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P4T12ICK
53 lines
1.9 KiB
YAML
53 lines
1.9 KiB
YAML
name: Fsutil Zeroing File
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id: f792cdc9-43ee-4429-a3c0-ffce4fed1a85
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version: 1
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date: '2021-12-07'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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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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data_source:
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- Windows Security 4688
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search:
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selection1:
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process.cmd_line|contains: setzerodata
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process.file.name: fsutil.exe
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condition: (selection1)
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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 net.exe may be used.
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known_false_positives: System administrators or scripts may delete user accounts via
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this technique. Filter as needed.
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references:
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- https://app.any.run/tasks/e0ac072d-58c9-4f53-8a3b-3e491c7ac5db/
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- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-file
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tags:
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analytic_story:
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- Ransomware
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- Insider Threat
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- Information Sabotage
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asset_type: Endpoint
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confidence: 90
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impact: 60
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest_device_id$ by user $dest_user_id$ atempting to perform file
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deletion.
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mitre_attack_id:
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- T1070
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observable: []
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product:
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- Splunk Behavioral Analytics
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required_fields: []
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kill_chain_phases:
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- Exploitation
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risk_score: 54
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1070/fsutil_file_zero/windows-security.log
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source: WinEventLog:Security
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