Suspicious runonce.exe parent process

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	6 Hours
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 logon events.

Attacker's Goals

Command execution and persistence on the host.

Investigative actions

Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.