ET MALWARE Observed Koadic Header Structure

Query · suricata

flow:established,to_server;
http.header;
content:"|0d 0a|encoder|3a 20|";
content:"|0d 0a|shellchpc|3a 20|"; distance:0; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Observed Koadic Header 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 Observed Koadic Header Structure";
    flow:established,to_server;
    http.header;
    content:"|0d 0a|encoder|3a 20|";
    content:"|0d 0a|shellchpc|3a 20|"; distance:0; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:md5,1e1afc93c8092b2c7e49a6d3a451629f;
    classtype:trojan-activity;
    sid:2030341; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_15, deployment Perimeter, malware_family Koadic, confidence High, signature_severity Major, updated_at 2020_06_15;
)

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