Versions (5)
Version DetailsCurrent
Rev: 1 • Aug 3, 2022, 12:00 PMET MALWARE Observed Malicious SSL/TLS Certificate (Knotweed/SubZero)
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL/TLS Certificate (Knotweed/SubZero)"; flow:from_server,established; tls.cert_subject; content:"CN=realmetaldns.com"; fast_pattern; classtype:domain-c2; sid:2037901; rev:1; metadata:attack_target Client_and_Server, created_at 2022_08_03, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Aug 3, 2022, 12:00 PM
Aug 3, 2022, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 1, 2025, 8:35 PM
rules/emerging-malware.rules