Re: Frethem Virus Rules

[Shane Williams <shanew () shanew net>]

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Well, I spent some more time looking at some Frethem infected emails,
and here's the rule I came up with.  Please test it out and let me
know of any false positives or negatives.

alert tcp any any -> any 25 (msg:"Frethem.K virus in SMTP"; \
content:"Content-Type\: multipart/alternative\;|0d0a09|boundary=L1db82sd319dm2ns0f4383dhG"; \
sid:1000016; classtype:misc-activity; rev:1;)

On Wed, 17 Jul 2002, Shane Williams wrote:

> On Wed, 17 Jul 2002, Syam A. Yanuar wrote:
>
> >   Any one have snort rules with Frethem Virus ?.
>
> I've looked at the few samples I have, and unlike other recent
> viruses like Klez, the body seems to stay the same, so a body-based
> rule should be relatively easy to construct.
>
> Of course, that said, I haven't sat down and done it yet.

- -- 
Public key #7BBC68D9 at            |                 Shane Williams
http://pgp.mit.edu/                |                               
=----------------------------------+-------------------------------
All syllogisms contain three lines |              shanew () shanew net
Therefore this is not a syllogism  |   www.gslis.utexas.edu/~shanew

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