ET INFO Suspected Phishing Simulation Related Request (GET)

Query · suricata

flow:established,to_server;
urilen:9;
http.method;
content:"GET";
http.uri;
pcre:"/^\/[A-Za-z]{3}-[A-Za-z0-9]{4}$/";
http.header_names;
content:!"Referer";
http.user_agent;
content:"|3b 20|ms-office|3b 20|";
http.host;
content:".com-office365.com"; endswith; fast_pattern;
target:src_ip;
Raw source ET INFO Suspected Phishing Simulation Related 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 -> $EXTERNAL_NET any (
    msg:"ET INFO Suspected Phishing Simulation Related Request (GET)";
    flow:established,to_server;
    urilen:9;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/^\/[A-Za-z]{3}-[A-Za-z0-9]{4}$/";
    http.header_names;
    content:!"Referer";
    http.user_agent;
    content:"|3b 20|ms-office|3b 20|";
    http.host;
    content:".com-office365.com"; endswith; fast_pattern;
    reference:md5,6c53f4d178b55d1deb4b1385d5efb1a9;
    reference:md5,13e25a506a7282762c46adfd408cdb94;
    classtype:bad-unknown;
    sid:2042539; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_12_09, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_09;
    target:src_ip;
)

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