F6] ; 遍歷一個特定字符串
00401461 |. 8B9F 07124000 |mov ebx, dword ptr [edi+401207] ; 遍歷一個代碼區段
00401467 |. 33C3 |xor eax, ebx 00401469 |. 331D 06354000 |xor ebx, dword ptr [403506] 0040146F |. 2BD8 |sub ebx, eax 00401471 |. 2B1D 06354000 |sub ebx, dword ptr [403506] 00401477 |. 03C3 |add eax, ebx 00401479 |. E8 D0FCFFFF |call 0040114E ; 根據eax的值算出一個對應的值，並保存
0040147E |. 83C7 04 |add edi, 4
00401481 |. 4E |dec esi ; 循環結束？
00401482 |.^ 75 D5 \jnz short 00401459
00401484 |. 68 70334000 push 00403370 ; /String = ""
00401489 |. E8 1E010000 call <jmp.&kernel32.lstrlenA> ; \lstrlenA
0040148E |. 8BC8 mov ecx, eax 00401490 |. 41 inc ecx 00401491 |> 49 /dec ecx ; 密碼和序列號是否一致？
00401492 |. 0FBE81 703240>|movsx eax, byte ptr [ecx+403270] 00401499 |. 0FBE99 703340>|movsx ebx, byte ptr [ecx+403370] 004014A0 |. 3BC3 |cmp eax, ebx 004014A2 |. 75 1A |jnz short 004014BE
004014A4 |. 83F9 00 |cmp ecx, 0
004014A7 |.^ 75 E8 \jnz short 00401491
004014A9 |. 6A 00 push 0 ; /Style = MB_OK|MB_APPLMODAL
004014AB |. 68 00304000 push 00403000 ; |crackme#3 by d4ph1
004014B0 |. 68 E0304000 push 004030E0 ; |great work!hope this is coming from your keygenerator!:)
004014B5 |. 6A 00 push 0 ; |hOwner = NULL
004014B7 |. E8 90000000 call <jmp.&user32.MessageBoxA> ; \MessageBoxA
004014BC |. EB 28 jmp short 004014E6
004014BE |> 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
004014C0 |. 68 00304000 push 00403000 ; |crackme#3 by d4ph1
004014C5 |. 68 19314000 push 00403119 ; |this is not the right serial...
004014CA |. 6A 00 push 0 ; |hOwner = NULL
004014CC |. E8 7B000000 call <jmp.&user32.MessageBoxA> ; \MessageBoxA
004014D1 |. EB 13 jmp short 004014E6
004014D3 |> 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
004014D5 |. 68 00304000 push 00403000 ; |crackme#3 by d4ph1
004014DA |. 68 BB304000 push 004030BB ; |you have to write a serial first...!
004014DF |. 6A 00 push 0 ; |hOwner = NULL
004014E1 |. E8 66000000 call <jmp.&user32.MessageBoxA> ; \MessageBoxA
004014E6 |> E8 93FCFFFF call 0040117E
004014EB |. EB 2C jmp short 00401519
004014ED |> 0BC0 or eax, eax 004014EF |. 75 15 jnz short 00401506
004014F1 |. 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
004014F3 |. 68 00304000 push 00403000 ; |crackme#3 by d4ph1
004014F8 |. 68 98304000 push 00403098 ; |you have to write a name first...!
004014FD |. 6A 00 push 0 ; |hOwner = NULL
004014FF |. E8 48000000 call <jmp.&user32.MessageBoxA> ; \MessageBoxA
00401504 |. EB 13 jmp short 00401519
00401506 |> 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
00401508 |. 68 00304000 push 00403000 ; |crackme#3 by d4ph1
0040150D |. 68 75304000 push 00403075 ; |the name you write is not correct!
00401512 |. 6A 00 push 0 ; |hOwner = NULL
00401514 |. E8 33000000 call <jmp.&user32.MessageBoxA> ; \MessageBoxA
00401519 |> EB 09 jmp short 00401524
0040151B |> B8 00000000 mov eax, 0
00401520 |. C9 leave
00401521 |. C2 1000 retn 10
00401524 |> B8 01000000 mov eax, 1
00401529 |. C9 leave
0040152A \. C2 1000 retn 10
中間的子程序：
0040114E /$ 66:50 push ax 00401150 |. C0E8 04 shr al, 4
00401153 |. 24 0F and al, 0F
00401155 |. 04 30 add al, 30
00401157 |. 3C 39 cmp al, 39
00401159 |. 7E 02 jle short 0040115D
0040115B |. 04 07 add al, 7
0040115D |> 42 inc edx 0040115E |. 8882 70334000 mov byte ptr [edx+403370], al 00401164 |. 66:58 pop ax 00401166 |. C0E0 04 shl al, 4
00401169 |. C0E8 04 shr al, 4
0040116C |. 24 0F and al, 0F
0040116E |. 04 30 add al, 30
00401170 |. 3C 39 cmp al, 39
00401172 |. 7E 02 jle short 00401176
00401174 |. 04 07 add al, 7
00401176 |> 42 inc edx 00401177 |. 8882 70334000 mov byte ptr [edx+403370], al 0040117D \. C3 retn
總體算法不困難，就是稍微有點複雜，有點耐心就能夠搞定啦。
打開http://www.cnblogs.com/ZRBYYXDM/p/5115596.html中搭建的框架，新增類函數以下：
void CKengen_TemplateDlg::CreateStr(CString &str, DWORD num) { BYTE Temp = 0; __asm{ push eax mov eax,num shr al,4 and al,0x0F add al,0x30 cmp al,0x39 jle NotAdd add al,7 NotAdd: mov Temp,al pop eax } str += (char)Temp; __asm{ push eax mov eax,num shl al,4 shr al,4 and al,0x0F add al,0x30 cmp al,0x39 jle NotAdd2 add al,7 NotAdd2:mov Temp,al pop eax } str += (char)Temp; return ; }
再將OnBtnDecrypt函數編輯以下：
void CKengen_TemplateDlg::OnBtnDecrypt() { // TODO: Add your control notification handler code here
CString str; GetDlgItemText( IDC_EDIT_NAME,str ); //獲取用戶名字串基本信息。
int len = str.GetLength(); if ( len > 4 && len < 14 ){ //格式控制。
char CharArr[] = { 0x58,0x50,0x80,0x7C,0x05,0x01 }; char ComputerName[] = { 0x32,0x30,0x31,0x36,0x30,0x34,0x30,0x35,0x2D,0x32,0x30,0x30,0x37,0x00 }; DWORD CodeSegment[] = { 0x1D8A0C75, 0x00401207, 0x7575FB80, 0x00EBC303, 0x8068006A, 0x6A000000, 0x6A006A02, 0x00006800, 0x47684000, 0xE8004031, 0x00000337, 0x358DD88B, 0x0040390A, 0x00010468, 0x006A5600, 0x00033AE8, }; CString Serial = ""; int i = 0,j = 0 ; for ( ; i != str.GetLength() ; i++,j++ ){ DWORD Char = CharArr[j]; DWORD Temp = str.GetAt( i ); DWORD Res = 0; Char = ( Char^0x12 ) + 0x34; Temp = ( ((Temp<<3) - 0x20) ^ 0x66 ); __asm{ push eax push ebx mov eax,Char mov ebx,Temp xor al,bl add eax,ebx mov Res,eax pop eax pop ebx } CreateStr( Serial,Res ); if ( j == 3 ) j = -1; } Serial += "-"; CreateStr( Serial,0x536 ); CreateStr( Serial,0x505 ); Serial += "-"; for ( i = 0 ; i != 0x0D ; i++ ){ DWORD EAX = ( ComputerName[i] ^ CodeSegment[i] ); DWORD EBX = ( CodeSegment[i] ^ 0x0D ) - EAX - 0x0D; DWORD Res = EAX + EBX; CreateStr( Serial,Res ); } SetDlgItemText( IDC_EDIT_PASSWORD,Serial ); } else MessageBox( "用戶名格式錯誤！" ); }
再在OnInitDialog中添加此代碼修改標題：SetWindowText(_T("CRACKME_Keygen"));
運行效果：
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