sigmahighHunting

Suspicious Rundll32 Execution With Image Extension

Detects the execution of Rundll32.exe with DLL files masquerading as image files

MITRE ATT&CK

defense-evasion

Detection Query

selection_img:
  - Image|endswith: \rundll32.exe
  - OriginalFileName: RUNDLL32.exe
selection_cli:
  CommandLine|contains:
    - .bmp
    - .cr2
    - .eps
    - .gif
    - .ico
    - .jpeg
    - .jpg
    - .nef
    - .orf
    - .png
    - .raw
    - .sr2
    - .tif
    - .tiff
condition: all of selection_*

Author

Hieu Tran

Created

2023-03-13

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution

Tags

attack.defense-evasionattack.t1218.011

Raw Content

title: Suspicious Rundll32 Execution With Image Extension
id: 4aa6040b-3f28-44e3-a769-9208e5feb5ec
related:
    - id: 089fc3d2-71e8-4763-a8a5-c97fbb0a403e
      type: similar
status: test
description: Detects the execution of Rundll32.exe with DLL files masquerading as image files
references:
    - https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution
author: Hieu Tran
date: 2023-03-13
tags:
    - attack.defense-evasion
    - attack.t1218.011
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\rundll32.exe'
        - OriginalFileName: 'RUNDLL32.exe'
    selection_cli:
        CommandLine|contains:
            - '.bmp'
            - '.cr2'
            - '.eps'
            - '.gif'
            - '.ico'
            - '.jpeg'
            - '.jpg'
            - '.nef'
            - '.orf'
            - '.png'
            - '.raw'
            - '.sr2'
            - '.tif'
            - '.tiff'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high