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Delete prevent_automatic_repair_mode_using_bcdedit.yml
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name: Prevent Automatic Repair Mode using Bcdedit
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id: 7742aa92-c9d9-11eb-bbfc-acde48001122
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version: 1
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date: '2021-06-10'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: This search is to detect a suspicious bcdedit.exe execution to ignore all failures.
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This technique was used by ransomware to prevent the compromise machine automatically boot in repair mode.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where Processes.process_name = "bcdedit.exe" Processes.process = "*bootstatuspolicy*" Processes.process = "*ignoreallfailures*"
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by Processes.parent_process_name Processes.parent_process Processes.process_name Processes.process Processes.dest Processes.user Processes.process_id Processes.process_guid
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`| `prevent_automatic_repair_mode_using_bcdedit_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA. Tune and filter known instances where renamed bcdedit.exe may be used.
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known_false_positives: Administrators may modify the boot configuration ignore failure during testing and debugging.
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references:
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- https://jsac.jpcert.or.jp/archive/2020/pdf/JSAC2020_1_tamada-yamazaki-nakatsuru_en.pdf
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tags:
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analytic_story:
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- Ransomware
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1490
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.process_name
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- Processes.process
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- Processes.dest
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- Processes.user
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- Processes.process_id
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- Processes.process_guid
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security_domain: endpoint
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