alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed ClearFake Domain (artservice .online in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".artservice.online"; endswith; fast_pattern; reference:url,www.threatdown.com/blog/clearfake-walkthrough-06-03-2024/; classtype:trojan-activity; sid:2053493; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_06_13, deployment Perimeter, deprecation_reason Relevance, malware_family ClearFake, confidence High, signature_severity Major, tag compromised_website, updated_at 2025_04_21, reviewed_at 2025_04_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)