ET MALWARE W2KM_BARTALEX Downloading Payload 2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".txt";
pcre:"/\/\d{4,}\.txt$/";
http.user_agent;
content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern;
http.header_names;
content:!"Referer|0d 0a|";
content:"Accept|0d 0a|";
content:"Accept-Language|0d 0a|";
Raw source ET MALWARE W2KM_BARTALEX Downloading Payload 2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE W2KM_BARTALEX Downloading Payload 2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".txt";
    pcre:"/\/\d{4,}\.txt$/";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; fast_pattern;
    http.header_names;
    content:!"Referer|0d 0a|";
    content:"Accept|0d 0a|";
    content:"Accept-Language|0d 0a|";
    reference:md5,545ee3114faa5abd994f9730713f2261;
    classtype:trojan-activity;
    sid:2021304; rev:5;
    metadata:created_at 2015_06_19, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_29;
)

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