ET HUNTING User-Agent with Non Standard Characters

Query · suricata

flow:established,to_server;
http.user_agent;
content:"|3b 3b|";
content:"|3b 3b 2f 2e|"; distance:0; fast_pattern;
content:"|2e|"; endswith;
target:src_ip;
Raw source ET HUNTING User-Agent with Non Standard Characters · 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 User-Agent with Non Standard Characters";
    flow:established,to_server;
    http.user_agent;
    content:"|3b 3b|";
    content:"|3b 3b 2f 2e|"; distance:0; fast_pattern;
    content:"|2e|"; endswith;
    classtype:bad-unknown;
    sid:2044354; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_02_27, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_27;
    target:src_ip;
)

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