Rule History

alert http $HTTP_SERVERS $HTTP_PORTS -> $EXTERNAL_NET any (msg:"ET SCAN Unusually Fast 404 Error Messages (Page Not Found), Possible Web Application Scan/Directory Guessing Attack"; flow:from_server,established; content:"HTTP/1.1 404"; depth:13; threshold: type threshold, track by_dst, count 30, seconds 60; reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec10.html; reference:url,en.wikipedia.org/wiki/HTTP_404; classtype:attempted-recon; sid:2009885; rev:3; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)