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The total block size is calculated according to the following formula: BlockSize = NTDLLCodeSize + (TotalExports + 1) * 8. You re still not sure what Defender is doing here, but you know that it has something to do with NTDLL s code section and with its export directory. The function proceeds into another iteration of the NTDLL export list, again computing that strange checksum for each function name. In this loop there are two interesting lines that write into the newly allocated memory block:

When leading the race you must decide on your tactics to stay there: you may wish to allow the eet to follow you.

Not Overtopped (S2) Dam Overtopped (F2)

The preceding lines are executed for each exported function in NTDLL. They treat the allocated memory block as an array. The first writes the current function s checksum, and the second writes the exported function s RVA (Relative Virtual Address) into the same memory address plus 4. This indicates that the newly allocated memory block contains an array of data structures, each 8 bytes long. Offset +0 contains a function name s checksum, and offset +4 contains its RVA. The following is the next code sequence that seems to be of interest:

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004038FD 00403903 00403906 00403909 0040390F 00403912 00403916 00403918 0040391B 0040391D 0040391F 00403922 MOV MOV ADD MOV MOV LEA MOV SHR REP MOV AND REP EAX,DWORD PTR [EBP-C8] ESI,DWORD PTR [EBP+8] ESI,DWORD PTR [EAX+2C] EAX,DWORD PTR [EBP-D8] EDX,DWORD PTR [EBP-C] EDI,DWORD PTR [EDX+EAX*8+8] EAX,ECX ECX,2 MOVS DWORD PTR ES:[EDI],DWORD PTR [ESI] ECX,EAX ECX,3 MOVS BYTE PTR ES:[EDI],BYTE PTR [ESI]

(IF1S2)

This sequence performs a memory copy, and is a commonly seen sentence in assembly language. The REP MOVS instruction repeatedly copies DWORDs

11

(IF1F2)

7

from the address at ESI to the address at EDI until ECX is zero For each DWORD that is copied ECX is decremented once, and ESI and EDI are both incremented by four (the sequence is copying 32 bits at a time) The second REP MOVS performs a byte-by-byte copying of the last 3 bytes if needed This is needed only for blocks whose size isn t 32-bit-aligned Let s see what is being copied in this sequence ESI is loaded with [EBP+8] which is NTDLL s base address, and is incremented by the value at [EAX+2C] Going back a bit you can see that EAX contains that same PE header address you were looking at earlier If you go back to the PE headers you dumped earlier from WinDbg, you can see that Offset +2c is BaseOf Code.

Figure 20.6 Event tree showing event probabilities calculated with associated fault trees for individual events (McCormick 1981).

EDI is loaded with an address within your newly allocated memory block, at the point right after the table you ve just filed Essentially, this sequence is copying all the code in NTDLL into this memory buffer So here s what you have so far You have a memory block that is allocated in runtime, with a specific effort being made to put it at a random address This code contains a table of checksums of the names of all exported functions from NTDLL alongside their RVAs Right after this table (in the same block) you have a copy of the entire NTDLL code section Figure 1115 provides a graphic visualization of this interesting and highly unusual data structure Now, if I saw this kind of code in an average application I would probably think that I was witnessing the work of a mad scientist.

In a serious copy protection this makes a lot of sense This is a mechanism that allocates a memory block at a random virtual address and creates what is essentially an obfuscated interface into the operating system module You ll soon see just how effective this interface is at interfering with reversing efforts (which one can only assume is the only reason for its existence) The huge function proceeds into calling another function, at 4030E5 This function starts out with two interesting loops, one of which is:.

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