PCRE plugin for exact phrase match

[Dan <sophie_bo () earthlink net>]

Do I need the pcre plugin and the perl plugin, or just the pcre plugin?

http://www.snort.org/dl/contrib/patches/snort-pcre/

http://www.snort.org/dl/contrib/patches/snort-perl/

-----Original Message-----
From: "Schmehl, Paul L" <pauls () utdallas edu>
Sent: Dec 18, 2003 3:02 PM
To: 
Cc: snort-users () lists sourceforge net
Subject: RE: [Snort-users] exact phrase match

> -----Original Message-----
> From: Dan [mailto:sophie_bo () earthlink net] 
> Sent: Thursday, December 18, 2003 4:39 PM
> To: Brian; Schmehl, Paul L
> Cc: snort-users () lists sourceforge net
> Subject: Re: [Snort-users] exact phrase match
>
> Could you please tell me what the pcre:"/\bnc.exe\b/"; 
> parameter does? Does this tell Snort to only alert on an 
> exact phrase match?
Pcre is just Perl Compatible Regular Expressions.  The expression
/\bnc.exe\b/ means 
"match the string nc.exe with a word boundary at the beginning and end
of the string".  So nc.exe must be a word that has no preceding or
trailing letters.  That eliminates matching on things such as "sync.exe"
because the beginning word boundary is not nc, by sync.
 
Paul Schmehl (pauls () utdallas edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu/~pauls/ 


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