Detection rules › Sigma
InstallerFileTakeOver LPE CVE-2021-41379 File Create Event
Detects signs of the exploitation of LPE CVE-2021-41379 that include an msiexec process that creates an elevation_service.exe file
Known false positives
- Possibly some Microsoft Edge upgrades
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 11: FileCreate |
Rule body
title: InstallerFileTakeOver LPE CVE-2021-41379 File Create Event
id: 3be82d5d-09fe-4d6a-a275-0d40d234d324
status: test
description: Detects signs of the exploitation of LPE CVE-2021-41379 that include an msiexec process that creates an elevation_service.exe file
references:
- https://web.archive.org/web/20220421061949/https://github.com/klinix5/InstallerFileTakeOver
- https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
author: Florian Roth (Nextron Systems)
date: 2021-11-22
modified: 2022-12-25
tags:
- attack.privilege-escalation
- attack.t1068
- detection.emerging-threats
logsource:
category: file_event
product: windows
detection:
selection:
Image|endswith: '\msiexec.exe'
TargetFilename|startswith: 'C:\Program Files (x86)\Microsoft\Edge\Application'
TargetFilename|endswith: '\elevation_service.exe'
condition: selection
falsepositives:
- Unknown
- Possibly some Microsoft Edge upgrades
level: critical
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith: '\msiexec.exe'
TargetFilename|startswith: 'C:\Program Files (x86)\Microsoft\Edge\Application'
TargetFilename|endswith: '\elevation_service.exe'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Image | ends_with |
| field:"Image" kind:ends_with value:"\msiexec.exe" |
TargetFilename | ends_with |
| field:"TargetFilename" kind:ends_with value:"\elevation_service.exe" |
TargetFilename | starts_with |
| field:"TargetFilename" kind:starts_with value:"C:\Program Files (x86)\Microsoft\Edge\Application" |