ET INFO Tailscale DERP Websocket Upgrade Request

Query · suricata

flow:established,to_server;
http.header;
content:"sec-websocket-protocol|3a 20|derp"; fast_pattern; nocase;
Raw source ET INFO Tailscale DERP Websocket Upgrade Request · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> any any (
    msg:"ET INFO Tailscale DERP Websocket Upgrade Request";
    flow:established,to_server;
    http.header;
    content:"sec-websocket-protocol|3a 20|derp"; fast_pattern; nocase;
    reference:url,tailscale.com/docs/reference/derp-servers;
    classtype:misc-activity;
    sid:2071769; rev:1;
    metadata:tls_state TLSDecrypt, created_at 2026_08_24, deployment Perimeter, deployment Internal, confidence High, signature_severity Informational, updated_at 2026_08_24;
)

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