Run Once Task Configuration in Registry — Sigma Rule

Rule metadata and linked tags

Author: Avneet Singh @v3t0_, oscd.community. Source status: test; severity: medium. Source dates: 2020-11-15 / 2024-03-25.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 5348034c2383b4c089ed504254b4eb72c878dc844263d0a79ffc4b3f7133c9fc

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: Run Once Task Configuration in Registry
id: c74d7efc-8826-45d9-b8bb-f04fac9e4eff
status: test
description: Rule to detect the configuration of Run Once registry key. Configured payload can be run by runonce.exe /AlternateShellStartup
references:
    - https://twitter.com/pabraeken/status/990717080805789697
    - https://lolbas-project.github.io/lolbas/Binaries/Runonce/
author: 'Avneet Singh @v3t0_, oscd.community'
date: 2020-11-15
modified: 2024-03-25
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1112
logsource:
    product: windows
    category: registry_event
detection:
    selection:
        TargetObject|contains: '\Microsoft\Active Setup\Installed Components'
        TargetObject|endswith: '\StubPath'
    filter_optional_chrome:
        Details|contains|all:
            - 'C:\Program Files\Google\Chrome\Application\'
            - '\Installer\chrmstp.exe" --configure-user-settings --verbose-logging --system-level' # In some cases the Details will contain an additional flag called "--channel=stable" at the end
    filter_optional_edge:
        Details|contains:
            - 'C:\Program Files (x86)\Microsoft\Edge\Application\'
            - 'C:\Program Files\Microsoft\Edge\Application\'
        Details|endswith: '\Installer\setup.exe" --configure-user-settings --verbose-logging --system-level --msedge --channel=stable'
    condition: selection and not 1 of filter_optional_*
falsepositives:
    - Legitimate modification of the registry key by legitimate program
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate modification of the registry key by legitimate program

Source references

• https://twitter.com/pabraeken/status/990717080805789697
• https://lolbas-project.github.io/lolbas/Binaries/Runonce/