ET INFO Microsoft OAuth 2.0 Device Auth Activity M3 (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/common/oauth2/v2.0/authorize?client_id="; fast_pattern;
content:"redirect_uri="; distance:0;
http.host;
content:"login.microsoftonline.com";
target:src_ip;
Raw source ET INFO Microsoft OAuth 2.0 Device Auth Activity M3 (GET) · 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 Microsoft OAuth 2.0 Device Auth Activity M3 (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/common/oauth2/v2.0/authorize?client_id="; fast_pattern;
    content:"redirect_uri="; distance:0;
    http.host;
    content:"login.microsoftonline.com";
    reference:url,learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-device-code#device-authorization-request;
    classtype:misc-activity;
    sid:2066330; rev:1;
    metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_12_15, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2025_12_15;
    target:src_ip;
)

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