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challenge, where the protected program takes the volume serial number and the username and generates a challenge, which is just a long number. The user is then given that number and is supposed to call the software vendor and ask for a valid product key that will be generated based on the supplied number. In such cases, a keygen would simply convert the challenge to the product key. As its name implies, KeygenMe-3 was meant to be keygenned, so by patching it you were essentially cheating. Let s rectify the situation by creating a keygen for KeygenMe-3.
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Ripping Key-Generation Algorithms
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Ripping algorithms from copy protection products is often an easy and effective method for creating keygen programs. The idea is quite simple: Locate the function or functions within the protected program that calculate a valid serial number, and port them into your keygen. The beauty of this approach is that you just don t need to really understand the algorithm; you simply need to locate it and find a way to call it from your own program. The initial task you must perform is to locate the key-generation algorithm within the crackme. There are many ways to do this, but one the rarely fails is to look for the code that reads the contents of the two edit boxes into which you re typing the username and serial number. Assuming that KeygenMe-3 s main screen is a dialog box (and this can easily be verified by looking for one of the dialog box creation APIs in the program s initialization code), it is likely that the program would use GetDlgItemText or that it would send the edit box a WM_GETTEXT message. Working under the assumption that it s GetDlg ItemText you re after, you can go back to the Names window in OllyDbg and look for references to GetDlgItemTextA or GetDlgItemTextW. As expected, you will find that the program is calling GetDlgItemTextA, and in opening the Find References to Import window, you find two calls into the API (not counting the direct JMP, which is the import address table entry).
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004012B1 004012B3 004012B8 004012BA 004012BD 004012C2 004012C5 004012C7 004012C9 004012CE 004012D0 PUSH 40 PUSH Key4.0040303F PUSH 6A PUSH DWORD PTR [EBP+8] CALL <JMP.&USER32.GetDlgItemTextA> CMP EAX,0 JE SHORT Key4.004012DF PUSH 40 PUSH Key4.0040313F PUSH 6B PUSH DWORD PTR [EBP+8] ; ; ; ; ; Count = 40 (64.) Buffer = Key4.0040303F ControlID = 6A (106.) hWnd GetDlgItemTextA
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; ; ; ;
Count = 40 (64.) Buffer = Key4.0040313F ControlID = 6B (107.) hWnd
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Listing 11.1 Conversion algorithm for first input field in KeygenMe-3. (continued)
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004012D3 004012D8 004012DB 004012DD 004012DF 004012E1 004012E6
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CALL <JMP.&USER32.GetDlgItemTextA> CMP EAX,0 JE SHORT Key4.004012DF JMP SHORT Key4.004012F6 PUSH 0 PUSH Key4.0040348C PUSH Key4.00403000
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; GetDlgItemTextA
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004012EB 004012ED 004012F2 004012F3 004012F6 004012FB 00401300 00401302 00401304 00401306 0040130B 00401311 00401318 0040131A 0040131D 0040131F 00401321 00401327 00401329 0040132B 00401330 00401331 00401333 00401334 00401339 0040133E 0040133F
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PUSH 0 CALL <JMP.&USER32.MessageBoxA> LEAVE RET 10 PUSH Key4.0040303F CALL <JMP.&KERNEL32.lstrlenA> XOR ESI,ESI XOR EBX,EBX MOV ECX,EAX MOV EAX,1 MOV EBX,DWORD PTR [40303F] MOVSX EDX,BYTE PTR [EAX+40351F] SUB EBX,EDX IMUL EBX,EDX MOV ESI,EBX SUB EBX,EAX ADD EBX,4353543 ADD ESI,EBX XOR ESI,EDX MOV EAX,4 DEC ECX JNZ SHORT Key4.0040130B PUSH ESI PUSH Key4.0040313F CALL Key4.00401388 POP ESI CMP EAX,ESI
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; Style = MB_OK|MB_APPLMODAL ; Title = KeygenMe #3 ; Text = Please Fill In 1 Char to Continue!! ; hOwner = NULL ; MessageBoxA
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Listing 11.1 (continued)
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Before attempting to rip the conversion algorithm from the preceding code, let s also take a look at the function at Key4.00401388, which is apparently a part of the algorithm.
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00401388 00401389 0040138B PUSH EBP MOV EBP,ESP PUSH DWORD PTR [EBP+8]
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Listing 11.2 Conversion algorithm for second input field in KeygenMe-3.
Breaking Protections
0040138E 00401393 00401394 00401396 00401398 0040139B 0040139C 0040139E 0040139F 004013A2 004013A3 004013A5 004013A8 004013AA 004013AC 004013AD 004013AF 004013B1 004013B2 004013B3
CALL <JMP.&KERNEL32.lstrlenA> PUSH EBX XOR EBX,EBX MOV ECX,EAX MOV ESI,DWORD PTR [EBP+8] PUSH ECX XOR EAX,EAX LODS BYTE PTR [ESI] SUB EAX,30 DEC ECX JE SHORT Key4.004013AA IMUL EAX,EAX,0A LOOPD SHORT Key4.004013A5 ADD EBX,EAX POP ECX LOOPD SHORT Key4.0040139B MOV EAX,EBX POP EBX LEAVE RET 4