sigmamediumHunting

Third Party Software DLL Sideloading

Detects DLL sideloading of DLLs that are part of third party software (zoom, discord....etc)

MITRE ATT&CK

defense-evasionpersistenceprivilege-escalation

Detection Query

selection_lenovo:
  ImageLoaded|endswith: \commfunc.dll
filter_lenovo:
  - ImageLoaded|contains: \AppData\local\Google\Chrome\Application\
  - ImageLoaded|startswith:
      - C:\Program Files\Lenovo\Communications Utility\
      - C:\Program Files (x86)\Lenovo\Communications Utility\
selection_toshiba:
  ImageLoaded|endswith: \tosbtkbd.dll
filter_toshiba:
  ImageLoaded|startswith:
    - C:\Program Files\Toshiba\Bluetooth Toshiba Stack\
    - C:\Program Files (x86)\Toshiba\Bluetooth Toshiba Stack\
condition: (selection_lenovo and not filter_lenovo) or (selection_toshiba and
  not filter_toshiba)

Author

Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)

Created

2022-08-17

Data Sources

windowsImage Load Events

Platforms

windows

References

https://hijacklibs.net/

Tags

attack.defense-evasionattack.persistenceattack.privilege-escalationattack.t1574.001

Raw Content

title: Third Party Software DLL Sideloading
id: f9df325d-d7bc-4a32-8a1a-2cc61dcefc63
status: test
description: Detects DLL sideloading of DLLs that are part of third party software (zoom, discord....etc)
references:
    - https://hijacklibs.net/ # For list of DLLs that could be sideloaded (search for dlls mentioned here in there)
author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)
date: 2022-08-17
tags:
    - attack.defense-evasion
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    # Lenovo
    selection_lenovo:
        ImageLoaded|endswith: '\commfunc.dll'
    filter_lenovo:
        - ImageLoaded|contains: '\AppData\local\Google\Chrome\Application\'
        - ImageLoaded|startswith:
              - 'C:\Program Files\Lenovo\Communications Utility\'
              - 'C:\Program Files (x86)\Lenovo\Communications Utility\'
    # Toshiba
    selection_toshiba:
        ImageLoaded|endswith: '\tosbtkbd.dll'
    filter_toshiba:
        ImageLoaded|startswith:
            - 'C:\Program Files\Toshiba\Bluetooth Toshiba Stack\'
            - 'C:\Program Files (x86)\Toshiba\Bluetooth Toshiba Stack\'
    # Zoom (FP with System32)
    # selection_zoom:
    #     ImageLoaded|endswith: '\version.dll'
    # filter_zoom:
    #     ImageLoaded|startswith: 'C:\Users\'
    #     ImageLoaded|contains: '\AppData\Roaming\Zoom\bin\'
    condition: (selection_lenovo and not filter_lenovo) or (selection_toshiba and not filter_toshiba)
falsepositives:
    - Unknown
level: medium