full-disclosure - Backdoor not recognized by Kaspersky

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Message-ID: <E075A187B11EED409B12D00100CAAD662D99@ntserver.meltemi.local>
From: Jos at meltemi.co.uk (Jos Osborne)
Subject: Backdoor not recognized by Kaspersky

>Does anyone else find this new development a bad idea?
>
>I'm of the mindset that anti-virus companies should stick with what 
>they're good at -- namely, detecting and handling infected files.  It 
>seems a bad idea to start down the natural language processing road. 
>Are they scanning just for Bagle/Beagle style e-mail, or are their 
>methods more general?  What about messages of the form:
>
>'Password is a long yellow fruit enjoyed by monkeys.'
>

IMHO, anybody who actually thinks for a second of unzipping an attachment with that kind of message is straying into AskingForItland.
Even better how about:

'Password is a long yellow fruit enjoyed by monkeys. FALSE Password: 22103'

So the Av software scans the Zip as perfectly safe, and informs the user that all is well.

>
>What about messages in languages other than English?  I can easily see 
>this becoming an arms-race, and one the anti-virus folks have no chance 
>of winning.

What about "compression bombs"? Trying to add another task is just opening another vulnerability.

Jos