alert tls $HOME_NET any -> any any (msg:"ET MALWARE Win32/TA569 Gholoader CnC Domain in TLS SNI (feedback .bigsightsystems .com)"; flow:established,to_server; tls.sni; content:"feedback.bigsightsystems.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:2063302; rev:2; metadata:attack_target Client_Endpoint, tls_state TLSEncrypt, created_at 2025_07_04, deployment Perimeter, malware_family SocGholish, performance_impact Low, confidence High, signature_severity Critical, tag ta569, tag compromised_website, updated_at 2026_06_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise; target:src_ip;)