Sigma rule: Access To Potentially Sensitive Sysvol Files By Uncommon Applications

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-0a437b137c24, updated 2024-07-29T00:00:00.000Z.

Rule

Title
Access To Potentially Sensitive Sysvol Files By Uncommon Applications
Status
test
Level
medium
Author
frack113
Date
2023-12-21
Modified
2024-07-29
File
rules/windows/file/file_access/file_access_win_susp_gpo_files.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product
windows
category
file_access
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_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.credential-access
  • attack.t1552.006

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_access/file_access_win_susp_gpo_files.yml

Sources and licences

  • SigmaHQ

    "Access To Potentially Sensitive Sysvol Files By Uncommon Applications" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_access/file_access_win_susp_gpo_files.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Access To Potentially Sensitive Sysvol Files By Uncommon Applications",
entity page, dataset version ref-0a437b137c24, updated 2024-07-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/d51694fe-484a-46ac-92d6-969e76d60d10 (accessed 2026-11-03).
Underlying source: SigmaHQ rule d51694fe-484a-46ac-92d6-969e76d60d10, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.