WinSxS Executable File Creation By Non-System Process

Description

Detects the creation of binaries in the WinSxS folder by non-system processes

Query · sigma

selection:
  TargetFilename|startswith: C:\Windows\WinSxS\
  TargetFilename|endswith: .exe
filter_main_system_location:
  Image|startswith:
  - C:\Windows\Systems32\
  - C:\Windows\SysWOW64\
  - C:\Windows\WinSxS\
condition: selection and not 1 of filter_main_*

Known false positives

  • Unknown
Raw source WinSxS Executable File Creation By Non-System Process · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: WinSxS Executable File Creation By Non-System Process
id: 34746e8c-5fb8-415a-b135-0abc167e912a
related:
    - id: 64827580-e4c3-4c64-97eb-c72325d45399
      type: derived
status: test
description: Detects the creation of binaries in the WinSxS folder by non-system processes
references:
    - https://media.defense.gov/2023/May/09/2003218554/-1/-1/0/JOINT_CSA_HUNTING_RU_INTEL_SNAKE_MALWARE_20230509.PDF
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-11
tags:
    - attack.execution
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|startswith: 'C:\Windows\WinSxS\'
        TargetFilename|endswith: '.exe'
    filter_main_system_location:
        Image|startswith:
            - 'C:\Windows\Systems32\'
            - 'C:\Windows\SysWOW64\'
            - 'C:\Windows\WinSxS\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

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