[Emerging-Sigs] 2002034 issue

Gibson, Nathan J. (HSC) Nathan-Gibson at ouhsc.edu
Sun Oct 23 11:30:11 EDT 2011

So this is something ET peeps fix?

From: "jesler at sourcefire.com<mailto:jesler at sourcefire.com>" <jesler at sourcefire.com<mailto:jesler at sourcefire.com>>
Date: Sun, 23 Oct 2011 10:27:04 -0500
To: Nathan Gibson <nathan-gibson at ouhsc.edu<mailto:nathan-gibson at ouhsc.edu>>
Cc: "Emerging-sigs at emergingthreats.net<mailto:Emerging-sigs at emergingthreats.net>" <Emerging-sigs at emergingthreats.net<mailto:Emerging-sigs at emergingthreats.net>>
Subject: Re: [Emerging-Sigs] 2002034 issue

This is because a "depth" is being used with the fast_pattern:only statement.  You can't do that.

On Oct 23, 2011, at 11:21 AM, Gibson, Nathan J. (HSC) wrote:

Been running ET for awhile know. Had this error today. Any thoughts?

10/23/2011 2:01 AM :   snort[29071]: FATAL ERROR: /etc/snort/rules/snort.rules(3219) Fast pattern only contents cannot be relative or have non-zero offset/depth content modifiers.

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN IRC Potential bot command response"; flow:established,to_server; content:"PRIVMSG "; fast_pattern:only; depth:8; content:"|3a|"; within:30; pcre:"/((T?FTP)\x3a File transfer|(random|sequential) Port Scan|Random (Spreading|Scanner)|Exploiting IP|Exploiting\.\.|flooding\x3a|flood stopped|sending packets)|Random Method started|FINDFILE|Scan stopped|No scan thread found|thread\(s\) stopped|\x3aExec /i"; reference:url,doc.emergingthreats.net/2002033<http://doc.emergingthreats.net/2002033>; classtype:trojan-activity; sid:2002033; rev:16;)
alert tcp $HOME_NET $HTTP_PORTS -> $EXTERNAL_NET any (msg:"ET ATTACK_RESPONSE Possible /etc/passwd via HTTP (linux style)"; flow:established,from_server; content:"root|3a|x|3a|0|3a|0|3a|root|3a|/root|3a|/"; nocase; reference:url,doc.emergingthreats.net/bin/view/Main/2002034<http://doc.emergingthreats.net/bin/view/Main/2002034>; classtype:misc-activity; sid:2002034; rev:8;)

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