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Description

The following analytic leverages Windows Security EventCode 4698, A scheduled task was created and Windows Security EventCode 4699, A scheduled task was deleted to identify scheduled tasks created and deleted in less than 30 seconds. This behavior may represent a lateral movement attack abusing the Task Scheduler to obtain code execution. Red Teams and adversaries alike may abuse the Task Scheduler for lateral movement and remote code execution.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2021-12-03
  • Author: Mauricio Velazco, Splunk
  • ID: 6fa31414-546e-11ec-adfa-acde48001122

ATT&CK

ID Technique Tactic
T1053.005 Scheduled Task Execution, Persistence, Privilege Escalation
 `wineventlog_security` EventCode=4698 OR EventCode=4699 
| xmlkv Message 
| transaction Task_Name  startswith=(EventCode=4698) endswith=(EventCode=4699) 
| eval short_lived=case((duration<30),"TRUE") 
| search  short_lived = TRUE 
| table _time, ComputerName, Account_Name, Command, Task_Name, short_lived 
| `short_lived_scheduled_task_filter` 

Associated Analytic Story

How To Implement

To successfully implement this search, you need to be ingesting Windows Security Event Logs with 4698 EventCode enabled. The Windows TA is also required.

Required field

  • _time
  • dest
  • ComputerName
  • Account_Name
  • Task_Name
  • Description
  • Command

Kill Chain Phase

  • Lateral Movement

Known False Positives

Although uncommon, legitimate applications may create and delete a Scheduled Task within 30 seconds. Filter as needed.

RBA

Risk Score Impact Confidence Message
81.0 90 90 A windows scheduled task was created and deleted in 30 seconds on $ComputerName$

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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