alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Outbound PHP User-Agent"; flow:established,to_server; http.user_agent; content:"PHP/"; nocase; startswith; reference:url,www.useragentstring.com/pages/useragentstring.php; classtype:attempted-recon; sid:2013058; rev:6; metadata:created_at 2011_06_17, confidence High, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)