Re: Win.Trojan.CowerSnail signatures

[Tyler Montier <tmontier () sourcefire com>]

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 () 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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