Sigma rule: InstallerFileTakeOver LPE CVE-2021-41379 File Create Event

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-8b967c3bc005, updated 2022-12-25T00:00:00.000Z.

Rule

Title
InstallerFileTakeOver LPE CVE-2021-41379 File Create Event
Status
test
Level
critical
Author
Florian Roth (Nextron Systems)
Date
2021-11-22
Modified
2022-12-25
File
rules-emerging-threats/2021/Exploits/CVE-2021-41379/file_event_win_cve_2021_41379_msi_lpe.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects signs of the exploitation of LPE CVE-2021-41379 that include an msiexec process that creates an elevation_service.exe file

Log source

product
windows
category
file_event

Detection

selection:
    Image|endswith: '\msiexec.exe'
    TargetFilename|startswith: 'C:\Program Files (x86)\Microsoft\Edge\Application'
    TargetFilename|endswith: '\elevation_service.exe'
condition: selection

False positives (as the rule lists them)

  • Unknown
  • Possibly some Microsoft Edge upgrades

Tags

  • attack.privilege-escalation
  • attack.t1068
  • detection.emerging-threats

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-emerging-threats/2021/Exploits/CVE-2021-41379/file_event_win_cve_2021_41379_msi_lpe.yml

Sources and licences

  • SigmaHQ

    "InstallerFileTakeOver LPE CVE-2021-41379 File Create Event" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-41379/file_event_win_cve_2021_41379_msi_lpe.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: InstallerFileTakeOver LPE CVE-2021-41379 File Create Event",
entity page, dataset version ref-8b967c3bc005, updated 2022-12-25T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3be82d5d-09fe-4d6a-a275-0d40d234d324 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3be82d5d-09fe-4d6a-a275-0d40d234d324, 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.