bcdedit_failure_recovery_modification.yml

name: BCDEdit Failure Recovery Modification
id: 809b31d2-5462-11eb-ae93-0242ac130002
version: 1
date: '2020-12-21'
author: Michael Haag, Splunk
status: production
type: TTP
description: This search looks for flags passed to bcdedit.exe modifications to the
  built-in Windows error recovery boot configurations. This is typically used by ransomware
  to prevent recovery.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine: '*recoveryenabled*'
    Image|endswith: bcdedit.exe
  selection2:
    CommandLine: '* no*'
  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#atomic-test-4---windows---disable-windows-recovery-console-repair
tags:
  analytic_story:
  - Ryuk Ransomware
  - Ransomware
  asset_type: Endpoint
  confidence: 80
  impact: 100
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ attempting disable the ability to recover the
    endpoint.
  mitre_attack_id:
  - T1490
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 80
  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
    update_timestamp: true