Explorer NOUACCHECK Flag

calendar Oct 23, 2025 · attack.privilege-escalation attack.defense-evasion attack.t1548.002  ·
Share on: linkedin copy

Detects suspicious starts of explorer.exe that use the /NOUACCHECK flag that allows to run all sub processes of that newly started explorer.exe without any UAC checks

Sigma rule (View on GitHub)

 1title: Explorer NOUACCHECK Flag
 2id: 534f2ef7-e8a2-4433-816d-c91bccde289b
 3status: test
 4description: Detects suspicious starts of explorer.exe that use the /NOUACCHECK flag that allows to run all sub processes of that newly started explorer.exe without any UAC checks
 5references:
 6    - https://twitter.com/ORCA6665/status/1496478087244095491
 7author: Florian Roth (Nextron Systems)
 8date: 2022-02-23
 9modified: 2022-04-21
10tags:
11    - attack.privilege-escalation
12    - attack.defense-evasion
13    - attack.t1548.002
14logsource:
15    category: process_creation
16    product: windows
17detection:
18    selection:
19        Image|endswith: '\explorer.exe'
20        CommandLine|contains: '/NOUACCHECK'
21    filter_dc_logon:
22        - ParentCommandLine: 'C:\Windows\system32\svchost.exe -k netsvcs -p -s Schedule'
23        - ParentImage: 'C:\Windows\System32\svchost.exe' # coarse filter needed for ID 4688 Events
24    condition: selection and not 1 of filter_*
25falsepositives:
26    - Domain Controller User Logon
27    - Unknown how many legitimate software products use that method
28level: high

References

  • Something went wrong, but don’t fret — let’s give it another shot. Some privacy related extensions may cause issues on x.com. Please disable them and try again.


    Read More

Related rules

to-top