alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Fake Browser Update Domain in TLS SNI (fb-extension .com)"; flow:established,to_server; tls.sni; bsize:16; content:"fb-extension.com"; fast_pattern; classtype:exploit-kit; sid:2062882; rev:1; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2025_06_11, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag compromised_website, tag AI_Generated_Description, updated_at 2025_06_11, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)