alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Fingerprint Blacklist Malicious SSL certificate detected (KINS C2)"; flow:from_server,established; content:"|55 04 06|"; content:"|02|XX"; distance:1; within:3; content:"|55 04 07|"; distance:0; content:"|0c|Default City"; distance:1; within:13; content:"|55 04 0a|"; distance:0; content:"|13|Default Company Ltd"; fast_pattern; distance:1; within:20; tls.fingerprint:"47:46:41:98:fc:47:5a:2e:a1:76:18:38:b1:f8:0d:ea:e7:99:d0:5f"; classtype:domain-c2; sid:2018736; rev:10; metadata:attack_target Client_and_Server, created_at 2014_06_12, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_07_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)