ET MALWARE W32/Zbot.InfoStealer WindowsUpdate Connectivity Check With Opera UA

Query · suricata

flow:established,to_server;
urilen:1;
http.method;
content:"GET";
http.user_agent;
content:"Opera/9.25 (Windows NT 6.0|3b 20|U|3b|"; fast_pattern; startswith;
http.host;
content:"windowsupdate.microsoft.com"; startswith;
http.connection;
content:"Close"; bsize:5;
http.header_names;
content:!"|0d 0a|Referer|0d 0a|";
content:!"|0d 0a|Accept";
Raw source ET MALWARE W32/Zbot.InfoStealer WindowsUpdate Connectivity Check With Opera UA · 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 MALWARE W32/Zbot.InfoStealer WindowsUpdate Connectivity Check With Opera UA";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"GET";
    http.user_agent;
    content:"Opera/9.25 (Windows NT 6.0|3b 20|U|3b|"; fast_pattern; startswith;
    http.host;
    content:"windowsupdate.microsoft.com"; startswith;
    http.connection;
    content:"Close"; bsize:5;
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    content:!"|0d 0a|Accept";
    reference:md5,aa696180cd0369e264ed8e9137a4f254;
    classtype:trojan-activity;
    sid:2018419; rev:8;
    metadata:created_at 2014_04_25, signature_severity Major, updated_at 2024_03_10;
)

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