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Detection rules › Sigma

FoggyWeb Backdoor DLL Loading

Status
test
Severity
critical
Log source
product windows, category image_load
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects DLL hijacking technique used by NOBELIUM in their FoggyWeb backdoor. Which loads a malicious version of the expected "version.dll" dll

MITRE ATT&CK coverage

TacticTechniques
Resource DevelopmentT1587 Develop Capabilities

Event coverage

ProviderEventTitle
SysmonEvent ID 7Image loaded

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ImageLoaded: 'C:\Windows\ADFS\version.dll'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ImageLoadedeq
  • C:\Windows\ADFS\version.dll