alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OldGremlin/TA801 Domain in TLS SNI (1cbit .org)"; flow:established,to_server; tls.sni; bsize:9; content:"1cbit.org"; fast_pattern; reference:url,habr.com/ru/companies/f_a_c_c_t/articles/836264/; classtype:trojan-activity; sid:2055283; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_08_15, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_15, reviewed_at 2025_01_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)