Task Scheduler Operational Log

The TaskScheduler/Operational event log channel provides detailed tracing of scheduled tasks on an endpoint.

Analysis Value

pageCommand Line OptionspageFirst ExecutedpageLast ExecutedpageEvidence of ExecutionpageExecution TimestamppageFile PathpageSource Identification

Operating System Availability

Major VersionSupportMajor VersionSupport

Windows 11

Server 2019

Windows 10

Server 2016

Windows 8

Server 2012

Windows 7

Server 2008

Windows Vista

Server 2003

Windows XP

Artifact Location(s)

  • %SystemRoot%\System32\Winevt\Logs\Microsoft-Windows-TaskScheduler%4Operational.evtx

Artifact Interpretation

The following event IDs are useful to hunt for persistent implants on an endpoint:

Event IDDescriptionInformation


Scheduled Task Created

Origin Account/User


Scheduled Task Updated

Origin Account/User


Scheduled Task Deleted

Origin Account/User


Scheduled Task Executed

Executable file path


Scheduled Task Execution Completed

Executable file path

This activity is also logged in the Security channel with more granular information, as follows:

Event IDDescription


Scheduled Task Created


Scheduled Task Updated


Scheduled Task Deleted


Logging for these events is disabled by default and must be enabled to provide these artifacts.

Analysis Tips

Deleted Scheduled Tasks

Scheduled task deletion is a rare event on Windows systems and provides an easy to query, high-fidelity indicator of suspicious activity. The following event IDs may be queried:

  • Windows-TaskScheduler\Operational Event 141: Scheduled Task Deleted

  • Security Event 4699: Scheduled Task Deleted

Software Installation/Uninstallation

When applications are installed on a Windows system, they will sometimes create a scheduled task to run their update functionality, making the Task Scheduler Operational log a possible option for cross-validation of other application installation artifacts such as the Uninstall registry key.

Lateral Movement through Remote Scheduled Task Installation

In the event that tasks are remotely scheduled, as is commonly seen during lateral movement attempts, this activity may be identified by observing Type 3 logons via EventID 4624: An account was successfully logged on events in close proximity to task creation.

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