splApache-2.0from splunk/security_content

Windows File and Directory Permissions Remove Inheritance

The following analytic detects the removal of permission inheritance using ICACLS. This analytic identifies instances where ICACLS is used to remove permission inheritance from files or directories. The /inheritance:r flag, which strips inherited permissions while optionally preserving or altering explicit permissions, is monitored to detect changes that may restrict access or establish isolated permission configurations. Removing inheritance can be a legitimate administrative action but may also indicate an attempt to conceal malicious activity or bypass inherited security controls.

Quality

FP risk

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Forks

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Rule sourcedetections/endpoint/windows_file_and_directory_permissions_remove_inheritance.yml

| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes
  WHERE Processes.process_name IN( "icacls.exe", "cacls.exe", "xcacls.exe")
    AND
    Processes.process = "*/inheritance:r*"
  BY Processes.action Processes.dest Processes.original_file_name
     Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
     Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
     Processes.process Processes.process_exec Processes.process_guid
     Processes.process_hash Processes.process_id Processes.process_integrity_level
     Processes.process_name Processes.process_path Processes.user
     Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_file_and_directory_permissions_remove_inheritance_filter`