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Network Security Snort-Signatures
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Re: [Snort-sigs] SSH brute force attack sig

from [bmc] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] SSH brute force attack sig
Date: Wed, 6 Jul 2005 15:27:01 -0400 
On Wed, Jul 06, 2005 at 01:01:02PM -0500, Matt Jonkman wrote:

SCAN/SCAN_SSH_Brute_Force:
alert tcp $EXTERNAL_NET any -> $HOME_NET 22 (msg: "BLEEDING-EDGE
Potential SSH Scan"; flags: S; flowbits: set,ssh.brute.attempt;
threshold: type threshold, track by_src, count 5, seconds 120;
classtype: suspicious-login; sid: 2001219; rev:10; )


We've tweaked this one to be near perfect.


Heh.  Did you put "near perfect" in the message to get me to pipe up?

Whats wrong with using sfportscan to detect this scan?  This "near
perfect" rule implements a crude network scan detection at a fairly
hefty cost to performance.

Brian


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