ET HUNTING Invalid User-Agent - MSIE 9 on Windows NT 5

Query · suricata

flow:established,to_server;
threshold:type limit,track by_src,count 2,seconds 60;
http.user_agent;
content:" MSIE 9.0|3b| Windows NT 5."; fast_pattern;
Raw source ET HUNTING Invalid User-Agent - MSIE 9 on Windows NT 5 · 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 Invalid User-Agent - MSIE 9 on Windows NT 5";
    flow:established,to_server;
    threshold:type limit,track by_src,count 2,seconds 60;
    http.user_agent;
    content:" MSIE 9.0|3b| Windows NT 5."; fast_pattern;
    reference:url,windows.microsoft.com/en-us/internet-explorer/products/ie-9/system-requirements;
    classtype:bad-unknown;
    sid:2016897; rev:9;
    metadata:created_at 2013_05_21, confidence Medium, signature_severity Informational, updated_at 2022_06_27;
)

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