hidclass.sys

Windows HID Class Driver (hidclass.sys)

CPU Usage

N/A

Memory

N/A

Location

N/A

Publisher

N/A

Risk Rating

Low

Recommended Actions

Maintain updated Windows and HID device drivers, verify the signature and path for hidclass.sys, and perform periodic malware scans. If unexpected behavior occurs, inspect hardware, run system file checks, and consider an in-place upgrade to repair system files.

What is hidclass.sys?

hidclass.sys is the Windows HID class driver that enables keyboard, mouse, and other USB HID devices to communicate with the operating system. It runs in kernel mode, initializes during boot, and coordinates input reports, device enumeration, and feature requests across the HID stack.

As part of the HID class driver stack, hidclass.sys handles enumeration, report routing, and interaction with HID mini-drivers and the user-mode HID layer. It processes input data using IRP_MJ_INTERNAL_DEVICE_CONTROL and relays events to Windows input subsystems.

Is hidclass-sys Safe?

hidclass.sys is a legitimate Windows kernel-mode driver that supports HID devices such as keyboards, mice, and game controllers. When located in the standard system path and properly signed by Microsoft, it is considered safe and required for normal input operations. Like any driver, it should be observed for tampering, corruption, or unexpected behavior, which can indicate a security concern.

Is hidclass-sys a Virus?

Under normal conditions, hidclass.sys is not a virus; it is a standard Windows driver. However, malware can masquerade as hidclass.sys or tamper with its signature, path, or integrity. If you notice unusual behavior, verify the signature, location, and hash, and run a full malware scan to rule out infection.

How to Verify Legitimacy

Check File Location: Confirm the binary is located at C:\Windows\System32\drivers\hidclass.sys and that no other copies exist in user-writable folders.
Verify Digital Signature: Open file properties and ensure the signature is from Microsoft Windows; use signtool verify /pa or Windows Explorer to view the signature chain.
Check File Hash: Compute SHA256 with certutil -hashfile C:\Windows\System32\drivers\hidclass.sys and compare against official Microsoft hashes from update catalogs.
Scan for Malware: Run Windows Defender or a trusted security product to scan hidclass.sys and related driver files for malware or tampering.

Red Flags: If hidclass.sys is missing from C:\Windows\System32\drivers, located in a user folder, or shows a non-Microsoft signature or unexpected version, treat as a potential compromise and investigate.

Why is it Running?

Reasons it's running:

Core HID support: hidclass.sys is required for Windows to recognize and manage keyboard, mouse, and other HID devices, enabling basic input functionality.
Device enumeration: During boot and after device plug-in, the driver enumerates HID devices and negotiates protocols with HID mini-drivers.
Kernel-mode input processing: Operating system input stacks rely on hidclass.sys to route HID reports from hardware into the OS's input pipeline.
Driver stack integrity: The driver participates in the HID stack and coordinates with user-mode layers to ensure correct event delivery.
Driver updates and compatibility: Windows updates or USB device updates may trigger hidclass.sys reloads to maintain compatibility and security.

Can I Disable or Remove It?

Common Problems

Common Causes & Solutions

: Identify the specific HID device causing the spike, update device drivers, unplug devices one by one to isolate the culprit, and run a malware scan if necessary.
: Run Windows Update to ensure all HID-related components are current, check for optional driver updates for keyboards and mice, and consider rolling back a problematic update if symptoms start after install.
: Boot to Safe Mode, run SFC /scannow and DISM, update BIOS/ chipset drivers, and test with minimal peripherals to identify conflicts.
: Reinstall the USB hub and HID device drivers via Device Manager, unplug and reconnect the device, or try the device on another computer to confirm hardware health.
: Ensure the system is clean; run sfc /scannow, verify the file path at C:\Windows\System32\drivers\hidclass.sys, and compare the digital signature with Microsoft certificates.
: Disable selective suspend for USB hubs in power settings, update USB controller drivers, and test with a different USB port or cable.

Frequently Asked Questions

What is hidclass-sys and what does it do?

hidclass.sys is the Windows HID class driver that enables communication between keyboards, mice, and other USB HID devices and the OS. It runs in kernel mode and is essential for basic input functionality.

Is hidclass-sys safe to have on my PC?

Yes, when located in the correct System32 path and properly signed by Microsoft. Problems usually indicate device conflicts, tampering, or malware masquerading as the driver.

Why does hidclass-sys use CPU or memory?

Normal activity occurs during I/O events or device enumeration. Excessive usage usually points to a faulty device, driver conflict, or malware; check Device Manager and run security scans.

Can I disable hidclass-sys to fix issues?

Disabling hidclass.sys is not recommended as it is a core HID component. You can disable individual HID devices in Device Manager or try a clean boot to identify conflicts.

How do I update or repair hidclass.sys?

Run Windows Update to obtain the latest driver package for HID devices. If needed, run sfc /scannow and DISM, or perform an in-place upgrade to repair system drivers.

What should I do if HID devices stop working after a change?

Reboot, disconnect all HID devices, and re-connect one at a time to identify a failing device. Update drivers, check for Windows updates, and check Event Viewer for HID-related errors.