Windows: Suspicious explorer.exe Child Process Spawned by RazerInstaller.exe

title: "Windows: Suspicious explorer.exe Child Process Spawned by RazerInstaller.exe"
id: f3e04317-b83a-4c09-914e-a84dd9b89624
status: test
description: This rule flags the creation of an explorer.exe subprocess when the parent process is RazerInstaller.exe and the parent runs with System integrity. Such subprocess spawning from an installer may be abused to perform actions under elevated context, which attackers can leverage during privilege escalation or defense-impairment. It relies on Windows process creation telemetry, including parent image paths, child image paths, and integrity level values.
references:
  - https://twitter.com/j0nh4t/status/1429049506021138437
  - https://streamable.com/q2dsji
  - https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2021/Exploits/RazerInstaller-LPE-Exploit/proc_creation_win_exploit_other_razorinstaller_lpe.yml
author: Florian Roth (Nextron Systems), Maxime Thiebaut, Huntrule Team
date: 2021-08-23
modified: 2024-12-01
tags:
  - attack.privilege-escalation
  - attack.defense-impairment
  - attack.t1553
  - detection.emerging-threats
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    ParentImage|endswith: \RazerInstaller.exe
    IntegrityLevel:
      - System
      - S-1-16-16384
  filter_main_razer:
    Image|startswith: C:\Windows\Installer\Razer\Installer\
  condition: selection and not 1 of filter_main_*
falsepositives:
  - User selecting a different installation folder (check for other sub processes of this explorer.exe process)
level: high
license: DRL-1.1
related:
  - id: a4eaf250-7dc1-4842-862a-5e71cd59a167
    type: derived