Delete prevent_automatic_repair_mode_using_bcdedit.yml

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tccontre
2021-06-16 12:55:14 +02:00
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parent 0f5b2263f8
commit 95f24e5923
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name: Prevent Automatic Repair Mode using Bcdedit
id: 7742aa92-c9d9-11eb-bbfc-acde48001122
version: 1
date: '2021-06-10'
author: Teoderick Contreras, Splunk
type: batch
datamodel:
- Endpoint
description: This search is to detect a suspicious bcdedit.exe execution to ignore all failures.
This technique was used by ransomware to prevent the compromise machine automatically boot in repair mode.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
where Processes.process_name = "bcdedit.exe" Processes.process = "*bootstatuspolicy*" Processes.process = "*ignoreallfailures*"
by Processes.parent_process_name Processes.parent_process Processes.process_name Processes.process Processes.dest Processes.user Processes.process_id Processes.process_guid
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`| `prevent_automatic_repair_mode_using_bcdedit_filter`'
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 bcdedit.exe may be used.
known_false_positives: Administrators may modify the boot configuration ignore failure during testing and debugging.
references:
- https://jsac.jpcert.or.jp/archive/2020/pdf/JSAC2020_1_tamada-yamazaki-nakatsuru_en.pdf
tags:
analytic_story:
- Ransomware
kill_chain_phases:
- Exploitation
mitre_attack_id:
- T1490
product:
- Splunk Enterprise
- Splunk Enterprise Security
- Splunk Cloud
required_fields:
- _time
- Processes.parent_process_name
- Processes.parent_process
- Processes.process_name
- Processes.process
- Processes.dest
- Processes.user
- Processes.process_id
- Processes.process_guid
security_domain: endpoint