Versions (5)
Version DetailsCurrent
Rev: 10 • Jul 30, 2010, 12:00 PMET HUNTING Suspicious Non-Escaping backslash in User-Agent Inbound
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Suspicious Non-Escaping backslash in User-Agent Inbound"; flow:established,to_server; http.user_agent; content:"|5c|"; fast_pattern; depth:200; pcre:"/^.*[^\x5c]\x5c[^\x5c\x3d\x2f\x3b\x28\x29]/"; content:!"|5c|Citrix|5c|ICA Client|5c|"; nocase; reference:url,www.w3.org/Protocols/rfc2616/rfc2616-sec14.html; reference:url,mws.amazon.com/docs/devGuide/UserAgent.html; classtype:bad-unknown; sid:2010722; rev:10; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_07;)
Jul 30, 2010, 12:00 PM
Mar 7, 2024, 12:00 PM
Sep 21, 2024, 3:00 AM
Oct 9, 2025, 9:35 PM
rules/emerging-hunting.rules