alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SocGholish CnC Domain in TLS SNI (* .fans .smalladventureguide .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".fans.smalladventureguide.com"; endswith; nocase; fast_pattern; reference:url,community.emergingthreats.net/t/et-socgholish-rules-response-guidance/335; reference:url,infosec.exchange/@monitorsg/112472167215070364; classtype:domain-c2; sid:2054195; rev:5; metadata:attack_target Client_Endpoint, tls_state TLSEncrypt, created_at 2024_07_01, deployment Perimeter, deprecation_reason Relevance, malware_family SocGholish, performance_impact Low, confidence High, signature_severity Critical, tag compromised_website, updated_at 2024_12_24, reviewed_at 2024_09_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise; target:src_ip;)