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one another using SBB (subtract with borrow). SBB subtracts the two integers and treats the carry flag (CF) as a borrow indicator in case the first subtraction generated a borrow. For more information on 64-bit arithmetic refer to the section on 64-bit arithmetic in Appendix B. The result of the subtraction is compared to 77359400. If it is below, the function just loops back to the beginning. If not (or if the SBB instruction produces a nonzero result, indicating that the high part has changed), the function goes through another exported function search, this time looking for a function whose string checksum is 1BF08AE, and then calls this API. You re not sure which API this is at this point, but stepping over this code is very insightful. It turns out that when you step through this code the check almost always fails (whether this is true or not depends on how fast your CPU is and how quickly you step through the code). Once you get to that API call, stepping into it in SoftICE you see that the program is calling NtTerminateProcess. At this point, you re starting to get a clear picture of what our thread is all about. It is essentially a timing monitor that is meant to detect whether the process is being paused and simply terminate it on the spot if it is. For this, Defender is utilizing the RDTSC instruction and is just checking for a reasonable number of ticks. If between the two invocations of RDTSC too much time has passed (in this case too much time means 77359400 clock ticks or 2 billion clock ticks in decimal), the process is terminated using a direct call to the kernel.

It is going to be effectively impossible to debug Defender while this thread is running, because the thread will terminate the process whenever it senses that a debugger has stalled the process. To continue with the cracking process, you must neutralize this thread. One way to do this is to just avoid calling the thread creation function, but a simpler way is to just patch the function in memory (after it is decoded) so that it never calls NtTerminateProcess. You do this by making two changes in the code. First, you replace the JNZ at 00403075 with NOPs (this check confirms that the result of the subtraction is 0 in the high-order word). Then you replace the JNZ at address 0040307E with a JMP, so that the final code looks like the following:

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If the conditions are very ukey, you may just have to get on with your own race. The wind may be very different just 20 yards away, and you could end up losing by

(IF1F2)

00403075 00403076 00403077 0040307E NOP NOP CMP DWORD PTR SS:[EBP-60],77359400 JMP SHORT Defender.004030C2

This means that the function never calls NtTerminateProcess, regardless of the time that passes between the two invocations of RDTSC. Note that applying this patch to the executable so that you don t have to reapply it every time you launch the program is somewhat more difficult because this function is

Figure 20.8 Logic tree describing xed-but-unknown conditions (states) of nature, as conditioning point for event tree of system.

11

The event tree structure appends to individual leaves of the logic tree, so that all calculations within the event tree are conditioned on the realized states of nature in the logic tree. This simultaneously accounts for dependencies anywhere in the event tree due to the common realization of states of nature in the logic tree. The nal combined tree need be no more complex than before, since the number of combinations of all uncertain events, both aleatory and epistemic, remains the same.

encrypted you must either modify the encrypted data or eliminate the encryption altogether. Neither of these options is particularly easy, so for now you ll just reapply the patch in memory each time you launch the program.

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You might remember that before taking this little detour to deal with that RDTSC thread you were looking at a KERNEL32DLL string right in the middle of the code Let s find out what is done with this string Immediately after the string appears in the code the program is retrieving pointers for two NTDLL functions, one with a checksum of 1974C, and another with the familiar 6DEF20 (the checksum for NtDelayExecution) The code first calls NtDelayExecution and then the other function In stepping into the second function in SoftICE, you see a somewhat more confusing picture This API isn t just another direct call down into the kernel, but instead it looks like this API is actually implemented in NTDLL, which means that it s now implemented inside your copied code This makes it much more difficult to determine which API this is.

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