EXPLORE
Sign In
← Back to Explore
sigmamediumHunting

Potential Mpclient.DLL Sideloading Via OfflineScannerShell.EXE Execution

Detects execution of Windows Defender "OfflineScannerShell.exe" from its non standard directory. The "OfflineScannerShell.exe" binary is vulnerable to DLL side loading and will load any DLL named "mpclient.dll" from the current working directory.

MITRE ATT&CK

T1218
defense-evasion

Detection Query

selection:
  - Image|endswith: \OfflineScannerShell.exe
  - OriginalFileName: OfflineScannerShell.exe
filter_main_legit_dir:
  CurrentDirectory: C:\Program Files\Windows Defender\Offline\
filter_main_empty:
  CurrentDirectory: ""
filter_main_null:
  CurrentDirectory: null
condition: selection and not 1 of filter_main_*

Author

frack113

Created

2022-03-06

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1218
Raw Content
title: Potential Mpclient.DLL Sideloading Via OfflineScannerShell.EXE Execution
id: 02b18447-ea83-4b1b-8805-714a8a34546a
status: test
description: |
    Detects execution of Windows Defender "OfflineScannerShell.exe" from its non standard directory.
    The "OfflineScannerShell.exe" binary is vulnerable to DLL side loading and will load any DLL named "mpclient.dll" from the current working directory.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/OfflineScannerShell/
author: frack113
date: 2022-03-06
modified: 2023-08-03
tags:
    - attack.defense-evasion
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\OfflineScannerShell.exe'
        - OriginalFileName: 'OfflineScannerShell.exe'
    filter_main_legit_dir:
        CurrentDirectory: 'C:\Program Files\Windows Defender\Offline\'
    filter_main_empty:
        CurrentDirectory: ''
    filter_main_null:
        CurrentDirectory: null
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium