alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"GPL WEB_SERVER /_vti_bin/ access"; flow:to_server,established; content:"/_vti_bin/"; http_uri; nocase; reference:nessus,11032; classtype:web-application-activity; sid:2101288; rev:12; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)