splunk-security_content/docs/_posts/2021-05-07-schtasks_run_task_on_demand.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
Schtasks Run Task On Demand	Scheduled Task/Job	Endpoint	2021-05-07	true		Scheduled Task/Job Execution Persistence Privilege Escalation Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This analytic identifies an on demand run of a Windows Schedule Task through shell or command-line. This technique has been used by adversaries that force to run their created Schedule Task as their persistence mechanism or for lateral movement as part of their malicious attack to the compromised machine.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-05-07
• Author: Teoderick Contreras, Splunk
• ID: bb37061e-af1f-11eb-a159-acde48001122

ATT&CK

ID	Technique	Tactic
T1053	Scheduled Task/Job	Execution, Persistence, Privilege Escalation

Search

| tstats `security_content_summariesonly` values(Processes.process) as process values(Processes.process_id) as process_id count min(_time) as firstTime max(_time) as lastTime  from datamodel=Endpoint.Processes where Processes.process_name = "schtasks.exe" Processes.process = "*/run*" by Processes.process_name Processes.parent_process_name Processes.dest Processes.user 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `schtasks_run_task_on_demand_filter`

Associated Analytic Story

• XMRig

How To Implement

To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. Tune and filter known instances where renamed schtasks.exe may be used.

Required field

• _time
• Processes.process
• Processes.process_id
• Processes.process_name
• Processes.parent_process_name
• Processes.dest
• Processes.user

Kill Chain Phase

• Exploitation

Known False Positives

Administrators may use to debug Schedule Task entries. Filter as needed.

RBA

Risk Score	Impact	Confidence	Message
48.0	60	80	A "on demand" execution of schedule task process process_name using commandline process in host dest

Reference

• https://thedfirreport.com/2020/04/20/sqlserver-or-the-miner-in-the-basement/

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

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/xmrig_miner/windows-sysmon.log

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