alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed ClickFix Related Inject Domain (cdn .optitc .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".cdn.optitc.com"; endswith; fast_pattern; reference:url,urlscan.io/responses/cf83b20333770eb529eb230c7a48de6cdb9cfab777ed66fa1cf5bc4676bce6af/; classtype:trojan-activity; sid:2061870; rev:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2025_04_24, deployment Perimeter, malware_family ClickFix, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag compromised_website, updated_at 2025_04_24, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)