Snort mailing list archives
Re: Snort rule doesn't generate alerts when hosts responding simultaneously
From: Balasubramaniam Natarajan <bala150985 () gmail com>
Date: Mon, 12 Mar 2012 08:20:11 +0530
Hi Aymen, A tag is used to tag both the source and destination and capture more packets of them rather than just one IP address. In the original rule once Snort sees PRIVMSG it would have tagged x.x.x.x going to y.y.y.y and it would have captured all alerts up to 300 seconds. If you only stuff is to see how many client systems are involved in the bot you can changed the rule to alert tcp any any -> any any (msg:"PRIVMSG from an IRC channel suspecious act"; content:"PRIVMSG"; offset:0; depth:7; nocase; dsize:<64; flow:to_server,established; classtype:bad-unknown; sid:2000346; rev:5;) Kindly correct me if I am wrong. On Thu, Mar 8, 2012 at 9:21 AM, Aymen AlAwady <aymenco777 () googlemail com>wrote:
Hi, alert tcp any any -> any any (msg:"PRIVMSG from an IRC channel suspecious act"; content:"PRIVMSG"; offset:0; depth:7; nocase; dsize:<64; flow:to_server,established; tag:session,300,seconds; classtype:bad-unknown; sid:2000346; rev:4;) The above rule is written to monitor bots responding messages to the botmaster. The rule is working fine, but only when one bot making the respond and there is no alert or even one alert for one host when more than one host responding simultaneously. I have changed the session time to 30 or 150 but no luck. Any tips or tricks to make it efficient? Thanks. -Aymen -- Aymen Hassan AlAwady Master Student of Computer Science (Distributed Computing & Networks) School of Computer Sciences - Universiti Sains Malaysia (USM) 11800 USM, Penang, MALAYSIA H/P: +60176181394 Email: aymenh () it kuiraq com P Do you really need to print this e-mail? Think globally, act locally undefined ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Snort-sigs mailing list Snort-sigs () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-sigs http://www.snort.org Please visit http://blog.snort.org for the latest news about Snort!
-- Regards, Balasubramaniam Natarajan www.etutorshop.com/moodle/
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Current thread:
- Snort rule doesn't generate alerts when hosts responding simultaneously Aymen AlAwady (Mar 07)
- Fwd: Snort rule doesn't generate alerts when hosts responding simultaneously Aymen AlAwady (Mar 11)
- Re: Snort rule doesn't generate alerts when hosts responding simultaneously Balasubramaniam Natarajan (Mar 11)
- Re: Snort rule doesn't generate alerts when hosts responding simultaneously Balasubramaniam Natarajan (Mar 11)
- Re: Snort rule doesn't generate alerts when hosts responding simultaneously Joel Esler (Mar 12)
- Re: Snort rule doesn't generate alerts when hosts responding simultaneously Balasubramaniam Natarajan (Mar 11)