sigmahighHunting

Shell32 DLL Execution in Suspicious Directory

Detects shell32.dll executing a DLL in a suspicious directory

MITRE ATT&CK

defense-evasionexecution

Detection Query

selection_img:
  - Image|endswith: \rundll32.exe
  - OriginalFileName: RUNDLL32.EXE
selection_cli:
  CommandLine|contains|all:
    - shell32.dll
    - Control_RunDLL
  CommandLine|contains:
    - "%AppData%"
    - "%LocalAppData%"
    - "%Temp%"
    - "%tmp%"
    - \AppData\
    - \Temp\
    - \Users\Public\
condition: all of selection_*

Author

Christian Burkard (Nextron Systems)

Created

2021-11-24

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://www.group-ib.com/resources/threat-research/red-curl-2.html

Tags

attack.defense-evasionattack.executionattack.t1218.011

Raw Content

title: Shell32 DLL Execution in Suspicious Directory
id: 32b96012-7892-429e-b26c-ac2bf46066ff
status: test
description: Detects shell32.dll executing a DLL in a suspicious directory
references:
    - https://www.group-ib.com/resources/threat-research/red-curl-2.html
author: Christian Burkard (Nextron Systems)
date: 2021-11-24
modified: 2023-02-09
tags:
    - attack.defense-evasion
    - attack.execution
    - attack.t1218.011
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\rundll32.exe'
        - OriginalFileName: 'RUNDLL32.EXE'
    selection_cli:
        CommandLine|contains|all:
            - 'shell32.dll'
            - 'Control_RunDLL'
        CommandLine|contains:
            - '%AppData%'
            - '%LocalAppData%'
            - '%Temp%'
            - '%tmp%'
            - '\AppData\'
            - '\Temp\'
            - '\Users\Public\'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high