alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Suspicious HTTP POST to 404.php"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/404.php"; endswith; fast_pattern; classtype:misc-activity; sid:2030819; rev:2; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2020_09_01, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_01;)