ET HUNTING Suspicious User-Agent (Random String)

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Random String"; bsize:13;
Raw source ET HUNTING Suspicious User-Agent (Random String) · Suricata
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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 (Random String)";
    flow:established,to_server;
    http.user_agent;
    content:"Random String"; bsize:13;
    reference:md5,a1e56bd465d1c1b5fc19384a3a7ec461;
    classtype:trojan-activity;
    sid:2028947; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2019_11_07, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, updated_at 2019_11_07;
)

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