alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed ClearFake Domain (cdnforfiles .xyz in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".cdnforfiles.xyz"; endswith; fast_pattern; classtype:trojan-activity; sid:2052862; rev:1; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2024_05_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag ClearFake, tag compromised_website, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)