DarkGate - Drop DarkGate Loader In C:\Temp Directory

SIGMA detection rule by Tomasz Dyduch, Josh Nickels · NOASSERTION

Detects attackers attempting to save, decrypt and execute the DarkGate Loader in C:\temp folder.

title: DarkGate - Drop DarkGate Loader In C:\Temp Directory
id: df49c691-8026-48dd-94d3-4ba6a79102a8
status: test
description: Detects attackers attempting to save, decrypt and execute the DarkGate Loader in C:\temp folder.
references:
    - https://www.bleepingcomputer.com/news/security/hackers-exploit-windows-smartscreen-flaw-to-drop-darkgate-malware/
    - https://www.trendmicro.com/en_us/research/24/c/cve-2024-21412--darkgate-operators-exploit-microsoft-windows-sma.html
author: Tomasz Dyduch, Josh Nickels
date: 2024-05-31
tags:
    - attack.execution
    - attack.t1059
    - detection.emerging-threats
logsource:
    category: file_event
    product: windows
detection:
    selection_filename_suffix:
        TargetFilename|contains: ':\temp\'
        TargetFilename|endswith:
            - '.au3'
            - '\autoit3.exe'
    selection_image_suffix:
        Image|contains: ':\temp\'
        Image|endswith:
            - '.au3'
            - '\autoit3.exe'
    condition: 1 of selection_*
falsepositives:
    - Unlikely legitimate usage of AutoIT in temp folders.
level: medium

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

588e713a-0fca-4733-8d7e-2fe3e8668a8e

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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