Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed GhostWriter APT Related Cobalt Strike Domain (ao3 .hmgo .pw in TLS SNI)"; flow:established,to_server; tls.sni; content:"ao3.hmgo.pw"; bsize:11; fast_pattern; reference:url,cert.gov.ua/article/38155; reference:url,twitter.com/netresec/status/1506990534547709972; reference:url,tria.ge/220324-p4dl5adghn; reference:md5,b5525108912ee8d5f1519f1b552723e8; classtype:domain-c2; sid:2035601; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_24, deployment Perimeter, malware_family Cobalt_Strike, malware_family Ghostwriter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)