Windows Security and BYOVD attacks

Windows Security the Critical Setting You Need to Enable to stop BYOVD attacks

 We are diving into a crucial security feature that could be the difference between a security system and a ransomware nightmare. Let's talk about the Microsoft Vulnerable Driver Blocklist and why you absolutely need to have it enabled.

The Setting That Matters

First things first, let's make sure you've got this essential setting turned on

Open Windows Security (just type it in the Start bar)

Click on Device Security

Look for Core isolation

Ensure Memory Integrity is on

Scroll down to find Microsoft vulnerable driver blocklist

Make sure it's turned on

Don't panic if it's grayed out  as long as it's on and Memory Integrity is enabled, you're good to go.

Why This Setting Is a Big Deal

Ransomware groups are getting sneaky, and one of their favorite tricks is called Bring Your Own Vulnerable Driver (BYOVD). Here's how it works

Attackers use a vulnerable driver from a legitimate program (like a partition manager)

They drop this driver onto your system

The driver, being signed by Microsoft, is trusted by your system

They exploit the vulnerability to gain elevated privileges

Game over – they can now bypass your antivirus and encrypt your data

The Scary Part? You don't even need to use the vulnerable program. Attackers can bring their own driver and wreak havoc.

Big Names, Big Problems

Some of the most notorious ransomware groups using this technique include

Scattered Spider

Lazarus

Black Byte

LockBit

These groups have successfully attacked major companies with topnotch security systems. How? Often through techniques like BYOVD.

System Privileges The Keys to the Kingdom

When attackers gain system privileges, they essentially have full control over your computer. They can

Modify any folder contents

Bypass folder protection mechanisms

Disable security features with simple PowerShell scripts

ZeroDay Vulnerabilities The Ultimate Threat

While the vulnerable driver blocklist is great for known threats, it can't protect against zeroday vulnerabilities. These are unknown flaws that attackers discover and exploit before anyone else knows about them.

Balancing Security and Performance

Some gamers might be tempted to disable memory integrity and core isolation features for better performance. But here's a pro tip never disable the blocklist if you want to stay secure.

Enabling the Microsoft Vulnerable Driver Blocklist is a simple yet powerful step in protecting your system from sophisticated attacks. It's not foolproof, especially against zeroday threats, but it significantly raises the bar for potential attackers.

Remember, in the world of cybersecurity, every layer of protection counts. So, take a minute now to check your settings and ensure you're not leaving an open door for ransomware groups.