ET HUNTING Suspicious Non-Escaping backslash in User-Agent Outbound

7.0.35.0SID: 2010721Rev: 10Disabled1 views
Sourceet/open
Fileemerging-hunting.rules
CreatedJuly 30, 2010
UpdatedMarch 19, 2024
Classificationbad-unknown
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Non-Escaping backslash in User-Agent Outbound"; flow:established,to_server; http.user_agent; content:"|5C|"; fast_pattern; depth:200; pcre:"/^[^\x5c\x3d\x2f\x3b\x28\x29]/R"; 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:2010721; rev:10; metadata:created_at 2010_07_30, confidence Medium, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_19;)

References

urlwww.w3.org/Protocols/rfc2616/rfc2616-sec14.html
urlmws.amazon.com/docs/devGuide/UserAgent.html

Metadata

created at2010_07_30
confidenceMedium
signature severityUnknown
tagDescription_Generated_By_Proofpoint_Nexus
updated at2024_03_19

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