alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET WEB_SERVER PHP SERVER SuperGlobal in POST"; flow:established,to_server; http.request_body; content:"_SERVER["; fast_pattern; pcre:"/(?:[&\?\r\n]|^)_SERVER\[[^\]]+?\][^=]*?=/"; reference:url,imperva.com/download.asp?id=421; classtype:bad-unknown; sid:2017443; rev:4; metadata:created_at 2013_09_10, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_21;)