alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INAPPROPRIATE Evil Keitaro to Adult Websites Set-Cookie Inbound (3f06b)"; flow:established,to_client; http.cookie; content:"3f06b=eyJ0e"; fast_pattern; pcre:"/^[A-Z0-9_\-.]{20,300}\x3b/Ri"; classtype:exploit-kit; sid:2063364; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_07_08, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Minor, tag Keitaro_TDS, tag Description_Generated_By_Proofpoint_Nexus, tag Keitaro, updated_at 2025_07_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)