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Re: C2 - Zeus?
From: Joel Esler <jesler () sourcefire com>
Date: Thu, 13 Jun 2013 13:45:46 -0400

Paul,

A couple comments, 

In your pcre you end with "id\=[0-9]{2,}", is there something after the two digits?  or does it end there?  (Can we do 
"id\=[0-9]{2}$")  As it stands right there, "2," will keep searching on and on.

Also, [a-zA-Z]{1}…  The {1} is unnecessary in this case.

Any pcaps here?


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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