This analytic identifies potential adversaries that modify the security permission of a specific file or directory. This technique is commonly seen in APT tradecraft and coinminer scripts to evade detections and restrict access to their component files.
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Icacls Grant Command Help
To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA. Tune and filter known instances where renamed icacls.exe may be used.
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| tstats`security_content_summariesonly`values(Processes.process) as process values(Processes.process_id) as process_id countmin(_time) as firstTime max(_time) as lastTime fromdatamodel=Endpoint.Processes where Processes.process_name = "icacls.exe"OR Processes.process_name = "cacls.exe"OR Processes.process_name = "xcacls.exe"AND Processes.process = "*/grant*"by Processes.parent_process_name Processes.process_name Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `icacls_grant_command_filter`