I tried several different queries. I realized I’m spending a lot of time on this without success. Does anyone have a ready XQL query for this?

Re: Cortex XDR Device Control Violation Alerts

susekar — Thu, 05 Feb 2026 14:37:48 GMT

Hello @D.Bengian ,

Greetings for the day.

It is important to clarify that Device Control Violations (the specific events where the agent blocks a device) are currently not included in the xdr_data dataset. Because BIOC rules operate on the xdr_data dataset, you cannot create a BIOC rule that triggers specifically based on the “Blocked” action of the Device Control module.

These violations are currently only visible in the Device Control Violations page of the console or accessible via the Public API.

However, you can create a BIOC rule to alert on the activity of a USB or removable device being connected (plugged in or mounted). While this does not differentiate between allowed and blocked devices, it allows you to generate alerts for any external device connection attempt.

XQL Queries for BIOC Rules:

You can use either of the following queries to create a BIOC rule for detecting removable device connections:

Option 1: Detecting Device Plug Events

This approach monitors USB plug activity:

dataset = xdr_data
| filter event_type = DEVICE and event_sub_type = DEVICE_PLUG

Option 2: Detecting Device Mount Events

This query identifies when a storage drive is successfully recognized and mounted by the operating system:

dataset = xdr_data
| filter event_type = MOUNT AND event_sub_type = MOUNT_DRIVE_MOUNT
| alter 
    vendor_id = json_extract_scalar(action_mount_device_info , "$.storage_device_vendor_id"), 
    product_id = json_extract_scalar(action_mount_device_info , "$.storage_device_product_id"), 
    serial_number = json_extract_scalar(action_mount_device_info , "$.storage_device_serial_number")

Alternative Methods for Violation Alerts

If you strictly require alerts for Device Control Violations (blocks), consider these alternatives:

Management Audit Log Forwarding

You can configure notification forwarding to send emails or syslog messages when a violation is logged.

Navigate to Settings → Configurations → General → Notifications
Select Management Audit Logs as the log type
Apply a filter for Device Control Violations to capture policy breach events

Cortex XDR Public API

Use the Get-Violations API endpoint to programmatically retrieve violation data and integrate it with your SIEM or alerting platform.

Removable Media File Execution Alerts

In your Restrictions Profile, you can enable notifications for Removable Media to report when files are executed from external drives.

If you feel this has answered your query, please let us know by clicking like and on "mark this as a Solution".

Thanks & Regards,
S. Subashkar Sekar

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Cortex XDR Device Control Violation Alerts