TaskScheduler/Operational.evtx

C:\Windows\System32\winevt\Logs\Microsoft-Windows-TaskScheduler%4Operational.evtx

Checking raw Task Scheduler XML files shows you the blueprint - watching this log shows you the building being constructed and used. It records exactly when a task was registered, modified, deleted and when it actually fired, providing a precise execution timeline that static artifact analysis simply cannot deliver.

Log Channel Microsoft-Windows-TaskScheduler/Operational - written by the Task Scheduler service (Schedule)

Trace Type Persistence Execution Scheduled Activity

Req. Audit Policy No Active by default. The TaskScheduler Operational channel is enabled without additional configuration.

User Specific No System-wide. Captures all scheduled task activity regardless of the user account that registered or triggered the task.

General

The TaskScheduler Operational log is written by the Windows Task Scheduler service and provides a granular execution audit trail for every task on the system. Unlike the static XML task definitions in C:\Windows\System32\Tasks, this log tells you what actually happened at runtime - when the trigger fired, whether the action succeeded and what error codes were returned on failure. This matters enormously in investigations where an attacker has registered a task, let it run and then deleted it: the Operational log retains the execution record even after the task XML is gone.

Traces

The most forensically significant Event IDs in the TaskScheduler Operational log are:

Event ID	Description
106	Task registered. Records the task name, path and the user identity that created it. The primary indicator of new persistence being established.
140	Task updated. An attacker may hijack a legitimate task and modify its action to also execute a malicious payload alongside the original one.
141	Task deleted. Documents the removal of a task - useful for confirming that an attacker cleaned up a persistence mechanism after use.
200	Task action started. Confirms that the scheduled binary or script actually launched. Contains the task name and the exact action path.
201	Task action completed. Records the result code of the executed action - a non-zero return value can reveal execution failures or errors in the payload.

Forensic Value

Prove that a persistence mechanism actually ran: Event ID 200 confirms a task action fired. This is critical for tasks already deleted from Scheduled Tasks.
Detect task hijacking: A 140 (task updated) event on a legitimate task followed by an unexpected binary path is a strong indicator of persistence via modification.
Attribute task creation to a user: Event ID 106 records the creating user identity, allowing you to attribute persistence to a specific account.
Map the full persistence lifecycle: Chain 106 (created), 200/201 (ran) and 141 (deleted) events to reconstruct the complete operational timeline.

For more Info check out these Articles: Scheduled Tasks