alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET HUNTING Suspicious PHP Code in HTTP POST (Inbound)"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"<?php"; content:"/bin/bash"; fast_pattern; within:500; classtype:attempted-admin; sid:2031126; rev:2; metadata:attack_target Web_Server, created_at 2020_10_27, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_27;)