alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET WEB_SERVER WebShell Generic - net user"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"net"; nocase; content:!"work"; within:4; nocase; content:"user"; nocase; within:11; content:!"-agent"; nocase; within:6; pcre:"/net(?:%(?:25)?20|\s)+user/i"; classtype:bad-unknown; sid:2016680; rev:7; metadata:created_at 2013_03_27, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_01;)