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P4T12ICK
62 lines
2.2 KiB
YAML
62 lines
2.2 KiB
YAML
name: Fsutil Zeroing File
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id: 4e5e024e-fabb-11eb-8b8f-acde48001122
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version: 1
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date: '2021-08-11'
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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 fsutil process to zeroing a target
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file. This technique was seen in lockbit ransomware where it tries to zero out its
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malware path as part of its defense evasion after encrypting the compromised host.
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search: '| tstats `security_content_summariesonly` count values(Processes.process)
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as process values(Processes.parent_process) as parent_process min(_time) as firstTime
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max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=fsutil.exe
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Processes.process="*setzerodata*" by Processes.user Processes.process_name Processes.parent_process_name
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Processes.dest Processes.process Processes.parent_process | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `fsutil_zeroing_file_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.
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known_false_positives: unknown
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references:
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- https://app.any.run/tasks/e0ac072d-58c9-4f53-8a3b-3e491c7ac5db/
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tags:
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analytic_story:
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- Ransomware
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confidence: 90
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1070/fsutil_file_zero/windows-sysmon.log
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impact: 60
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kill_chain_phases:
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- Exploitation
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message: Possible file data deletion on $dest$ using $process$
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mitre_attack_id:
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- T1070
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observable:
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- name: dest
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type: Endpoint
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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.user
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- Processes.process_name
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- Processes.parent_process_name
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- Processes.dest
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- Processes.process
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- Processes.parent_process
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risk_score: 54
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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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