ET DOS User-Agent used in known DDoS Attacks Detected outbound 2

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Opera/9.02 (Windows NT 5.1|3b 20|U|3b 20|ru)";
Raw source ET DOS User-Agent used in known DDoS Attacks Detected outbound 2 · 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 DOS User-Agent used in known DDoS Attacks Detected outbound 2";
    flow:established,to_server;
    http.user_agent;
    content:"Opera/9.02 (Windows NT 5.1|3b 20|U|3b 20|ru)";
    reference:url,www.linuxquestions.org/questions/linux-security-4/massive-ddos-need-advice-help-795298/;
    classtype:denial-of-service;
    sid:2011823; rev:4;
    metadata:created_at 2010_10_18, confidence High, signature_severity Major, updated_at 2020_05_06;
)

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