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Re: Trojan.APT.Seinup sig with pcre help request
From: James Lay <jlay () slave-tothe-box net>
Date: Thu, 20 Jun 2013 09:03:28 -0600

On 2013-06-19 12:07, James Lay wrote:
This one hurt my head:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS 
(msg:"MALWARE-CNC
Trojan.Win32.APT.Seinup outbound connection";
flow:to_server,established; content:"php|3f|"; http_uri;
pcre:"/\x2ephp\x3fa-z0-9]{11,13}=[a-z0-9]{3,7}\x26/"; metadata:policy
balanced-ips drop, policy security-ips drop, service http;

reference:url,http://www.fireeye.com/blog/technical/malware-research/2013/06/trojan-apt-seinup-hitting-asean.html;

classtype:trojan-activity; sid:10000081; rev:1;)

Is that PCRE too beefy?  I didn't go the full length of the url..it's
pretty nuts.  Thanks for any help on this all.

James


Updated rule to nuke some FP's:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC 
Trojan.Win32.APT.Seinup outbound connection"; 
flow:to_server,established; content:".php|3f|"; http_uri; 
pcre:"/\x2ephp\x3f[a-z0-9]{11,13}=[a-z0-9]{3,7}\x26[a-z0-9]{3,5}=/iU"; 
metadata:policy balanced-ips drop, policy security-ips drop, service 
http; 
reference:url,http://www.fireeye.com/blog/technical/malware-research/2013/06/trojan-apt-seinup-hitting-asean.html; 
classtype:trojan-activity; sid:10000081; rev:2;)

James

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