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WinSxS Executable File Creation By Non-System Process

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

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Rule sourcerules/windows/file/file_event/file_event_win_susp_winsxs_binary_creation.yml

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