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P4T12ICK
60 lines
2.2 KiB
YAML
60 lines
2.2 KiB
YAML
name: Windows Information Discovery Fsutil
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id: 2181f261-93e6-4166-a5a9-47deac58feff
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version: 1
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date: '2022-11-30'
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author: Teoderick Contreras, Splunk
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status: production
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type: Hunting
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description: The following analytic identifies a process execution of Windows OS built-in
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tool FSUTIL to discover file system information. This tool is being abused or used
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by several adversaries or threat actor to query/list all drives, drive type, volume
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information or volume statistics by using the FSINFO parameter of this tool. This
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technique was seen in WINPEAS post exploitation tool that is being used by ransomware
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prestige to gain privilege and persistence to the targeted host.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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CommandLine: '*fsinfo*'
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OriginalFileName: fsutil.exe
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selection2:
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Image|endswith: fsutil.exe
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condition: selection1 or selection2
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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 of wermgr.exe may be used.
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known_false_positives: unknown
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references:
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- https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil
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- https://github.com/carlospolop/PEASS-ng/tree/master/winPEAS
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- https://www.microsoft.com/en-us/security/blog/2022/10/14/new-prestige-ransomware-impacts-organizations-in-ukraine-and-poland/
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tags:
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analytic_story:
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- Windows Post-Exploitation
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- Prestige Ransomware
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asset_type: Endpoint
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confidence: 30
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impact: 30
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message: process $process_name$ with commandline $process$ is executed in $dest$
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mitre_attack_id:
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- T1082
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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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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 9
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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/malware/winpeas/winpeas_fsutil/fsutil-fsinfo-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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