title: FoggyWeb Backdoor DLL Loading
id: 640dc51c-7713-4faa-8a0e-e7c0d9d4654c
status: test
description: Detects DLL hijacking technique used by NOBELIUM in their FoggyWeb backdoor. Which loads a malicious version of the expected "version.dll" dll
references:
    - https://www.microsoft.com/security/blog/2021/09/27/foggyweb-targeted-nobelium-malware-leads-to-persistent-backdoor/
author: Florian Roth (Nextron Systems)
date: 2021-09-27
modified: 2022-12-09
tags:
    - attack.resource-development
    - attack.t1587
    - detection.emerging-threats
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded: 'C:\Windows\ADFS\version.dll'
    condition: selection
falsepositives:
    - Unlikely
level: critical