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Rev: 1 • May 13, 2021, 12:00 PMET MALWARE Observed Malicious SSL Cert (Fake Gmail Self Signed - Possible Cobalt Stirke)
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (Fake Gmail Self Signed - Possible Cobalt Stirke)"; flow:established,to_client; tls.cert_subject; content:"C=US, ST=CA, L=Mountain View, O=Google GMail, OU=Google Mail, CN=gmail.com"; bsize:74; fast_pattern; tls.cert_issuer; content:"C=US, ST=CA, L=Mountain View, O=Google GMail, OU=Google Mail, CN=gmail.com"; bsize:74; reference:md5,b210c0f7687a9199de870e0cc11996c1; classtype:domain-c2; sid:2032952; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2021_05_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
May 13, 2021, 12:00 PM
May 13, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 11, 2025, 9:34 PM
rules/emerging-malware.rules