[Snort-sigs] C2 - Zeus?

Paul Bottomley Paul.Bottomley at ...3813...
Fri Jun 14 03:52:32 EDT 2013


Joel,

Have a look here:

http://urlquery.net/search.php?q=%5C%2Fimages%5C%2F%5Ba-zA-Z%5D%7B1%7D%5C.php%5C%3Fid%5C%3D%5B0-9%5D%7B2%2C%7D&type=regexp&start=2013-05-29&end=2013-06-13&max=50

Those 3 domains are definitely C2 servers (I've seen them all in pcaps I have)... there are probably more... so looking at the URL pattern its either 2 or 3 digits, and an optional period at the end, so you can probably change it yes.

I can send you a pcap I have directly if you like?

Thanks,
Paul

From: Joel Esler [mailto:jesler at ...435...]
Sent: 13 June 2013 18:46
To: Paul Bottomley
Cc: Snort-sigs
Subject: Re: [Snort-sigs] C2 - Zeus?

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 at ...3813...<mailto: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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