ET HUNTING Microsoft Office User-Agent Requesting An Excel File

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
pcre:"/\x2exls[xm]?$/";
http.user_agent;
content:"|3b 20|ms|2d|office|3b|"; fast_pattern;
Raw source ET HUNTING Microsoft Office User-Agent Requesting An Excel File · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Microsoft Office User-Agent Requesting An Excel File";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/\x2exls[xm]?$/";
    http.user_agent;
    content:"|3b 20|ms|2d|office|3b|"; fast_pattern;
    classtype:bad-unknown;
    sid:2037156; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_29, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_29;
)

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