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IsDebuggerPresent is a Windows API that can be used as a trivial tool for detecting user-mode debuggers such as OllyDbg or WinDbg (when used as a user-mode debugger). The function accesses the current process s Process Environment Block (PEB) to determine whether a user-mode debugger is attached. A program can call this API and terminate if it returns TRUE, but such a method is not very effective against reversers because it is very easy to detect and bypass. The name of this API leaves very little room for doubt; when it is called, a reverser will undoubtedly find the call very quickly and eliminate or skip it. One approach that makes this API somewhat more effective as an antidebugging measure is to implement it intrinsically, within the program code. This way the call will not stand out as being a part of antidebugger logic. Of course you can t just implement an API intrinsically you must actually copy its code into your program. Luckily, in the case of IsDebuggerPresent this isn t really a problem, because the implementation is trivial; it consists of four lines of assembly code. Instead of directly calling IsDebuggerPresent, a program could implement the following code.

Resistance factors from the AASHTO bridge design code for all limiting states of shallow footings are given in Table 18.8. For this same set of resistance factors in the AASHTO code, Withiam et al. (1997) evaluate equivalent factors of safety using the relationship, FS LRFD = / (18.32)

mov eax,fs:[00000018] mov eax,[eax+0x30] cmp byte ptr [eax+0x2], 0 je RunProgram ; Inconspicuously terminate program here...

Assuming that the actual termination is done in a reasonably inconspicuous manner, this approach would be somewhat more effective in detecting usermode debuggers, because it is more difficult to detect. One significant disadvantage of this approach is that it takes a specific implementation of the IsDebuggerPresent API and assumes that two internal offsets in NT data structure will not change in future releases of the operating system. First, the

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in which is the average load factor, assuming = 1.45 for bearing capacity and sliding and = 1.35 for overall stability, and compares these implicit values to the older ASD factors of safety common in bridge design practice. Withiam goes on to recommend that, for different ASD factors of safety or for load factors different than those assumed in the development of Table 18.8, the following relationship be used: modi ed = tabulated FS tabulated FS desired tabulated actual (18.33)

code retrieves offset +30 from the Thread Environment Block (TEB) data structure, which points to the current process s PEB. Then the sequence reads a byte at offset +2, which indicates whether a debugger is present or not. Embedding this sequence within a program is risky because it is difficult to predict what would happen if Microsoft changes one of these data structures in a future release of the operating system. Such a change could cause the program to crash or terminate even when no debugger is present. The only tool you have for evaluating the likeliness of these two data structures to change is to look at past versions of the operating systems. The fact is that this particular API hasn t changed between Windows NT 4.0 (released in 1996) and Windows Server 2003. This is good because it means that this implementation would work on all relevant versions of the system. This is also a solid indicator that these are static data structures that are not likely to change. On the other hand, always remember what your investment banker keeps telling you: past performance is not indicative of future results. Just because Microsoft hasn t changed these data structures in the past 7 years doesn t necessarily mean they won t change them in the next 7 years. Finally, implementing this approach would require that you have the ability to somehow incorporate assembly language code into your program. This is not a problem with most C/C++ compilers (the Microsoft compiler supports the _asm keyword for adding inline assembly language code), but it might not be possible in every programming language or development platform.

there is more breeze near land. Rotate the upper diagram in gure 3.3b to match your shoreline. This is because the wind coming off the land is converging with the wind on the water (wind coming off the land is at a slightly different angle). The area of greater wind will vary but can often be up to 25% stronger than the wind offshore. When the land is on your right and the wind is on your left, for example:

The NtQuerySystemInformation native API can be used to determine if a kernel debugger is attached to the system. This function supports several different types of information requests. The SystemKernelDebuggerInformation request code can obtain information from the kernel on whether a kernel debugger is currently attached to the system.

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