ET MALWARE Potential Dridex.Maldoc Minimal Executable Request

Query · suricata

flow:established,to_server;
urilen:<40;
http.method;
content:"GET";
http.uri;
content:".exe"; fast_pattern;
pcre:"/\/[a-z0-9]+\/[a-z0-9]+\.exe$/i";
http.header;
content:!"MstarUpdate";
http.user_agent;
content:!"Mozilla/";
http.host;
content:!".bitdefender.com";
content:!".homestead.com";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; depth:22; endswith;
Raw source ET MALWARE Potential Dridex.Maldoc Minimal Executable Request · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Potential Dridex.Maldoc Minimal Executable Request";
    flow:established,to_server;
    urilen:<40;
    http.method;
    content:"GET";
    http.uri;
    content:".exe"; fast_pattern;
    pcre:"/\/[a-z0-9]+\/[a-z0-9]+\.exe$/i";
    http.header;
    content:!"MstarUpdate";
    http.user_agent;
    content:!"Mozilla/";
    http.host;
    content:!".bitdefender.com";
    content:!".homestead.com";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; depth:22; endswith;
    reference:md5,28208e19a528bfa95e5662e2d6f2e911;
    reference:url,blogs.cisco.com/security/dridex-attacks-target-corporate-accounting;
    classtype:trojan-activity;
    sid:2020826; rev:11;
    metadata:created_at 2015_04_01, performance_impact Moderate, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08;
)

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