splunk-security_content/docs/_posts/2021-01-22-wbadmin_delete_system_backups.md

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

title	excerpt	categories	last_modified_at	toc	toc_label	tags
WBAdmin Delete System Backups	Inhibit System Recovery	Endpoint	2021-01-22	true		Inhibit System Recovery Impact Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint

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Description

This search looks for flags passed to wbadmin.exe (Windows Backup Administrator Tool) that delete backup files. This is typically used by ransomware to prevent recovery.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2021-01-22
• Author: Michael Haag, Splunk
• ID: cd5aed7e-5cea-11eb-ae93-0242ac130002

ATT&CK

ID	Technique	Tactic
T1490	Inhibit System Recovery	Impact

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=wbadmin.exe Processes.process="*delete*" AND (Processes.process="*catalog*" OR Processes.process="*systemstatebackup*") by Processes.process_name Processes.process Processes.parent_process_name Processes.dest Processes.user 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)`
| `wbadmin_delete_system_backups_filter`

Associated Analytic Story

• Ryuk Ransomware
• Ransomware

How To Implement

You must be ingesting endpoint data that tracks process activity, including parent-child relationships from your endpoints to populate the Endpoint data model in the Processes node. Tune based on parent process names.

Required field

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

Kill Chain Phase

• Actions on Objectives

Known False Positives

Administrators may modify the boot configuration.

RBA

Risk Score	Impact	Confidence	Message
15.0	30	50	System backups deletion on dest

Reference

• https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1490/T1490.md
• https://thedfirreport.com/2020/10/08/ryuks-return/
• https://attack.mitre.org/techniques/T1490/
• https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/wbadmin

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/attack_techniques/T1490/atomic_red_team/windows-sysmon.log

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