alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OldGremlin/TA801 Domain in TLS SNI (diadok .net)"; flow:established,to_server; tls.sni; bsize:10; content:"diadok.net"; fast_pattern; reference:url,habr.com/ru/companies/f_a_c_c_t/articles/836264/; classtype:trojan-activity; sid:2055281; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_08_15, deployment Perimeter, malware_family OldGremlin, malware_family TA801, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_26, reviewed_at 2025_01_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)