alert tcp $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE Torrentlocker C2 Domain in SNI"; flow:established,to_server; content:"|00 00 0d|krusperon.net"; fast_pattern; nocase; reference:url,www.hybrid-analysis.com/sample/3ebc6999da89eaf44d94195b588cb869d894ca754a248b074893d11f6dd19188?environmentId=4; reference:md5,2c339dbb40b3b19ee275e4c7c1c17a18; classtype:command-and-control; sid:2021254; rev:3; metadata:created_at 2015_06_11, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)