name: Delete ShadowCopy With PowerShell
id: 5ee2bcd0-b2ff-11eb-bb34-acde48001122
version: 2
date: '2022-05-02'
author: Teoderick Contreras, Splunk
type: TTP
datamodel:
- Endpoint
description: This following analytic detects PowerShell command to delete shadow copy
  using the WMIC PowerShell module. This technique was seen used by a recent adversary
  to deploy DarkSide Ransomware where it executed a child process of PowerShell to
  execute a hex encoded command to delete shadow copy. This hex encoded command was
  able to be decrypted by PowerShell log.
search: '`powershell` EventCode=4104 ScriptBlockText= "*ShadowCopy*" (ScriptBlockText = "*Delete*"
  OR ScriptBlockText = "*Remove*") | stats count min(_time) as firstTime max(_time) as lastTime
  by Opcode Computer
  UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
  | `delete_shadowcopy_with_powershell_filter`'
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the powershell logs  from your endpoints. make sure you enable needed
  registry to monitor this event.
known_false_positives: unknown
references:
- https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
- https://www.techtarget.com/searchwindowsserver/tutorial/Set-up-PowerShell-script-block-logging-for-added-security
tags:
  analytic_story:
  - DarkSide Ransomware
  - Ransomware
  - Revil Ransomware
  confidence: 90
  context:
  - Source:Endpoint
  - Stage:Execution
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/powershell_script_block_logging/sbl_xml.log
  impact: 90
  kill_chain_phases:
  - Exploitation
  message: An attempt to delete ShadowCopy was performed using PowerShell on $Computer$
    by $User$.
  mitre_attack_id:
  - T1490
  observable:
  - name: User
    type: User
    role:
    - Victim
  - name: Computer
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - ScriptBlockText
  - Opcode
  - Computer
  - UserID
  - EventCode
  risk_score: 81
  security_domain: endpoint
  asset_type: Endpoint