Versions (4)
Version DetailsCurrent
Rev: 3 • Jul 30, 2010, 12:00 PMET SCAN Unusually Fast 400 Error Messages (Bad Request), Possible Web Application Scan
alert http $HTTP_SERVERS $HTTP_PORTS -> $EXTERNAL_NET any (msg:"ET SCAN Unusually Fast 400 Error Messages (Bad Request), Possible Web Application Scan"; flow:from_server,established; content:"HTTP/1.1 400"; depth:13; threshold:type threshold, track by_dst, count 30, seconds 60; reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec10.html; reference:url,support.microsoft.com/kb/247249; classtype:attempted-recon; sid:2009884; rev:3; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)
Jul 30, 2010, 12:00 PM
Jul 26, 2019, 12:00 PM
Sep 21, 2024, 3:00 AM
Oct 2, 2025, 10:34 PM
rules/emerging-scan.rules