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Re: C2 - Zeus?
From: Joel Esler <jesler () sourcefire com>
Date: Fri, 14 Jun 2013 14:49:34 -0400

Paul,

Here's what I came up with, and added:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zeus outbound connection"; 
flow:to_server,established; content:"/images/"; http_uri; content:".php?id="; distance:1; http_uri; 
pcre:"/\/images\/[a-zA-Z]\.php\?id\=[0-9]{2,3}(\.\d)?$/Ui"; metadata:policy balanced-ips drop, policy security-ips 
drop, ruleset community, service http; classtype:trojan-activity; sid:26923; rev:1;)

Thanks for your addition.

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire


On Jun 13, 2013, at 7:28 AM, Paul Bottomley <Paul.Bottomley () betfair com> wrote:

Might need running in your test lab for a week or so to see what it picks up… From observation so no reference.
 
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zeus outbound connection"; 
flow:established,to_server; content:"/images/"; fast_pattern:only; http_uri; 
pcre:"/\/images\/[a-zA-Z]{1}\.php\?id\=[0-9]{2,}/Ui"; classtype:trojan-activity; sid:xxxxxx; rev:1;)
 
Thanks

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