detecting targetted malware

["lsi" <stuart () cyberdelix net>]

This is probably patented and implemented already but nonetheless its 
a new idea for me, so I mention it...

While mass-produced malware remains an issue for a most users, an 
significant threat is also posed by malware customised for a specific 
victim (so called 'targetted malware').  This threat is potentially 
worse as an organisation cannot rely on traditional AV or anti- 
spyware scanners to detect the targetted malware; as the malicious 
code is customised it does not have an entry in AV/AS signature 
databases.

Despite this, detecting customised code should be easy.  All that's 
needed is a scanner.  It simply finds every piece of executable code 
on a system.  It then compares each piece with its list of known-good 
executables.  Any executable that is found but is not on the list is 
an intruder.

This approach takes advantage of the fact that, unlike spam, we can 
make a list of all our known-good items.

Stu

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Stuart Udall
stuart at () cyberdelix dot net - http://www.cyberdelix.net/

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 * Origin: lsi: revolution through evolution (192:168/0.2)

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