Snort mailing list archives
Re: Klez false positive
From: Shane Williams <shanew () shanew net>
Date: Thu, 11 Jul 2002 07:51:18 -0500 (CDT)
On Thu, 11 Jul 2002, Claudiu wrote:
Hi all, I have active the last rule set from snort site and I am receiving a lot of Klez alerts which are false positive. The string "VGhpcyBwcm9" which Klez rule is looking for is found, for example, in shokwaveinstaler.exe as well. Does anyone has a better rule? Thanks.
I've been using the following rule for a couple of months, and I haven't seen any false positives (I'm also using it as a system-wide procmail filter and I check for false positives there). I purposely put in some of the carriage returns so it's less likely to set off people's filters. Note also that I want to know if it's leaving my network as well as coming in. # Catch Klez in SMTP alert tcp any any -> any 25 (msg:"Virus - Klez"; content:"135AAItEjhyJRI8ci0SOGI lEjxiLRI4UiUSPFItEjhCJRI8Qi0SODIlEjwyLRI4IiUSPCItE"; sid:10012; classtype:misc-activity; rev:1;) -- Public key #7BBC68D9 at | Shane Williams http://pgp.mit.edu/ | =----------------------------------+------------------------------- All syllogisms contain three lines | shanew () shanew net Therefore this is not a syllogism | www.gslis.utexas.edu/~shanew ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek PC Mods, Computing goodies, cases & more http://thinkgeek.com/sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- Klez false positive Claudiu (Jul 11)
- Re: Klez false positive Shane Williams (Jul 11)