Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed FIN12 Related Cobalt Strike Domain (netrie .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"netrie.com"; bsize:10; fast_pattern; reference:md5,21b4d9c046db511738232582b41f453c; reference:url,www.mandiant.com/resources/fin12-ransomware-intrusion-actor-pursuing-healthcare-targets; classtype:command-and-control; sid:2034180; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_10_13, deployment Perimeter, malware_family Fin12, confidence High, signature_severity Major, tag c2, updated_at 2021_10_13, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)