[Snort-users] PulledPork / Modifysid.conf Issues

JJC cummingsj at ...11827...
Thu Sep 19 12:29:16 EDT 2013


This looks like a by2 issue... and one that the new sid-msg.map version two
should help address..... This being said, any by2 folks care to chime in
here?

JJC


On Thu, Sep 19, 2013 at 9:29 AM, Turnbough, Bradley E. <
bturnbough at ...15650...> wrote:

> Gents,
>
> Snort ---2.9.3.1
> Pulled Pork ---0.6.1
> Barnyard2 ---2.1.9
> Sonrby ---2.5.3
>
> Rule BEFORE Pulled Pork modifysid processing:
> ------------------------------------------------------------
> alert udp $HOME_NET any -> $HOME_NET 53 (msg:"INDICATOR-COMPROMISE
> Suspicious .cn dns query"; flow:to_server; content:"|01 00 00 01 00 00 00
> 00 00 00|"; depth:10; offset:2; content:"|02|cn|00|"; distance:0;
> pcre:"/[\x05-\x20][bcdfghjklmnpqrstvwxyz]{5,32}[^\x00]*?\x02cn\x00/i";
> metadata:policy security-ips drop, service dns; classtype:trojan-activity;
> sid:15167; rev:11;)
>
> Rule after Pulled Pork modifysid processing:
> ------------------------------------------------------------
> alert udp $HOME_NET any -> $HOME_NET 53 (msg:"INDICATOR-COMPROMISE
> Suspicious .cn dns query"; flow:to_server; content:"|01 00 00 01 00 00 00
> 00 00 00|"; depth:10; offset:2; content:"|02|cn|00|"; distance:0;
> pcre:"/[\x05-\x20][bcdfghjklmnpqrstvwxyz]{5,32}[^\x00]*?\x02cn\x00/i";
> metadata:policy security-ips drop, service dns; classtype:misc-activity;
> sid:15167; rev:11;)
>
> Modifysid.conf:
> ------------------------------------------------------------
> 15167 "classtype:trojan-activity" "classtype:misc-activity";
> 19020 "classtype:trojan-activity" "classtype:misc-activity";
> 15168 "classtype:trojan-activity" "classtype:misc-activity";
>
> Classification.conf:
> ------------------------------------------------------------
> config classification: misc-activity,Misc activity,3
>
>
> What I'm trying to achieve:
> ------------------------------------------------------------
> I want to reclassify the rule from a HIGH priority (1) to a LOW priority
> (3).  It appears that pulled pork is doing its job, as I see the
> classification change in the rules file, but the event isn't being inserted
> by barnyard2 into the snorby database with a LOW priority as per the rule
> classification.  This is the very first time I've done this so I'm a bit
> confused as to why this is occurring.
>
> I've restarted both snort and also barnyard2, but no change in outcome.
>
>
> Ideas?
>
> Thanks,
>
> Brad
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