Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ABUSE.CH SSL Blacklist Malicious SSL certificate detected (Ransomware CnC)"; flow:established,to_client; content:"|09 00 d5 e5 ff f2 10 0a 35 d0|"; fast_pattern; tls.cert_subject; bsize:43; content:"C=XX, L=Default City, O=Default Company Ltd"; reference:url,sslbl.abuse.ch; classtype:command-and-control; sid:2021603; rev:3; metadata:attack_target Client_Endpoint, created_at 2015_08_10, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_02, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)