ET MALWARE Win32/Neutrino Bot Fake 404 Checkin Response

Query · suricata

flow:to_client,established;
http.stat_code;
content:"404";
file.data;
content:"<!--"; distance:0;
content:"NCMD|3a|"; within:6;
Raw source ET MALWARE Win32/Neutrino Bot Fake 404 Checkin Response · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Win32/Neutrino Bot Fake 404 Checkin Response";
    flow:to_client,established;
    http.stat_code;
    content:"404";
    file.data;
    content:"<!--"; distance:0;
    content:"NCMD|3a|"; within:6;
    reference:url,blog.fortinet.com/post/hiding-malicious-traffic-under-the-http-404-error;
    classtype:command-and-control;
    sid:2020949; rev:4;
    metadata:created_at 2015_04_20, malware_family Win32_Neutrino, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_04;
)

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