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tccontre
71 lines
2.6 KiB
YAML
71 lines
2.6 KiB
YAML
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: TTP
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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
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all failures. This technique was used by ransomware to prevent the compromise machine
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automatically boot in repair mode.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name = "bcdedit.exe"
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Processes.process = "*bootstatuspolicy*" Processes.process = "*ignoreallfailures*"
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by Processes.parent_process_name Processes.parent_process Processes.process_name
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Processes.process Processes.dest Processes.user Processes.process_id Processes.process_guid
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`|
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`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
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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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- Chaos Ransomware
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confidence: 80
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context:
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- Source:Endpoint
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/ransomware_ttp/data1/windows-sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: A suspicious process $process_name$ with process id $process_id$ contains
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commandline $process$ to ignore all bcdedit execution failure in host $dest$
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mitre_attack_id:
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- T1490
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: user
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type: User
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role:
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- Victim
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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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risk_score: 56
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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