alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET WEB_SERVER WebShell - Pouya - URI - action="; flow:established,to_server; http.uri; content:".asp?action="; nocase; fast_pattern; pcre:"/\.asp\?action=(?:txt(?:edit|view)|upload|info|del)(?:&|$)/i"; classtype:trojan-activity; sid:2017091; rev:4; metadata:created_at 2013_07_02, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_18;)