How to Fix CrowdStrike Bug Causing Windows Blue Screen with Azure CLI Script

Introduction

Recently, there have been reports of Windows hosts experiencing blue screen errors related to the Falcon Sensor from CrowdStrike. This issue can cause significant disruptions, but fortunately, it can be resolved by removing a problematic file. In this blog post, we'll guide you through an Azure CLI script that automates the process of fixing this issue on Azure-hosted Windows VMs.

Understanding the Issue

The blue screen errors are linked to a specific file, , which is part of the CrowdStrike Falcon Sensor. The solution involves deleting this file from affected systems. While this can be done manually, automating the process using Azure CLI ensures a consistent and efficient approach, especially for environments with multiple virtual machines.

Prerequisites

• Azure CLI installed and configured on your local machine.

• Appropriate permissions to manage Azure resources, including VMs and disks.

• Basic understanding of Azure resource management.

The Azure CLI Script

Here's the step-by-step Azure CLI script to address the issue:

Instructions

1. Replace the Placeholder Variables:

2. Run the Script:

How It Works

• Step 1: Creates a snapshot of the OS disk to ensure data integrity.

• Step 2: Creates a temporary Windows VM to perform the repair.

• Step 3: Attaches the snapshot to the temporary VM.

• Step 4: Executes a PowerShell script on the temporary VM to delete the problematic file.

• Step 5: Detaches the fixed disk from the temporary VM.

• Step 6: Reattaches the fixed disk to the original VM.

• Step 7: Cleans up by deleting the temporary VM.

Conclusion

This Azure CLI script offers a streamlined solution to fix the CrowdStrike bug causing Windows blue screens. By automating the process, you can efficiently resolve the issue across multiple VMs, minimizing downtime and ensuring consistency. Feel free to adapt the script to your specific environment and requirements.

If you have any questions or need further assistance, please leave a comment below. Happy scripting!