alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (MageCart Group 1/2 CnC)"; flow:from_server,established; tls.cert_issuer; content:"C=GB, ST=Berkshire, L=Newbury, O=My Company Ltd"; tls.cert_serial; content:"00:BD:98:61:EE:0E:3E:D9:1D"; reference:url,go.flashpoint.com/docs/inside-magecart-by-Flashpoint-and-RiskIQ; classtype:domain-c2; sid:2026589; rev:2; metadata:attack_target Client_and_Server, created_at 2018_11_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)