ET INFO Observed request to common DOH pattern in URI M1

Query · suricata

flow:established,to_server;
http.uri;
content:"|2f|dns-query"; endswith;
http.content_type;
content:"application|2f|dns-message"; fast_pattern;
target:src_ip;
Raw source ET INFO Observed request to common DOH pattern in URI M1 · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET INFO Observed request to common DOH pattern in URI M1";
    flow:established,to_server;
    http.uri;
    content:"|2f|dns-query"; endswith;
    http.content_type;
    content:"application|2f|dns-message"; fast_pattern;
    classtype:misc-activity;
    sid:2065868; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_21, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_21;
    target:src_ip;
)

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