ET MALWARE Incorrectly formatted User-Agent string (dashes instead of semicolons) Likely Hostile

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Mozilla/4.0 (compatible- MSIE 6.0- Windows NT 5.1- SV1-|20|"; depth:56; fast_pattern;
Raw source ET MALWARE Incorrectly formatted User-Agent string (dashes instead of semicolons) Likely Hostile · 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 MALWARE Incorrectly formatted User-Agent string (dashes instead of semicolons) Likely Hostile";
    flow:established,to_server;
    http.user_agent;
    content:"Mozilla/4.0 (compatible- MSIE 6.0- Windows NT 5.1- SV1-|20|"; depth:56; fast_pattern;
    classtype:bad-unknown;
    sid:2010868; rev:9;
    metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2020_10_17;
)

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