Re: Receiving alerts for a disabled rule

[Anshuman Anil Deshmukh <anshuman () cybage com>]

Hi,



As specified in my initial mail, all the snort rules reside in one single file. So there’s no question about using 
different .rules files. I am logging all the alerts to SNORBY on a MYSQL database. There’s no delay when to writing to 
MYSQL database using barnyard. And also I see that there are no alerts queued in SNORBY, worker service is running 
normally.



Any other thoughts? Please let me know if I need to post any of my config files.



Thanks.



Regards,

Anshuman



From: SnortFan [mailto:SnortFan () yahoo com]
Sent: Friday, February 28, 2014 10:25 PM
To: Anshuman Anil Deshmukh
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Receiving alerts for a disabled rule



Hmm try this:



Double check your snort.conf to make sure of where your pulling your rules from. Then do a grep in that folder against 
all the .rules files against the Sid number.  Maybe it's in another file that's getting used?



Also, are you looking at it from an interface like base or at the new unified2 file it starts writing too upon restart. 
The reason I'm asking is that an tool like base could have alerts queued.



Cheers,

Ed



Sent from a mobile device.


On Feb 28, 2014, at 8:15 AM, Anshuman Anil Deshmukh <anshuman () cybage com<mailto:anshuman () cybage com>> wrote:

   Hi Joel,



   The rule is disabled. I even restarted the snort machine but still alerts for this rule are getting generated. 
Please help.



   Here is the actual rule-



   # alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS (msg:"DOS generic web server hashing collision attack"; 
sid:20825; gid:3; rev:8; classtype:attempted-dos; reference:cve,2011-3414; 
reference:url,events.ccc.de/congress/2011/Fahrplan/events/4680.en.html<http://events.ccc.de/congress/2011/Fahrplan/events/4680.en.html>;
 
reference:url,technet.microsoft.com/en-us/security/advisory/2659883<http://technet.microsoft.com/en-us/security/advisory/2659883>;
 
reference:url,technet.microsoft.com/en-us/security/bulletin/MS11-100<http://technet.microsoft.com/en-us/security/bulletin/MS11-100>;
 reference:cve,2012-0830; reference:cve,2010-1899; reference:cve,2011-5037; metadata: engine shared, soid 3|20825, 
service http;)



   Regards,

   Anshuman





   From: Joel Esler (jesler) [mailto:jesler () cisco com]
   Sent: Thursday, February 20, 2014 9:06 PM
   To: Anshuman Anil Deshmukh
   Cc: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
   Subject: Re: [Snort-users] Receiving alerts for a disabled rule



   If you are receiving the alert from the rule, then it is either:



   A) Not disabled

   B) You didn’t restart Snort after you disabled it.



   --
   Joel Esler
   Threat Intelligence Team Lead
   Open Source Manager
   Vulnerability Research Team



   On Feb 20, 2014, at 7:03 AM, Anshuman Anil Deshmukh <anshuman () cybage com<mailto:anshuman () cybage com>> wrote:






      Hi,



      Recently I found that I am getting alerts for one of the rule which is commented out. What could be the possible 
reason for generating such alert when the rule is disabled?



      Here are my setup details below.



      Snort version: Version 2.9.5 GRE (Build 103)

      Barnyard version: Version 2.1.9 (Build 263) - XFF patch (version 2)

      Rules are updating using pulledpork version 0.70 where all rules reside in one single file



      Below are the references of the actual rule and the alert generated on SNORBY.





      <image004.jpg>





      Thanks and Regards,

      Anshuman

      Information Security-Analyst




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