alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed DarkComet RAT Domain (ultradelux .buzz in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".ultradelux.buzz"; endswith; fast_pattern; reference:url,go.recordedfuture.com/hubfs/reports/cta-2024-0514.pdf; classtype:trojan-activity; sid:2052598; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_05_14, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)