alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (StrongPity CnC)"; flow:from_server,established; tls.cert_serial; content:"0E:4D:5A:5C:F8:C9"; classtype:domain-c2; sid:2028926; rev:2; metadata:attack_target Client_and_Server, created_at 2019_10_31, deployment Perimeter, malware_family StrongPity, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_21, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)