RE: welchia rule

[Mark.Schutzmann () Omron com]

Paul,

This is an excellent rule- I also immediately detected a couple of rogue
computers. Thanks for sharing. Is there a way to (or how did you) determine
how many packets/hits per second/minute that an event is triggering the
snort rule?

Thanks,
 Mark


                                                                                                                        
                          
                      "Schmehl, Paul L"                                                                                 
                          
                      <pauls () utdallas edu>                To:       "Leonard Miller" <Leonard.Miller () udlp com>,   
                                
                      Sent by:                             <snort-users () lists sourceforge net>, <dortega () uacj mx> 
                                
                      snort-users-admin () lists sour        cc:                                                        
                             
                      ceforge.net                         Subject:  RE: [Snort-users] welchia rule                      
                          
                                                                                                                        
                          
                                                                                                                        
                          
                      11/04/2003 04:11 PM                                                                               
                          
                                                                                                                        
                          
                                                                                                                        
                          




> -----Original Message-----
> From: Leonard Miller [mailto:Leonard.Miller () udlp com]
> Sent: Tuesday, November 04, 2003 2:39 PM
> To: snort-users () lists sourceforge net; dortega () uacj mx;
> Leonard Miller; Schmehl, Paul L
> Subject: RE: [Snort-users] welchia rule
>
>
> Would it matter if the payload was aaaaaaaaaaaaaaaaaaaa
> and not aaaa aaaa aaaa aaaa
> The reason I ask is that I saw on arachNIDS that the rule was
> a little different and picked up as CyberKit 2.2 Windows

No sooner did I send the updated rule and I began to see some alerts for
non-infected boxes, so I upped the "count" value to 1000.  An infected
box will generate 2500 alerts a minute or more, so it could be moved
higher.  I'm just trying to be conservative.

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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