Find sigma rule 
Attack: Scheduled Task/Job: Scheduled Task
Adversaries may abuse the Windows Task Scheduler to perform task scheduling for initial or recurring execution of malicious code. There are multiple ways to access the Task Scheduler in Windows. The schtasks utility can be run directly on the command line, or the Task Scheduler can be opened through the GUI within the Administrator Tools section of the Control Panel. In some cases, adversaries have used a .NET wrapper for the Windows Task Scheduler, and alternatively, adversaries have used the Windows netapi32 library to create a scheduled task.
The deprecated at utility could also be abused by adversaries (ex: At), though at.exe can not access tasks created with schtasks or the Control Panel.
An adversary may use Windows Task Scheduler to execute programs at system startup or on a scheduled basis for persistence. The Windows Task Scheduler can also be abused to conduct remote Execution as part of Lateral Movement and/or to run a process under the context of a specified account (such as SYSTEM). Similar to System Binary Proxy Execution, adversaries have also abused the Windows Task Scheduler to potentially mask one-time execution under signed/trusted system processes.(Citation: ProofPoint Serpent)
Adversaries may also create “hidden” scheduled tasks (i.e. Hide Artifacts) that may not be visible to defender tools and manual queries used to enumerate tasks. Specifically, an adversary may hide a task from schtasks /query and the Task Scheduler by deleting the associated Security Descriptor (SD) registry value (where deletion of this value must be completed using SYSTEM permissions).(Citation: SigmaHQ)(Citation: Tarrask scheduled task) Adversaries may also employ alternate methods to hide tasks, such as altering the metadata (e.g., Index value) within associated registry keys.(Citation: Defending Against Scheduled Task Attacks in Windows Environments)
MITRE
Tactic
- execution
- persistence
- privilege-escalation
technique
- T1053.005
Test : Scheduled Task (“Ghost Task”) via Registry Key Manipulation
OS
- windows
Description:
Create a scheduled task through manipulation of registry keys. This procedure is implemented using the GhostTask utility. By manipulating registry keys under HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree, the tool creates user-specified scheduled tasks without a corresponding Windows Event 4698, which is logged when scheduled tasks are created through conventional means. This requires a download of the GhostTask binary, which must be run as NT Authority\SYSTEM. Upon successful execution of this test, a scheduled task will be set to run at logon which launches notepad.exe or runs a user-specified command. For further exploration of this procedure and guidance for hunting and detection, see Hunting G-G-G-GhostTasks!.
Executor
command_prompt