ET USER_AGENTS Microsoft Office Existence Discovery User-Agent

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Microsoft Office Existence Discovery"; bsize:36;
threshold:type both, track by_src, count 1, seconds 600;
Raw source ET USER_AGENTS Microsoft Office Existence Discovery User-Agent · 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 -> $EXTERNAL_NET any (
    msg:"ET USER_AGENTS Microsoft Office Existence Discovery User-Agent";
    flow:established,to_server;
    http.user_agent;
    content:"Microsoft Office Existence Discovery"; bsize:36;
    threshold:type both, track by_src, count 1, seconds 600;
    classtype:misc-activity;
    sid:2041131; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_11_30, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_30, reviewed_at 2025_10_24;
)

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