schtasks.exe

logsource:
  category: process_creation
  product: windows
detection:
  selection:
    - Image|endswith: '\schtasks.exe'
    - OriginalFileName:
        - 'schtasks.exe'
        - 'sctasks.exe'
  condition: selection

| tstats summariesonly=false count values(Processes.original_file_name) as original_file_name
    from datamodel=Endpoint.Processes
    where (Processes.original_file_name="schtasks.exe" OR Processes.original_file_name="sctasks.exe" OR Processes.process_name="schtasks.exe")
    by Processes.dest Processes.process_name Processes.process_path Processes.process
| rename Processes.* as *

DeviceProcessEvents
| where ProcessVersionInfoOriginalFileName in~ ("schtasks.exe", "sctasks.exe")
    or FileName =~ "schtasks.exe"

process where event.type == "start" and
  (process.pe.original_file_name in~ ("schtasks.exe", "sctasks.exe") or
   process.name : "schtasks.exe")

['schtasks.exe', 'sctasks.exe'].includes(String(OriginalFileName || '').toLowerCase())