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Crowdstrike Falcone Microsoft System Crisis Workaround Steps for Public Cloud or Similar Environments (Including Virtual) Option 1: Detach, Fix, and Reattach Volume 1. **Detach the OS Disk Volume**: - Detach the operating system disk volume from the impacted virtual server. 2. **Create a Snapshot or Backup**: - Create a snapshot or backup of the disk volume to safeguard against unintended changes. 3. **Attach/Mount the Volume to a New Virtual Server**: - Attach or mount the detached volume to a new virtual server. 4. **Navigate to the CrowdStrike Directory**: - On the new virtual server, navigate to `%WINDIR%\System32\drivers\CrowdStrike`. 5. **Delete the Specific File**: - Locate the file matching the pattern `C-00000291*.sys`. - Delete this file. 6. **Detach the Volume from the New Virtual Server**: - Detach the volume from the new virtual server. 7. **Reattach the Fixed Volume to the Impacted Virtual Server**: - Reattach the fixed volume back to the impacted virtual server. Option 2: Roll Back to a Previous Snapshot Roll Back to a Snapshot: - Roll back the virtual server to a snapshot taken before 0409 UTC. These steps should help in resolving the issue with the virtual server impacted by the problematic channel file. #crowdstrike #falcon #microsoft #DIY #bugfixes #windowsoutage

Crowdstrike Falcon Crisis Workaround Steps for Individual Hosts: 1. Reboot the Host: • Connect the host to a wired network (ethernet) for faster internet connectivity. • Reboot the host to allow it to download the reverted channel file. 2. If the Host Crashes Again: a. Boot into Safe Mode or Windows Recovery Environment: • Connect the host to a wired network (ethernet) for faster internet connectivity. • Use “Safe Mode with Networking” for easier remediation. b. Navigate to the CrowdStrike Directory: • For Windows: • Navigate to %WINDIR%\System32\drivers\CrowdStrike. • For Windows Recovery Environment/Preinstallation Environment (WinRE/WinPE): • Navigate to Windows\System32\drivers\CrowdStrike on the OS volume. c. Delete the Specific File: • Locate the file matching the pattern C-00000291*.sys. • Delete this file. d. Boot the Host Normally: • Reboot the host normally. 3. Note: • For BitLocker-encrypted hosts, you may need to provide the recovery key. These steps should help in resolving the issue with the host crashing due to the problematic channel file. #crowdstrike #falcon #DIY##microsoft #systemrecovery

How to Identify Hosts Possibly Impacted by Windows Crashes" provides a detailed procedure for identifying Microsoft Windows hosts that might be affected by crashes related to the Falcon Sensor. Objective: - Identify Microsoft Windows hosts potentially impacted by crashes. - Scope the impact related to the Tech Alert concerning Windows crashes linked to the Falcon Sensor. Applies To: - Supported versions of the Falcon sensor for Windows. - Supported versions of Microsoft Windows. Procedure: Step 1: Determine Impacted Channel File Step 2: Execute the Main Query Key Outputs: - The systems that have last reported running an impacted version of Channel File 291 and have not been seen in the past hour. **Adjust Time Window: The time window (default one hour) can be modified as needed by changing the value in the query. Remediation: - Systems on the resulting list should be evaluated to ensure they are not impacted. - Further remediation instructions can be found in the related Tech Alert document. Conclusion: The document provides a step-by-step approach to identify potentially impacted Windows hosts by executing specific queries in the Advanced Event Search. Adjustments to the queries can be made based on the specific environment and requirements. #crowdstrike #microsoft #digitalshutdown

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