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Detecting Mutating Javascript
From: TSS <tss () activeattack com>
Date: Wed, 18 Nov 2009 06:24:02 -0600

Hi,

I'm looking for people working on detecting mutating Javascript. I've
been working on detecting Javascript encoded in whitespace and
have come up with a few ideas so far: 
* Signature detection on the decoder function (lame)
* Analyzing the whitespace to try to find encoded information (decent, 
  but difficult because there could be so many encoding schemes)
* Building character frequency maps from non-malicious Javascript 
  libraries and detecting anomalies in the number of whitespace 
  characters compared to the average.
I'm basically just looking to benchmark the stuff I've done so far 
against the work of other people.  Any tips you could give me would
be appreciated. :)

Oh also, I'm wondering if anyone knows of Javascript worms that 
have made use of this technique.  I'd like to run my detector against
actual code found in the wild, but I'm not sure where to find it.

TSS

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