splunk-security_content/dev/endpoint/wbadmin_delete_system_backups.yml

name: WBAdmin Delete System Backups
id: cd5aed7e-5cea-11eb-ae93-0242ac130002
version: 1
date: '2021-01-22'
author: Michael Haag, Splunk
status: production
type: TTP
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.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine: '*delete*'
    Image|endswith: wbadmin.exe
  selection2:
    CommandLine:
    - '*systemstatebackup*'
    - '*catalog*'
  condition: selection1 and selection2
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.
known_false_positives: Administrators may modify the boot configuration.
references:
- 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
tags:
  analytic_story:
  - Ryuk Ransomware
  - Ransomware
  - Prestige Ransomware
  asset_type: Endpoint
  confidence: 50
  impact: 30
  message: System backups deletion on $dest$
  mitre_attack_id:
  - T1490
  observable:
  - name: dest
    type: Endpoint
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 15
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1490/atomic_red_team/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog