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Network Security Snort-Signatures
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[Snort-sigs] SSH Scans

Subject: [Snort-sigs] SSH Scans
Date: Mon, 23 Aug 2004 13:17:00 -0500
Seeing a ton of ssh brute force attempts against boxes all over the place. None successful since they're concentrating on root, but the rate is low enough that the portscan preprocessors aren't getting them (at the thresholds we usually use)

So I put this rule up on bleedingsnort.com:

alert tcp any any -> $HOME_NET 22 (msg:"BLEEDING-EDGE Potential SSH Brute Force Attack"; flow:to_server,established; threshold:type limit, track by_dst, count 5, seconds 60; classtype:attempted-dos; sid:2001219; rev:1;)

5 ssh connects in 60 seconds from one source is generally unusual.

Matt


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