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Rev: 1 • Jan 26, 2021, 12:00 PMET MALWARE Observed Targeted Attack Malicious SSL Cert (opsonew3org .sg)
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Targeted Attack Malicious SSL Cert (opsonew3org .sg)"; flow:established,to_client; tls.cert_subject; content:"CN=opsonew3org.sg"; bsize:17; fast_pattern; reference:url,blog.google/threat-analysis-group/new-campaign-targeting-security-researchers/; classtype:domain-c2; sid:2031552; rev:1; metadata:attack_target Client_and_Server, created_at 2021_01_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Jan 26, 2021, 12:00 PM
Jan 26, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 15, 2025, 9:36 PM
rules/emerging-malware.rules