alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (Flokibot CnC)"; flow:established,to_client; tls.cert_serial; content:"00:9C:56:80:8C:3D:64:03:C6"; fast_pattern; tls.cert_subject; content:"C=XX"; content:"L=Default City"; reference:url,sslbl.abuse.ch; classtype:domain-c2; sid:2023554; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2016_11_29, deployment Perimeter, malware_family Flokibot, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_18, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)