[Snort-sigs] C2 - Zeus?

Joel Esler jesler at ...435...
Fri Jun 14 14:49:34 EDT 2013


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

On Jun 13, 2013, at 7:28 AM, Paul Bottomley <Paul.Bottomley at ...3813...> 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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