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encrypted code contained code that sets it back to zero and jumps back to that address. If you go back to look at every encrypted function you ve gone over, they all have this same mechanism. It appears to be a generic mechanism that reencrypts the function before it returns. The local variable is apparently required to tell the prologue code whether the function is currently being encrypted or decrypted. Here are those two lines from 401D18, the function you re trying to decrypt.

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Table 20.4 Conditional probabilities of liquefaction and overtopping given the existence or non-existence of low-density, soft lenses in an embankment Pr Low-density lenses exits No low-density lenses exist 0.1 0.9 Liquefaction 0.9 0 No liquefaction 0.1 1.0 Overtopping 0.67 0.01 No overtopping 0.33 0.99

00401D49 00401D50 00401D54 MOV DWORD PTR SS:[EBP-4],1 CMP DWORD PTR SS:[EBP-4],0 JE SHORT Defender.00401DBF

As usual, a local variable is being set to 1, and then checked for a zero value. If I m right about this, the decrypted code should contain an instruction just like the first one in the preceding sequence, except that the value being loaded is 0, not 1. Let s examine the code bytes for this instruction and determine exactly what you re looking for.

(20.7)

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round and bearing away together to head straight downwind. The boats then go round the leeward mark, back up to the windward mark and downwind to nish at the leeward mark.

00401D49 C745 FC 01000000 MOV DWORD PTR SS:[EBP-4],1

Here s the OllyDbg output that includes the instruction s code bytes. It looks like this is a 7-byte sequence should be more than enough to find the key. All you have to do is modify the 01 byte to 00, to create the following sequence:

Event node 0.001 0.1 0.7 0.2 0.25 0.75 0.15 0.5 0.2 0.1 0.5 0.2 Poisson process Seepage model Slope failure model Slope failure model Seepage model ditto Rating curve Rating curve Stochastic process

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The next step is to create a little program that contains a copy of the encrypted code (which you can rip directly from OllyDbg s data window) and decrypts the code using every possible key from 0 to FFFFFFFF. With each decrypted block the program must search for the token that 7-byte sequence you just prepared . As soon as you find that sequence in a decrypted block, you know that you ve found the correct decryption key. This is a pretty short block so it s unlikely that you d find the token in the wrong decrypted block. You start by determining the starting address and exact length of the encrypted block. Both addresses are loaded into local variables early in the decryption sequence:

Bottom conditions, debris/ice, etc. Bottom conditions, debris/ice, etc. Bottom conditions, debris/ice, etc. ditto ditto

00401D2C 00401D31 00401D32 00401D35 00401D3A 00401D3B PUSH Defender.00401E32 POP EAX MOV DWORD PTR SS:[EBP-14],EAX PUSH Defender.00401EB6 POP EAX MOV DWORD PTR SS:[EBP-C],EAX

In this sequence, the first value pushed into the stack is the starting address of the encrypted data and the second value pushed is the ending address. You go to Olly s dump window and dump data starting at 401E32. Now, you need to create a brute-forcer program and copy that decrypted data into it. Before you actually write the program, you need to get a better understanding of the encryption algorithm used by Defender. A quick glance at a decryption sequence shows that it s not just XORing the key against each DWORD in the code. It s also XORing each 32-bit block with the previous unencrypted block. This is important because it means the decryption process must begin at the same position in the data where encryption started otherwise the decryption process will generate corrupted data. We now have enough information to write our little decryption loop for the brute-forcer program.

Downwind tactics are all about beating the boats around you, putting any extra distance in the bag. When you get around the windward mark this is not the time to relax. You need to consider what your best options are; your positioning in relation to other boats makes a real difference. You have three options:

Distribution type, mean, variance, & skew Statistical regression parameters Statistical regression parameters Statistical regression parameters ditto

for (DWORD dwCurrentBlock = 0; dwCurrentBlock <= dwBlockCount; dwCurrentBlock++) { dwDecryptedData[dwCurrentBlock] = dwEncryptedData[dwCurrentBlock] ^ dwCurrentKey; dwDecryptedData[dwCurrentBlock] ^= dwPrevBlock; dwPrevBlock = dwEncryptedData[dwCurrentBlock]; }

This loop must be executed for each key! After decryption is completed you search for your token in the decrypted block. If you find it, you ve apparently hit the correct key. If not, you increment your key by one and try to decrypt and search for the token again. Here s the token searching logic.

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