Potential Persistence Via Logon Scripts - Registry — Sigma Rule

Rule metadata and linked tags

Author: Tom Ueltschi (@c_APT_ure). Source status: test; severity: medium. Source dates: 2019-01-12 / 2025-10-26.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 28c8b5e8fd3c0237fd18e74202628c9ad7363a4dc2599267a7f43676cc4fc615

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: Potential Persistence Via Logon Scripts - Registry
id: 9ace0707-b560-49b8-b6ca-5148b42f39fb
status: test
description: Detects creation of "UserInitMprLogonScript" registry value which can be used as a persistence method by malicious actors
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1037.001/T1037.001.md
author: Tom Ueltschi (@c_APT_ure)
date: 2019-01-12
modified: 2025-10-26
tags:
    - attack.privilege-escalation
    - attack.t1037.001
    - attack.persistence
    - attack.lateral-movement
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: 'UserInitMprLogonScript'
    condition: selection
falsepositives:
    - Investigate the contents of the "UserInitMprLogonScript" value to determine of the added script is legitimate
level: medium
regression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_persistence_logon_scripts_userinitmprlogonscript/info.yml
simulation:
    - type: atomic-red-team
      name: Logon Scripts
      technique: T1037.001
      atomic_guid: d6042746-07d4-4c92-9ad8-e644c114a231

Original YAML and metadata in JSON

False positives

• Investigate the contents of the "UserInitMprLogonScript" value to determine of the added script is legitimate

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1037.001/T1037.001.md