alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Malicious SSL certificate detected (Spy.Shiz CnC)"; flow:established,to_client; tls.cert_serial; content:"00:B8:59:43:E2:96:23:5B:17"; fast_pattern; tls.cert_subject; content:"O=Internet|20|Widgits|20|Pty|20|Ltd"; reference:md5,c0c8178b7ef2a8c067c68a7fb7dc7ecd; classtype:domain-c2; sid:2022021; rev:3; metadata:attack_target Client_and_Server, created_at 2015_11_03, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)