[Snort-sigs] Win.Trojan.CowerSnail signatures

Tyler Montier tmontier at sourcefire.com
Mon Jul 31 09:30:53 EDT 2017


Yaser,

Thanks for your submission. We will review the rules and get back to you
when they're finished.

Thanks,

Tyler Montier
Cisco Talos

On Mon, Jul 31, 2017 at 8:35 AM, Y M via Snort-sigs <
snort-sigs at lists.snort.org> wrote:

> Hello,
>
>
> Another set of signatures derived from references. A pcap was downloaded
> from the reference and tested against.
>
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE-CNC
> Win.Trojan.CowerSnail outbound connection attempt";
> flow:to_server,established; content:"+CHANNEL|0B|"; fast_pattern:only;
> content:"line-client"; distance:0; reference:url,securelist.com/
> cowersnail-from-the-creators-of-sambacry/79087/; reference:url,www.hybrid-
> analysis.com/sample/3fb8a4d2ed4f662a4cb4270bb5f488
> b79c8758aa6fc5c8b119c78fba38d6b7d1; metadata:ruleset community;
> classtype:trojan-activity; sid:110002; rev:1;)
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"MALWARE-CNC
> Win.Trojan.CowerSnail outbound connection attempt";
> flow:to_client,established; content:"R|00|e|00|q|00|u|00|e|00|s|00|t|00|";
> fast_pattern:only; content:"|00|a|00|r|00|g|00|"; distance:0;
> content:"|00|t|00|y|00|p|00|e|00|"; distance:0; reference:url,
> securelist.com/cowersnail-from-the-creators-of-sambacry/79087/;
> reference:url,www.hybrid-analysis.com/sample/
> 3fb8a4d2ed4f662a4cb4270bb5f488b79c8758aa6fc5c8b119c78fba38d6b7d1;
> metadata:ruleset community; classtype:trojan-activity; sid:110003; rev:1;)
>
> Thanks.
>
> YM
>
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