alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Havoc Demon Domain (ukrtatnafta .org in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".ukrtatnafta.org"; endswith; fast_pattern; reference:url,www.fortinet.com/blog/threat-research/malware-disguised-as-document-ukraine-energoatom-delivers-havoc-demon-backdoor; classtype:domain-c2; sid:2056538; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_10_07, deployment Perimeter, malware_family Havoc, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_10_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)