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That s more like it, now you can see exactly which functions are used by the program, and reversing it is going to be a more straightforward task. Keep in mind that in some cases automatically unpacking the program is not going to be possible, and we would have to confront the packed program. This subject is discussed in depth in Part III of this book. For now let s start by running the program and trying to determine what it does. Needless to say, this should only be done in a controlled environment, on an isolated system that doesn t contain any valuable data or programs. There s no telling what this program is liable to do.

Figure 17.18 Results from Monte Carlo simulation of settlement problem with 1000 total points and strati ed sampling. p = simulation, pep = point-estimate, pfo = FOSM.

When launching the Webcam Shots.scr file, the first thing you ll notice is that nothing happens. That s the way it should be this program does not want to present itself to the end user in any way. It was made to be invisible. If the program s authors wanted the program to be even more convincing and effective, they could have embedded an actual image file into this executable, and immediately extract and show it when the program is first launched. This way the user would never suspect that anything was wrong because the image would be properly displayed. By not doing anything when the user clicks on

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this file the program might be exposing itself, but then again the typical victims of these kinds of programs are usually nontechnical users that aren t sure exactly what to expect from the computer at any given moment in time. They d probably think that the reason the image didn t appear was their own fault. The first actual change that takes place after the program is launched is that the original executable is gone from the directory where it was launched! The task list in Task Manager (or any other process list viewer) seems to contain a new and unidentified process called ZoneLockup.exe. (The machine I was running this on was a freshly installed, clean Windows 2000 system with almost no additional programs installed, so it was easy to detect the newly created process.) The file s name is clearly designed to fool na ve users into thinking that this process is some kind of a security component. If we launch a more powerful process viewer such as the Sysinternals Process Explorer (available from www.sysinternals.com), you can examine the full path of the ZoneLockup.exe process. It looks like the program has placed itself in the SYSTEM32 directory of the currently running OS (in my case this was C:\WINNT\SYSTEM32).

Finally, the Latin hypercube method gave the results in Figure 17.19, for 1000 points. The procedure described above for strati ed sampling was applied to each variable, only using 1000 points instead of 10. The orders of the values were then randomized to give 1000 points in a Latin hypercube. The results are somewhat better than those for a comparable number of points in direct simulation. The number of simulations required to achieve a desired level of accuracy is less than that required by direct Monte Carlo simulation, but not by an order of magnitude.

Let s take a quick look at the code that executes when we initially run this program, because it is the closest thing this program has to an installation program. This code is presented in Listing 8.3.

still get done. (This means that in a single-handed boat you de nitely need to be able to do everything!) If at all possible, allow more time than you think is required. In a regatta situation it can be easy to become distracted, or it may be harder to get the items you need. Good boat work may not win regattas, but bad work can certainly stop you winning.

17.5 Summary

00402621 00402622 00402624 0040262A 0040262B 0040262C 0040262D 0040262F 00402634 00402639 0040263B 00402640 00402645 0040264A 0040264F 00402654 00402659 0040265E 00402661 00402667 PUSH EBP MOV EBP,ESP SUB ESP,42C PUSH EBX PUSH ESI PUSH EDI XOR ESI,ESI PUSH 104 ; BufSize = 104 (260.) PUSH ZoneLock.00404540 ; PathBuffer = ZoneLock.00404540 PUSH 0 ; hModule = NULL CALL <JMP.&KERNEL32.GetModuleFileNameA> PUSH 104 ; BufSize = 104 (260.) PUSH ZoneLock.00404010 ; Buffer = ZoneLock.00404010 CALL <JMP.&KERNEL32.GetSystemDirectoryA> PUSH ZoneLock.00405544 ; src = \ PUSH ZoneLock.00404010 ; dest = C:\WINNT\system32 CALL <JMP.&CRTDLL.strcat> ADD ESP,8 LEA ECX,DWORD PTR DS:[404540] OR EAX,FFFFFFFF

Listing 8.3 The backdoor program s installation function. (continued)

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