ET HUNTING Suspicious Windows NT version 1 User-Agent

Query · suricata

flow:established,to_server;
http.user_agent;
content:"Windows NT 1"; nocase;
content:!"0"; within:1;
pcre:"/^[^0-9]/R";
Raw source ET HUNTING Suspicious Windows NT version 1 User-Agent · 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 Windows NT version 1 User-Agent";
    flow:established,to_server;
    http.user_agent;
    content:"Windows NT 1"; nocase;
    content:!"0"; within:1;
    pcre:"/^[^0-9]/R";
    classtype:bad-unknown;
    sid:2015898; rev:6;
    metadata:created_at 2012_11_20, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_18;
)

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