sigmamediumHunting

Potential DLL Sideloading Of DBGCORE.DLL

Detects DLL sideloading of "dbgcore.dll"

MITRE ATT&CK

defense-evasionpersistenceprivilege-escalation

Detection Query

selection:
  ImageLoaded|endswith: \dbgcore.dll
filter_main_generic:
  ImageLoaded|startswith:
    - C:\Program Files (x86)\
    - C:\Program Files\
    - C:\Windows\SoftwareDistribution\
    - C:\Windows\System32\
    - C:\Windows\SystemTemp\
    - C:\Windows\SysWOW64\
    - C:\Windows\WinSxS\
filter_optional_steam:
  ImageLoaded|endswith: \Steam\bin\cef\cef.win7x64\dbgcore.dll
filter_optional_opera:
  ImageLoaded|contains: opera\Opera Installer Temp\opera_package
  ImageLoaded|endswith: \assistant\dbgcore.dll
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*

Author

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

Created

2022-10-25

Data Sources

windowsImage Load Events

Platforms

windows

References

https://hijacklibs.net/

Tags

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

Raw Content

title: Potential DLL Sideloading Of DBGCORE.DLL
id: 9ca2bf31-0570-44d8-a543-534c47c33ed7
status: test
description: Detects DLL sideloading of "dbgcore.dll"
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: 2022-10-25
modified: 2025-10-06
tags:
    - attack.defense-evasion
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith: '\dbgcore.dll'
    filter_main_generic:
        ImageLoaded|startswith:
            - 'C:\Program Files (x86)\'
            - 'C:\Program Files\'
            - 'C:\Windows\SoftwareDistribution\'
            - 'C:\Windows\System32\'
            - 'C:\Windows\SystemTemp\'
            - 'C:\Windows\SysWOW64\'
            - 'C:\Windows\WinSxS\'
    filter_optional_steam:
        ImageLoaded|endswith: '\Steam\bin\cef\cef.win7x64\dbgcore.dll'
    filter_optional_opera:
        # C:\\Users\\User\\AppData\\Local\\Temp\\.opera\\Opera Installer Temp\\opera_package_202311051506321\\assistant\\dbgcore.dll
        ImageLoaded|contains: 'opera\Opera Installer Temp\opera_package'
        ImageLoaded|endswith: '\assistant\dbgcore.dll'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Legitimate applications loading their own versions of the DLL mentioned in this rule
level: medium