Re: Rig Exploit Kit outbound URI request signature

["Nicholas Mavis (nmavis)" <nmavis () cisco com>]

Forgot a forward slash in the content match. Revised below:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"EXPLOIT-KIT Rig Exploit Kit Outbound DGA Request"; 
flow:to_server,established; content:”/nbe.html?0."; http_uri; fast_pattern:only; 
pcre:"/^\/nbe\.html\?0\.[0-9]{16,17}$/Ui”; flowbits:set,file.exploit_kit.jar&file.exploit_kit.silverlight; 
metadata:service http; classtype:trojan-activity; )

From: nmavis <nmavis () cisco com<mailto:nmavis () cisco com>>
Date: Thursday, July 3, 2014 at 12:49 PM
To: "snort-sigs () lists sourceforge net<mailto:snort-sigs () lists sourceforge net>" <snort-sigs () lists sourceforge 
net<mailto:snort-sigs () lists sourceforge net>>
Subject: [Snort-sigs] Rig Exploit Kit outbound URI request signature

We have a few rules for Rig Exploit Kit however here is one for the DGA algorithm used. The reference article and rule 
are below:

http://www.symantec.com/connect/ko/blogs/rig-exploit-kit-used-recent-website-compromise

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"EXPLOIT-KIT Rig Exploit Kit Outbound DGA Request"; 
flow:to_server,established; content:"nbe.html?0."; http_uri; fast_pattern:only; 
pcre:"/^\/nbe\.html\?0\.[0-9]{16,17}$/Ui”; flowbits:set,file.exploit_kit.jar&file.exploit_kit.silverlight; 
metadata:service http; classtype:trojan-activity; )

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