alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET PHISHING CoGUI 404 Response 2026-02-04"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"|7b 22|code|22 3a|404|2c 22|message|22 3a 22 2f|open|2f|visitors|2f|info|2f|validateHuman|20|Not|20|Found|22 7d|"; fast_pattern; classtype:credential-theft; sid:2067327; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_02_05, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Phishing, tag CoGUI, tag CoAceV, updated_at 2026_02_05, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)