alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (StrongPity Domain)"; flow:from_server,established; tls.cert_subject; content:"CN=debian"; nocase; endswith; tls.cert_serial; content:"CB:E2:F0:46:19:AE:BE:40"; classtype:domain-c2; sid:2026668; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2018_11_26, 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_09_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)