Sigma rule: Access To Sysvol Policies Share By Uncommon Process

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1c28a072c627, updated 2023-12-21T00:00:00.000Z.

Rule

Title
Access To Sysvol Policies Share By Uncommon Process
Status
test
Level
medium
Author
frack113
Date
2023-12-21
File
rules-threat-hunting/windows/file/file_access/file_access_win_susp_gpo_access_uncommon_process.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects file access requests to the Windows Sysvol Policies Share by uncommon processes

Log source

product
windows
category
file_access
definition
Requirements: Microsoft-Windows-Kernel-File ETW provider

Detection

selection:
    FileName|startswith: '\\'
    FileName|contains|all:
        - '\sysvol\'
        - '\Policies\'
filter_main_generic:
    Image|contains:
        - ':\Program Files (x86)\'
        - ':\Program Files\'
        - ':\Windows\explorer.exe'
        - ':\Windows\system32\'
        - ':\Windows\SysWOW64\'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.credential-access
  • attack.t1552.006
  • detection.threat-hunting

MITRE ATT&CK ids this rule names

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-threat-hunting/windows/file/file_access/file_access_win_susp_gpo_access_uncommon_process.yml

Sources and licences

  • SigmaHQ

    "Access To Sysvol Policies Share By Uncommon Process" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-threat-hunting/windows/file/file_access/file_access_win_susp_gpo_access_uncommon_process.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 Sysvol Policies Share By Uncommon Process",
entity page, dataset version ref-1c28a072c627, updated 2023-12-21T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/8344c19f-a023-45ff-ad63-a01c5396aea0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 8344c19f-a023-45ff-ad63-a01c5396aea0, 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.