THL HUNT FleetAgentFUD Default .NET WebClient User-Agent + WebSocket Upgrade (Custom C2 Client Indicator)

SID: 3500155Rev: 1Enabled7 views
Filehunters-ledger.rules
CreatedJuly 16, 2026
UpdatedJuly 16, 2026
Classificationtrojan-activity
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"THL HUNT FleetAgentFUD Default .NET WebClient User-Agent + WebSocket Upgrade (Custom C2 Client Indicator)"; flow:established,to_server; http.user_agent; content:"Mozilla/4.0 (compatible|3b| MSIE 6.0|3b| Windows NT 5.2|3b| .NET CLR"; http.header; content:"Connection|3a 20|Upgrade"; threshold:type limit,track by_src,count 1,seconds 3600; classtype:trojan-activity; sid:3500155; rev:1; metadata:author The_Hunters_Ledger, date 2026-01-12, reference https://the-hunters-ledger.com/hunting-detections/fleetagentfud-exe-detections/;)

Metadata

authorThe_Hunters_Ledger
date2026-01-12
referencehttps://the-hunters-ledger.com/hunting-detections/fleetagentfud-exe-detections/

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