ET MALWARE Ducktail CnC Activity - Begin Download Command (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
pcre:"/^\x2f[a-z0-9]{96}$/";
urilen:97;
http.user_agent;
content:"WindowsPowerShell/";
http.content_type; bsize:16;
content:"application/json";
http.request_body;
content:"|5b|"; startswith;
content:"|22 5c 22|begin|20|download|20|http"; fast_pattern;
content:"|22 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 22 0d 0a 5d|"; endswith;
Raw source ET MALWARE Ducktail CnC Activity - Begin Download Command (POST) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Ducktail CnC Activity - Begin Download Command (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    pcre:"/^\x2f[a-z0-9]{96}$/";
    urilen:97;
    http.user_agent;
    content:"WindowsPowerShell/";
    http.content_type; bsize:16;
    content:"application/json";
    http.request_body;
    content:"|5b|"; startswith;
    content:"|22 5c 22|begin|20|download|20|http"; fast_pattern;
    content:"|22 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 22 0d 0a 5d|"; endswith;
    reference:md5,19df486249801c08f0efde6a16e135ee;
    reference:url,x.com/suyog41/status/1875174914128310378;
    classtype:command-and-control;
    sid:2058892; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_03, deployment Perimeter, confidence High, signature_severity Major, tag c2, tag Ducktail, updated_at 2025_01_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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