> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/suspicious-runonce-parent-process.md).

# Suspicious RunOnce Parent Process

### Synopsis

| Field                | Value                                                                             |
| -------------------- | --------------------------------------------------------------------------------- |
| Activation Period    | 14 Days                                                                           |
| Training Period      | 30 Days                                                                           |
| Test Period          | N/A (single event)                                                                |
| Deduplication Period | 1 Day                                                                             |
| Required Data        | XDR Agent                                                                         |
| ATT\&CK Tactic       | Persistence (TA0003)                                                              |
| ATT\&CK Technique    | Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (T1547.001) |
| Severity             | Low                                                                               |

### Description

Runonce.exe executes commands under the Registry key HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce, typically on computer boot and user login events.

### Attacker's Goals

An attacker is trying to perform an action on the system at a later point, achieving persistence.

### Investigative actions

Investigate the endpoint to determine if it's a legitimate process that is supposed to use RunOnce in its operation.


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