ET MALWARE Win32/Ursnif Connectivity Check

Query · suricata

flow:established,to_server;
urilen:21;
http.method;
content:"GET";
http.uri;
content:"/proto/netstrings.txt";
http.header_names;
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE Win32/Ursnif Connectivity Check · 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 Win32/Ursnif Connectivity Check";
    flow:established,to_server;
    urilen:21;
    http.method;
    content:"GET";
    http.uri;
    content:"/proto/netstrings.txt";
    http.header_names;
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,9134651a7c642798414d867874bdfe2f;
    reference:url,csis.dk/en/csis/news/4472/;
    classtype:trojan-activity;
    sid:2019381; rev:4;
    metadata:created_at 2014_10_09, malware_family Win32_Ursnif, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_12;
)

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