ET MALWARE DarkGate CnC Exfil via AutoIt Payload

Query · suricata

flow:established,to_server;
flowbits:isset,ET.AutoItDownload;
urilen:15;
http.method;
content:"GET";
http.uri;
content:"/screenshot.png"; fast_pattern;
http.user_agent;
content:"WindowsPowerShell/";
http.header_names;
content:!"|0d 0a|Referer|0d 0a|"; nocase;
threshold:type limit, count 1, seconds 300, track by_src;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE DarkGate CnC Exfil via AutoIt Payload · 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 DarkGate CnC Exfil via AutoIt Payload";
    flow:established,to_server;
    flowbits:isset,ET.AutoItDownload;
    urilen:15;
    http.method;
    content:"GET";
    http.uri;
    content:"/screenshot.png"; fast_pattern;
    http.user_agent;
    content:"WindowsPowerShell/";
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|"; nocase;
    threshold:type limit, count 1, seconds 300, track by_src;
    reference:md5,0286120018b92f5827ff9ad84696e7b3;
    classtype:misc-activity;
    sid:2052525; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_05_09, deployment Perimeter, malware_family DarkGate, confidence High, signature_severity Critical, tag c2, updated_at 2024_05_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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