Alien Autopsy: Reverse Engineering Win32 Trojans on Linux

    Date14 Nov 2002
    3668
    Posted ByAnthony Pell
    In my last article, Reverse Engineering Hostile Code, I described the tools and processes involved in basic reverse engineering of a simple trojan. This article will offer a more detailed examination of the reversing process, using a trojan found in the . . . In my last article, Reverse Engineering Hostile Code, I described the tools and processes involved in basic reverse engineering of a simple trojan. This article will offer a more detailed examination of the reversing process, using a trojan found in the wild. At the same time, this article will discuss some techniques for reversing Windows-native code entirely under Linux. As an added bonus, all the tools used in this article are either freeware or free software.

    A deadlisting is simply a dump of the assembly language code of the trojan. We will be using IDA Pro Freeware Version for this purpose. This program does a terrific job of cross-referencing jumps, calls and string data, and really makes the assembly source easy to read. The best part is it now works on Linux under Wine. Just download the distribution from DataRescue's site, and unzip it into an empty directory. Then change to the directory where you unzipped IDA and run the Wine utility wcmd from the programs subdirectory of the Wine source code.

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