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Access To Potentially Sensitive Sysvol Files By Uncommon Applications

Detects file access requests to potentially sensitive files hosted on the Windows Sysvol share.

MITRE ATT&CK

credential-access

Detection Query

selection:
  FileName|startswith: \\
  FileName|contains|all:
    - \sysvol\
    - \Policies\
  FileName|endswith:
    - audit.csv
    - Files.xml
    - GptTmpl.inf
    - groups.xml
    - Registry.pol
    - Registry.xml
    - scheduledtasks.xml
    - scripts.ini
    - services.xml
filter_main_generic:
  Image|startswith:
    - C:\Program Files (x86)\
    - C:\Program Files\
    - C:\Windows\system32\
    - C:\Windows\SysWOW64\
filter_main_explorer:
  Image: C:\Windows\explorer.exe
condition: selection and not 1 of filter_main_*

Author

frack113

Created

2023-12-21

Data Sources

windowsfile_access

Platforms

windows

References

https://github.com/vletoux/pingcastle

Tags

attack.credential-accessattack.t1552.006

Raw Content

title: Access To Potentially Sensitive Sysvol Files By Uncommon Applications
id: d51694fe-484a-46ac-92d6-969e76d60d10
related:
    - id: 8344c19f-a023-45ff-ad63-a01c5396aea0
      type: derived
status: test
description: Detects file access requests to potentially sensitive files hosted on the Windows Sysvol share.
references:
    - https://github.com/vletoux/pingcastle
author: frack113
date: 2023-12-21
modified: 2024-07-29
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: file_access
    product: windows
    definition: 'Requirements: Microsoft-Windows-Kernel-File ETW provider'
detection:
    selection:
        FileName|startswith: '\\'
        FileName|contains|all:
            - '\sysvol\'
            - '\Policies\'
        FileName|endswith:
            - 'audit.csv'
            - 'Files.xml'
            - 'GptTmpl.inf'
            - 'groups.xml'
            - 'Registry.pol'
            - 'Registry.xml'
            - 'scheduledtasks.xml'
            - 'scripts.ini'
            - 'services.xml'
    filter_main_generic:
        Image|startswith:
            - 'C:\Program Files (x86)\'
            - 'C:\Program Files\'
            - 'C:\Windows\system32\'
            - 'C:\Windows\SysWOW64\'
    filter_main_explorer:
        Image: 'C:\Windows\explorer.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium