ET MALWARE WSF/JS Downloader Jan 30 2017 M1

Query · suricata

flow:to_server,established;
urilen:>65;
http.uri;
content:"/counter/?"; fast_pattern; depth:10;
content:"a=";
content:"i=";
pcre:"/[&?]i=[A-Za-z0-9_-]{50,}(?:&|$)/";
pcre:"/[&?]a=(?:[a-zA-Z0-9_-]{25,}|(?:0\.)?\d+)(?:&|$)/";
http.user_agent;
content:"MSIE 7.0";
http.header_names;
content:!"Referer|0d 0a|";
content:!"Cookie|0d 0a|";
Raw source ET MALWARE WSF/JS Downloader Jan 30 2017 M1 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE WSF/JS Downloader Jan 30 2017 M1";
    flow:to_server,established;
    urilen:>65;
    http.uri;
    content:"/counter/?"; fast_pattern; depth:10;
    content:"a=";
    content:"i=";
    pcre:"/[&?]i=[A-Za-z0-9_-]{50,}(?:&|$)/";
    pcre:"/[&?]a=(?:[a-zA-Z0-9_-]{25,}|(?:0\.)?\d+)(?:&|$)/";
    http.user_agent;
    content:"MSIE 7.0";
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"Cookie|0d 0a|";
    reference:md5,852cbd70766feb96923a79b210e94646;
    classtype:trojan-activity;
    sid:2023816; rev:4;
    metadata:created_at 2017_01_31, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_04;
)

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