Temporarily Scheduled Task Creation

Elastic Stack Serverless Security

Indicates the creation and deletion of a scheduled task within a short time interval. Adversaries can use these to proxy malicious execution via the schedule service and perform clean up.

Rule type: eql

Rule indices:

• winlogbeat-*
• logs-system.*
• logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4698

Tags:

• Elastic
• Host
• Windows
• Threat Detection
• Persistence

Version: 3

Rule authors:

• Elastic

Rule license: Elastic License v2

sequence by winlog.computer_name, winlog.event_data.TaskName with maxspan=5m
   [iam where event.action == "scheduled-task-created" and not user.name : "*$"]
   [iam where event.action == "scheduled-task-deleted" and not user.name : "*$"]

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Persistence
  • ID: TA0003
  • Reference URL: https://attack.mitre.org/tactics/TA0003/

• Technique:

  • Name: Scheduled Task/Job
  • ID: T1053
  • Reference URL: https://attack.mitre.org/techniques/T1053/

• Sub-technique:

  • Name: Scheduled Task
  • ID: T1053.005
  • Reference URL: https://attack.mitre.org/techniques/T1053/005/