Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Cobalt Strike Related Domain (world .healthamericacu .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"world.healthamericacu.com"; bsize:25; fast_pattern; reference:md5,314a879c4cae8ae7c08d5fc207a5a22d; classtype:domain-c2; sid:2035128; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_02_08, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)