Detection rules › Sigma

Scheduled Task Creation Via Schtasks.EXE

Status
test
Severity
low
Log source
product windows, category process_creation
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the creation of scheduled tasks by user accounts via the "schtasks" utility.

MITRE ATT&CK coverage

Event coverage

Rule body yaml

title: Scheduled Task Creation Via Schtasks.EXE
id: 92626ddd-662c-49e3-ac59-f6535f12d189
status: test
description: Detects the creation of scheduled tasks by user accounts via the "schtasks" utility.
references:
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/schtasks-create
author: Florian Roth (Nextron Systems)
date: 2019-01-16
modified: 2025-10-22
tags:
    - attack.execution
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1053.005
    - attack.s0111
    - car.2013-08-001
    - stp.1u
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\schtasks.exe'
        CommandLine|contains: ' /create '
    filter_main_system_user:
        User|contains: # covers many language settings
            - 'AUTHORI'
            - 'AUTORI'
    filter_optional_msoffice:
        #  schtasks.exe /Create /tn "Microsoft\Office\Office Performance Monitor" /XML "C:\ProgramData\Microsoft\ClickToRun\{9AC08E99-230B-47e8-9721-4577B7F124EA}\Microsoft_Office_Office Performance Monitor.xml"
        ParentImage:
            - 'C:\Program Files\Microsoft Office\root\integration\integrator.exe'
            - 'C:\Program Files (x86)\Microsoft Office\root\integration\integrator.exe'
        Image:
            - 'C:\Windows\System32\schtasks.exe'
            - 'C:\Windows\SysWOW64\schtasks.exe'
        CommandLine|contains: 'Microsoft\Office\Office Performance Monitor'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Administrative activity
    - Software installation
level: low

Stages and Predicates

Stage 0: condition

selection and not 1 of filter_main_* and not 1 of filter_optional_*

Stage 1: selection

selection:
    Image|endswith: '\schtasks.exe'
    CommandLine|contains: ' /create '

Stage 2: not filter_main_system_user

filter_main_system_user:
    User|contains:
        - 'AUTHORI'
        - 'AUTORI'

Stage 3: not filter_optional_msoffice

filter_optional_msoffice:
    ParentImage:
        - 'C:\Program Files\Microsoft Office\root\integration\integrator.exe'
        - 'C:\Program Files (x86)\Microsoft Office\root\integration\integrator.exe'
    Image:
        - 'C:\Windows\System32\schtasks.exe'
        - 'C:\Windows\SysWOW64\schtasks.exe'
    CommandLine|contains: 'Microsoft\Office\Office Performance Monitor'

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

FieldKindExcluded values
UsermatchAUTHORI
UsermatchAUTORI
ImageeqC:\Windows\SysWOW64\schtasks.exe
ImageeqC:\Windows\System32\schtasks.exe
ParentImageeqC:\Program Files (x86)\Microsoft Office\root\integration\integrator.exe
ParentImageeqC:\Program Files\Microsoft Office\root\integration\integrator.exe
CommandLinematchMicrosoft\Office\Office Performance Monitor

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
CommandLinematch
  • /create corpus 15 (sigma 15)
Imageends_with
  • \schtasks.exe corpus 56 (sigma 56)