ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

Query · suricata

flow:established,to_server;
urilen:<15;
http.method;
content:"GET";
http.uri;
content:".exe"; endswith; fast_pattern;
pcre:"/^\/\d+\/\d+\.exe$/";
http.header;
pcre:"/^Host\x3a[^\r\n]+\r\n(?:(?:Cache-Control|Pragma)\x3a[^\r\n]+\r\n)?(?:\r\n)?$/mi";
http.header_names;
content:!"User-Agent|0d 0a|";
content:!"Accept";
content:!"Referer|0d 0a|";
content:"|0d 0a|Host|0d 0a|"; startswith;
Raw source ET MALWARE Potential Dridex.Maldoc Minimal Executable Request · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Potential Dridex.Maldoc Minimal Executable Request";
    flow:established,to_server;
    urilen:<15;
    http.method;
    content:"GET";
    http.uri;
    content:".exe"; endswith; fast_pattern;
    pcre:"/^\/\d+\/\d+\.exe$/";
    http.header;
    pcre:"/^Host\x3a[^\r\n]+\r\n(?:(?:Cache-Control|Pragma)\x3a[^\r\n]+\r\n)?(?:\r\n)?$/mi";
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    content:"|0d 0a|Host|0d 0a|"; startswith;
    reference:md5,2cea5182d71b768e8b669cacdea39825;
    classtype:trojan-activity;
    sid:2020941; rev:5;
    metadata:created_at 2015_04_17, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_13;
)

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