ET MALWARE AutoIt3 Script Downloaded via Powershell Shortly After AutoIt3.exe Download

Query · suricata

flow:established,to_server;
flowbits:isset,ET.AutoItDownload;
http.method;
content:"GET";
http.uri;
content:".au3"; endswith;
http.user_agent;
content:"WindowsPowerShell/"; fast_pattern;
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 AutoIt3 Script Downloaded via Powershell Shortly After AutoIt3.exe Download · 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 AutoIt3 Script Downloaded via Powershell Shortly After AutoIt3.exe Download";
    flow:established,to_server;
    flowbits:isset,ET.AutoItDownload;
    http.method;
    content:"GET";
    http.uri;
    content:".au3"; endswith;
    http.user_agent;
    content:"WindowsPowerShell/"; fast_pattern;
    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:2052524; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2024_05_09, deployment Perimeter, confidence High, signature_severity Major, 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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