ET HUNTING Suspicious Office Template Style Request (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/templates-"; startswith; fast_pattern;
pcre:"/\x3f(?:office|id|officeid)\x3d[A-Z0-9]{8,16}$/R";
http.user_agent;
content:!"|20 3b|ms-office|3b 20|";
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET HUNTING Suspicious Office Template Style Request (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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Suspicious Office Template Style Request (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/templates-"; startswith; fast_pattern;
    pcre:"/\x3f(?:office|id|officeid)\x3d[A-Z0-9]{8,16}$/R";
    http.user_agent;
    content:!"|20 3b|ms-office|3b 20|";
    http.header_names;
    content:!"Referer";
    reference:md5,44b3f46a370faf94cc51386b4ccaab83;
    reference:md5,1c64df70f2016714c24abcc69b56d46c;
    classtype:bad-unknown;
    sid:2042519; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_12_08, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_08;
    target:src_ip;
)

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