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Newest: 2.0.2
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Active Rule
Potential CVE-2021-41379 Exploitation Attempt
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Potential CVE-2021-41379 Exploitation Attempt
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Potential CVE-2021-41379 Exploitation Attempt
id: af8bbce4-f751-46b4-8d91-82a33a736f61
status: test
description: Detects potential exploitation attempts of CVE-2021-41379 (InstallerFileTakeOver), a local privilege escalation (LPE) vulnerability where the attacker spawns a "cmd.exe" process as a child of Microsoft Edge elevation service "elevation_service" with "LOCAL_SYSTEM" rights
references:
- https://web.archive.org/web/20220421061949/https://github.com/klinix5/InstallerFileTakeOver
- https://www.bleepingcomputer.com/news/microsoft/new-windows-zero-day-with-public-exploit-lets-you-become-an-admin/
- https://www.zerodayinitiative.com/advisories/ZDI-21-1308/
- https://www.logpoint.com/en/blog/detecting-privilege-escalation-zero-day-cve-2021-41379/
author: Florian Roth (Nextron Systems)
date: 2021-11-22
modified: 2024-12-01
tags:
- attack.privilege-escalation
- attack.t1068
- cve.2021-41379
- detection.emerging-threats
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
- '\pwsh.exe'
- OriginalFileName:
- 'Cmd.Exe'
- 'PowerShell.EXE'
- 'pwsh.dll'
selection_parent:
ParentImage|endswith: '\elevation_service.exe'
IntegrityLevel:
- 'System'
- 'S-1-16-16384' # System
condition: all of selection_*
falsepositives:
- Unknown
level: critical
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules-emerging-threats/2021/Exploits/CVE-2021-41379/proc_creation_win_exploit_cve_2021_41379.yml