System Scripts Autorun Keys Modification — Sigma Rule

Rule metadata and linked tags

Author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split). Source status: test; severity: medium. Source dates: 2019-10-25 / 2023-08-17.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2e45bbc3c3440d3439050c3dee2c3e9795308899c8a798ca05e0f61a00c0b72d

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: System Scripts Autorun Keys Modification
id: e7a2fd40-3ae1-4a85-bf80-15cf624fb1b1
related:
    - id: 17f878b8-9968-4578-b814-c4217fc5768c
      type: obsolete
status: test
description: Detects modification of autostart extensibility point (ASEP) in registry.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.001/T1547.001.md
    - https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns
    - https://gist.github.com/GlebSukhodolskiy/0fc5fa5f482903064b448890db1eaf9d # a list with registry keys
author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split)
date: 2019-10-25
modified: 2023-08-17
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1547.001
logsource:
    category: registry_set
    product: windows
detection:
    scripts_base:
        TargetObject|contains: '\Software\Policies\Microsoft\Windows\System\Scripts'
    scripts:
        TargetObject|contains:
            - '\Startup'
            - '\Shutdown'
            - '\Logon'
            - '\Logoff'
    filter:
        Details: '(Empty)'
    condition: scripts_base and scripts and not filter
falsepositives:
    - Legitimate software automatically (mostly, during installation) sets up autorun keys for legitimate reason
    - Legitimate administrator sets up autorun keys for legitimate reason
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate software automatically (mostly, during installation) sets up autorun keys for legitimate reason
• Legitimate administrator sets up autorun keys for legitimate reason

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.001/T1547.001.md
• https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns
• https://gist.github.com/GlebSukhodolskiy/0fc5fa5f482903064b448890db1eaf9d