Re: Trojan.APT.Seinup sig with pcre help request

[James Lay <jlay () slave-tothe-box net>]

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

And yet another fix...thanks to those that have helped out:

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}=[a-z0-9]{48}\x26[a-z0-9]{7,9}=[a-z0-9]{32}\x26[a-z0-9]{14,16}=/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:3;)

James

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