38 lines
882 B
YAML
38 lines
882 B
YAML
|
|
title: Fax Service DLL Search Order Hijack
|
|
author: NVISO
|
|
date: 2020/05/04
|
|
description: The Fax service attempts to load ualapi.dll, which is non-existent. An
|
|
attacker can then (side)load their own malicious DLL using this service.
|
|
detection:
|
|
SELECTION_1:
|
|
EventID: 7
|
|
SELECTION_2:
|
|
Image:
|
|
- '*fxssvc.exe'
|
|
SELECTION_3:
|
|
ImageLoaded:
|
|
- '*ualapi.dll'
|
|
SELECTION_4:
|
|
ImageLoaded:
|
|
- C:\Windows\WinSxS\\*
|
|
condition: (SELECTION_1 and (SELECTION_2 and SELECTION_3) and not (SELECTION_4))
|
|
falsepositives:
|
|
- Unlikely
|
|
id: 828af599-4c53-4ed2-ba4a-a9f835c434ea
|
|
level: high
|
|
logsource:
|
|
category: image_load
|
|
product: windows
|
|
modified: 2020/08/23
|
|
references:
|
|
- https://windows-internals.com/faxing-your-way-to-system/
|
|
status: experimental
|
|
tags:
|
|
- attack.persistence
|
|
- attack.defense_evasion
|
|
- attack.t1073
|
|
- attack.t1038
|
|
- attack.t1574.001
|
|
- attack.t1574.002
|