ET MALWARE Possible Kelihos.F EXE Download Common Structure

Query · suricata

flow:established,to_server;
urilen:12;
http.method;
content:"GET";
http.uri;
content:".exe"; fast_pattern;
pcre:"/^(?:\/[a-z]+\d*?)?\/\d?\w+\d*?\.exe$/";
http.host;
pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/";
http.header_names;
content:"|0d 0a|Host|0d 0a 0d 0a|"; depth:10; endswith;
Raw source ET MALWARE Possible Kelihos.F EXE Download Common Structure · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Possible Kelihos.F EXE Download Common Structure";
    flow:established,to_server;
    urilen:12;
    http.method;
    content:"GET";
    http.uri;
    content:".exe"; fast_pattern;
    pcre:"/^(?:\/[a-z]+\d*?)?\/\d?\w+\d*?\.exe$/";
    http.host;
    pcre:"/^(?:\d{1,3}\.){3}\d{1,3}$/";
    http.header_names;
    content:"|0d 0a|Host|0d 0a 0d 0a|"; depth:10; endswith;
    reference:md5,f5bcc28e7868a68e473373d684a8c54a;
    classtype:trojan-activity;
    sid:2017598; rev:12;
    metadata:created_at 2013_10_15, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_14;
)

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