alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Javascript Mobile Device Check"; flow:established,to_client; http.response_body; content:"function|20|ismobile"; nocase; fast_pattern; content:"navigator.userAgent"; content:"|7c|iPhone|7c|"; threshold:type limit,count 1,seconds 300,track by_src; classtype:misc-activity; sid:2070079; rev:1; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_06_26, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2026_06_26, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1205, mitre_technique_name Traffic_Signaling; target:dest_ip;)