alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (KINS C2)"; flow:established,to_client; tls.cert_serial; content:"00:EA:C4:EB:C7:A8:AE:C0:8C"; fast_pattern; tls.cert_subject; content:"CN=Internet|20|Widgits|20|Pty|20|Ltd"; startswith; reference:url,sslbl.abuse.ch; classtype:domain-c2; sid:2019148; rev:4; metadata:attack_target Client_and_Server, created_at 2014_09_10, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)