Bluetooth HID Keyboard: Is it a Security Risk?

TL;DR

A Bluetooth device showing up as an HID (Human Interface Device) keyboard isn’t necessarily dangerous, but it’s unusual for many devices and could be a sign of something malicious. Treat it with caution and investigate.

What is an HID Keyboard?

HID keyboards are the standard way computers recognise input from things like… well, keyboards! But also mice, gamepads, and other input devices. If your Bluetooth device appears as this, it means it’s presenting itself to your computer as a keyboard, even if it isn’t one.

Why is my Device Showing Up Like This?

There are several reasons:

• Genuine Devices: Some devices legitimately use HID for compatibility. For example, some presentation remotes or specialised controllers might do this.
• Firmware Issues: A bug in the device’s software could cause it to incorrectly identify itself.
• Malicious Software: This is the biggest concern. Malware can disguise itself as a keyboard to control your computer, steal data (like passwords), or install other harmful programs.

How to Check if It’s Safe – Step-by-Step

1. Identify the Device: What should this device be? Look at the packaging, model number, and any documentation you have.
2. Disconnect Immediately: If you don’t recognise it or are unsure, disconnect the Bluetooth device right away.
3. Check Connected Devices List: On Windows:
   1. Press Windows Key + R to open the Run dialog.
   2. Type devmgmt.msc and press Enter. This opens Device Manager.
   3. Expand ‘Bluetooth’.
   4. Look for the device in question. If it’s listed as an HID Keyboard, that confirms the issue.

   On macOS:

   1. Click the Apple menu and choose ‘System Preferences’.
   2. Click ‘Bluetooth’.
   3. Look for the device in question. Check its information – does it match what you expect?
4. Scan with Antivirus/Anti-Malware: Run a full system scan using your trusted antivirus software. Make sure it’s up to date first.
5. Check for Unusual Processes: Look in Task Manager (Windows) or Activity Monitor (macOS) for any processes you don’t recognise that are consuming CPU or memory. Be careful not to end legitimate system processes!

   tasklist /v

   (Windows command to list running processes with details)

6. Update Device Firmware: If the device is from a reputable manufacturer, check their website for firmware updates. Updating can fix bugs that cause incorrect identification.
7. Factory Reset (If Possible): Some Bluetooth devices have a factory reset option. This might restore them to a safe state. Consult the device’s manual.
8. Contact Manufacturer Support: If you’re still unsure, contact the manufacturer of the device for assistance. They may be aware of known issues or provide specific guidance.

What if I suspect Malware?

• Disconnect from the Internet: This prevents further communication with potential attackers.
• Run a Boot-Time Scan: Some malware is difficult to remove while Windows/macOS is running. A boot-time scan can help.
• Consider Reinstalling Your Operating System: As a last resort, reinstalling your OS will ensure the complete removal of any malicious software. Back up your important data first!

Preventative Measures

• Only Pair Known Devices: Don’t pair with Bluetooth devices you don’t recognise or trust.
• Keep Your Software Updated: Regularly update your operating system, antivirus software, and other applications.
• Be Careful with Public Bluetooth: Avoid pairing with Bluetooth devices in public places where they could be intercepted.