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Detection rules › Sigma

Scheduled Task Executed From A Suspicious Location

Status
test
Severity
medium
Log source
product windows, service taskscheduler
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the execution of Scheduled Tasks where the Program being run is located in a suspicious location or it's an unusale program to be run from a Scheduled Task

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1053.005 Scheduled Task/Job: Scheduled Task
PersistenceT1053.005 Scheduled Task/Job: Scheduled Task
Privilege EscalationT1053.005 Scheduled Task/Job: Scheduled Task

Event coverage

ProviderEventTitle
TaskSchedulerEvent ID 129Task Scheduler launch task "Name" , instance "TaskName" with process ID Path.

Rule body yaml

title: Scheduled Task Executed From A Suspicious Location
id: 424273ea-7cf8-43a6-b712-375f925e481f
status: test
description: Detects the execution of Scheduled Tasks where the Program being run is located in a suspicious location or it's an unusale program to be run from a Scheduled Task
references:
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-05
modified: 2023-02-07
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.persistence
    - attack.t1053.005
logsource:
    product: windows
    service: taskscheduler
    definition: 'Requirements: The "Microsoft-Windows-TaskScheduler/Operational" is disabled by default and needs to be enabled in order for this detection to trigger'
detection:
    selection:
        EventID: 129 # Created Task Process
        Path|contains:
            - 'C:\Windows\Temp\'
            - '\AppData\Local\Temp\'
            - '\Desktop\'
            - '\Downloads\'
            - '\Users\Public\'
            - 'C:\Temp\'
    # If you experience FP. Uncomment the filter below and add the specific TaskName with the Program to it
    # filter:
    #     TaskName: '\Exact\Task\Name'
    #     Path: 'Exact\Path'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 129
    Path|contains:
        - 'C:\Windows\Temp\'
        - '\AppData\Local\Temp\'
        - '\Desktop\'
        - '\Downloads\'
        - '\Users\Public\'
        - 'C:\Temp\'

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
Pathmatch
  • C:\Temp\
  • C:\Windows\Temp\
  • \AppData\Local\Temp\
  • \Desktop\ corpus 2 (sigma 2)
  • \Downloads\ corpus 2 (sigma 2)
  • \Users\Public\