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Network Security Snort-Signatures
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[Snort-sigs] Effective rule for bots

Subject: [Snort-sigs] Effective rule for bots
Date: Tue, 19 Apr 2005 11:16:58 -0500
I've been using this rule for a few weeks and it's working quite well to catch boxes infected with SDBot and other backdoors. Thought I'd share it.

alert tcp $HOME_NET any -> any 445 (msg: "ALERT!!! Excessive Port 445 traffic!!!"; flags:S; threshold: type both, track by_src, count 500, seconds 60; classtype:trojan-activity; sid: 10000006; rev: 2;)

Paul Schmehl (pauls@utdallas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu


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