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Rootkit Collection
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An XML/RSS feed that includes both NEWS and BLOGS for RootKit is here: XML/RSS.
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Using Data Samples
Jul 19 2007, 04:05 (UTC+0) | hoglund writes: A big part of Active Reversing is the reliance on data as opposed to code. I feel that, in many cases, the data is far more important than the code in terms of answering reverse engineering questions. The video link below shows off one technique I use to find decryption routines in malware. The idea is simple actually - even though incoming packets may be encrypted they must eventually get decrypted. If they contain something you can search for than this can rapidly reveal the point at which packets have been decrypted. This will place you very near the decryption routine, if not right on top of it.
In the example I am using cryptcat, and I obviously have control of what I'm injecting into the server. This highlights the technique of course, but if you don't know what the decrypted data looks like you can settle for more generic types of analysis - for example, just finding any ASCII string, or perhaps searching for IRC commands. There is a subtle detail in the movie however, that is easy to miss. The dataflow trace that you see on the bottom of the trace window is a *real* dataflow trace. It's not just reporting access to the original buffer - it's reporting access to any copy of the buffer - in other words, it tracks EVERY derivation of the original data. This includes arithmetic, so calculations that are made also have their results tracked. So, in the event you don't know what to search for, you can actually use dataflow tracing to identify every function that touches derived data.
Here is a screenshot. There is link to www.hbgary.com for the movie.

The movie: http://www.hbgary.com/fast_cryptcat_hunt.wmv
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ROOTKITS, Subverting the Windows Kernel
By: Greg Hoglund and Jamie Butler
Rootkits are powerful tools to compromise computer systems without detection. Get the original and best book on the subject here.
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