[Snort-sigs] Win.Trojan.CowerSnail signatures

Y M snort at outlook.com
Mon Jul 31 08:35:48 EDT 2017


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/3fb8a4d2ed4f662a4cb4270bb5f488b79c8758aa6fc5c8b119c78fba38d6b7d1; 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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