ET HUNTING Office UA Retrieving Content on Unusually High Port

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.user_agent;
content:"|3b 20|ms-office|3b 20|"; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET HUNTING Office UA Retrieving Content on Unusually High Port · 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 1024: (
    msg:"ET HUNTING Office UA Retrieving Content on Unusually High Port";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.user_agent;
    content:"|3b 20|ms-office|3b 20|"; fast_pattern;
    http.header_names;
    content:!"Referer";
    classtype:bad-unknown;
    sid:2038899; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_09_19, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_19;
)

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