Sigma rule: UAC Bypass Using NTFS Reparse Point - File

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5ac652f6d9b7, updated 2022-10-09T00:00:00.000Z.

Rule

Title
UAC Bypass Using NTFS Reparse Point - File
Status
test
Level
high
Author
Christian Burkard (Nextron Systems)
Date
2021-08-30
Modified
2022-10-09
File
rules/windows/file/file_event/file_event_win_uac_bypass_ntfs_reparse_point.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product
windows
category
file_event

Detection

selection:
    TargetFilename|startswith: 'C:\Users\'
    TargetFilename|endswith: '\AppData\Local\Temp\api-ms-win-core-kernel32-legacy-l1.DLL'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.privilege-escalation
  • attack.t1548.002

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_event/file_event_win_uac_bypass_ntfs_reparse_point.yml

Sources and licences

  • SigmaHQ

    "UAC Bypass Using NTFS Reparse Point - File" by Christian Burkard (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_event/file_event_win_uac_bypass_ntfs_reparse_point.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: UAC Bypass Using NTFS Reparse Point - File",
entity page, dataset version ref-5ac652f6d9b7, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/7fff6773-2baa-46de-a24a-b6eec1aba2d1 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 7fff6773-2baa-46de-a24a-b6eec1aba2d1, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.