ET HUNTING Suspicious User-Agent (Agent and 5 or 6 digits)

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Agent"; depth:5;
pcre:"/^Agent\d{5,6}$/i";
http.host;
content:!"cloud.10jqka.com.cn";
content:!".maxthon.com";
Raw source ET HUNTING Suspicious User-Agent (Agent and 5 or 6 digits) · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Suspicious User-Agent (Agent and 5 or 6 digits)";
    flow:established,to_server;
    http.user_agent;
    content:"Agent"; depth:5;
    pcre:"/^Agent\d{5,6}$/i";
    http.host;
    content:!"cloud.10jqka.com.cn";
    content:!".maxthon.com";
    classtype:trojan-activity;
    sid:2013315; rev:15;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_07_12, deployment Perimeter, confidence Medium, signature_severity Major, tag User_Agent, updated_at 2022_05_03;
)

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