alert tls $HOME_NET any -> any any (msg:"ET MALWARE Win32/SocGholish CnC Domain in TLS SNI (* .trc20 .kcgrocks .com)"; flow:established,to_server; tls.sni; dotprefix; content:".trc20.kcgrocks.com"; fast_pattern; nocase; endswith; reference:url,community.emergingthreats.net/t/et-socgholish-rules-response-guidance/335; reference:url,infosec.exchange/@monitorsg/112472167215070364; classtype:domain-c2; sid:2057964; rev:3; metadata:attack_target Client_Endpoint, tls_state TLSEncrypt, created_at 2024_12_02, deployment Perimeter, deprecation_reason Relevance, malware_family SocGholish, performance_impact Low, confidence High, signature_severity Critical, updated_at 2025_01_16, reviewed_at 2025_01_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise; target:src_ip;)