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Network Security Snort-Signatures
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Re: [Snort-sigs] Re: Question about bleeding Netsky rule?

Subject: Re: [Snort-sigs] Re: Question about bleeding Netsky rule?
Date: Sat, 15 Jan 2005 13:13:49 +1100
Hi Matt,

On the subject of virus rules, "BLEEDING-EDGE VIRUS Korgo Worm IRC Connection" (sid:2001289; rev:2;) seems to me a little too broad.

It alerts when any TCP connection is made to selected IPs, to ports 6667:6670.

Some of those IPs include Undernet IRC servers which the Korgo worm possibly used, and therefore FP quite a bit on regular IRC traffic.

Just thought i'd mention it.




Regards,

Chris.


Matt Jonkman wrote:

You're correct, it should be tcp. Surprised snort hasn't complained about that one. Thanks for pointing it out.

Fixed and posted. Thanks

Matt

James Riden wrote:

From today's bleeding-virus.rules:

alert icmp $HOME_NET any -> any 25 (content:"8FI0MxBcdcOwU0QzEFL0MwBXBDMQWsS2wFIkMxBcdcOgUqQz"; msg:"BLEEDING-EDGE VIRUS Netsky base64 port 25"; classtype:trojan-activity; sid:2001283; rev:2; )

I don't understand the 'alert *icmp*'. Netsky is purely SMTP-based,
isn't it?

cheers,
Jamie






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