sigmahighHunting

UAC Bypass Using NTFS Reparse Point - Process

Detects the pattern of UAC Bypass using NTFS reparse point and wusa.exe DLL hijacking (UACMe 36)

MITRE ATT&CK

defense-evasionprivilege-escalation

Detection Query

selection1:
  CommandLine|startswith: '"C:\Windows\system32\wusa.exe"  /quiet C:\Users\'
  CommandLine|endswith: \AppData\Local\Temp\update.msu
  IntegrityLevel:
    - High
    - System
    - S-1-16-16384
    - S-1-16-12288
selection2:
  ParentCommandLine: '"C:\Windows\system32\dism.exe" /online /quiet /norestart
    /add-package /packagepath:"C:\Windows\system32\pe386" /ignorecheck'
  IntegrityLevel:
    - High
    - System
  CommandLine|contains|all:
    - C:\Users\
    - \AppData\Local\Temp\
    - \dismhost.exe {
  Image|endswith: \DismHost.exe
condition: 1 of selection*

Author

Christian Burkard (Nextron Systems)

Created

2021-08-30

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://github.com/hfiref0x/UACME

Tags

attack.defense-evasionattack.privilege-escalationattack.t1548.002

Raw Content

title: UAC Bypass Using NTFS Reparse Point - Process
id: 39ed3c80-e6a1-431b-9df3-911ac53d08a7
status: test
description: Detects the pattern of UAC Bypass using NTFS reparse point and wusa.exe DLL hijacking (UACMe 36)
references:
    - https://github.com/hfiref0x/UACME
author: Christian Burkard (Nextron Systems)
date: 2021-08-30
modified: 2024-12-01
tags:
    - attack.defense-evasion
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: process_creation
    product: windows
detection:
    selection1:
        CommandLine|startswith: '"C:\Windows\system32\wusa.exe"  /quiet C:\Users\'
        CommandLine|endswith: '\AppData\Local\Temp\update.msu'
        IntegrityLevel:
            - 'High'
            - 'System'
            - 'S-1-16-16384' # System
            - 'S-1-16-12288' # High
    selection2:
        ParentCommandLine: '"C:\Windows\system32\dism.exe" /online /quiet /norestart /add-package /packagepath:"C:\Windows\system32\pe386" /ignorecheck'
        IntegrityLevel:
            - 'High'
            - 'System'
        CommandLine|contains|all:
            - 'C:\Users\'
            - '\AppData\Local\Temp\'
            - '\dismhost.exe {'
        Image|endswith: '\DismHost.exe'
    condition: 1 of selection*
falsepositives:
    - Unknown
level: high