ET MALWARE AHK/BKDR_HTV.ZKGD-A Fake HTTP 500 Containing Encoded Commands Inbound

Query · suricata

flow:established,from_server;
http.header;
content:"charset=UTF-8";
http.response_line;
content:"HTTP|2f|1.0|20|500|20|Internal|20|Server|20|Error";
file.data;
content:"500|20|Internal|20|Server|20|Error|3c 21 2d 2d|"; fast_pattern;
pcre:"/^[A-F0-9]+\x2d\x2d\x3e(?:\r\n)?$/R";
Raw source ET MALWARE AHK/BKDR_HTV.ZKGD-A Fake HTTP 500 Containing Encoded Commands Inbound · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE AHK/BKDR_HTV.ZKGD-A Fake HTTP 500 Containing Encoded Commands Inbound";
    flow:established,from_server;
    http.header;
    content:"charset=UTF-8";
    http.response_line;
    content:"HTTP|2f|1.0|20|500|20|Internal|20|Server|20|Error";
    file.data;
    content:"500|20|Internal|20|Server|20|Error|3c 21 2d 2d|"; fast_pattern;
    pcre:"/^[A-F0-9]+\x2d\x2d\x3e(?:\r\n)?$/R";
    reference:url,blog.trendmicro.co.jp/archives/19054;
    classtype:trojan-activity;
    sid:2027156; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_04_04, deployment Perimeter, malware_family BKDR_HTV_ZKGD_A, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_08_28;
)

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