New TimeProviders Registered With Uncommon DLL Name — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2022-06-19 / 2024-03-26.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 499a423072b106e6043ab2cdea957829cbd2fb3603bd2c0a6e4ea905bd573b7c

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: New TimeProviders Registered With Uncommon DLL Name
id: e88a6ddc-74f7-463b-9b26-f69fc0d2ce85
status: test
description: |
    Detects processes setting a new DLL in DllName in under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProvider.
    Adversaries may abuse time providers to execute DLLs when the system boots.
    The Windows Time service (W32Time) enables time synchronization across and within domains.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.003/T1547.003.md
author: frack113
date: 2022-06-19
modified: 2024-03-26
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1547.003
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\Services\W32Time\TimeProviders'
        TargetObject|endswith: '\DllName'
    filter_main_w32time:
        Details:
            - '%SystemRoot%\System32\vmictimeprovider.dll'
            - '%systemroot%\system32\w32time.dll'
            - 'C:\Windows\SYSTEM32\w32time.DLL'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.003/T1547.003.md