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* Remediation and Guidance Hub: Falcon Content Update for Windows Hosts
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Back
Remediation and Guidance Hub: Falcon Content Update for Windows Hosts
REMEDIATION AND GUIDANCE HUB: FALCON CONTENT UPDATE FOR WINDOWS HOSTS
Page last updated 2024-07-21 2106 UTC
Updated 2024-07-21 2106 UTC
As stated in our social media post at 2024-07-21 2106 UTC, together with
customers, CrowdStrike tested a new technique to accelerate impacted system
remediation. We’re in the process of operationalizing an opt-in to this
technique. Customers are encouraged to follow the Tech Alerts for latest updates
as they happen and they will be notified when action is needed.
We will continue to provide updates here as information becomes available and
new fixes are deployed.
CrowdStrike is actively assisting customers affected by a defect in a recent
content update for Windows hosts. Mac and Linux hosts were not impacted. The
issue has been identified and isolated, and a fix has been deployed. This was
not a cyberattack.
Customers are advised to check the support portal for updates. We will also
continue to provide the latest information here and on our blog as it’s
available. We recommend organizations verify they are communicating with
CrowdStrike representatives through official channels.
We assure our customers that CrowdStrike is operating normally and this issue
does not affect our Falcon platform systems. If your systems are operating
normally, there is no impact to their protection if the Falcon sensor is
installed.
We understand the gravity of this situation and are deeply sorry for the
inconvenience and disruption. Our team is fully mobilized to ensure the security
and stability of CrowdStrike customers.
OVERVIEW
STATEMENT FROM OUR CEO
Sent 2024-07-19 1930 UTC
Valued Customers and Partners,
I want to sincerely apologize directly to all of you for the outage. All of
CrowdStrike understands the gravity and impact of the situation. We quickly
identified the issue and deployed a fix, allowing us to focus diligently on
restoring customer systems as our highest priority.
The outage was caused by a defect found in a Falcon content update for Windows
hosts. Mac and Linux hosts are not impacted. This was not a cyberattack.
We are working closely with impacted customers and partners to ensure that all
systems are restored, so you can deliver the services your customers rely on.
CrowdStrike is operating normally, and this issue does not affect our Falcon
platform systems. There is no impact to any protection if the Falcon sensor is
installed. Falcon Complete and Falcon OverWatch services are not disrupted.
We will provide continuous updates through our Support Portal at
https://supportportal.crowdstrike.com/s/login/.
We have mobilized all of CrowdStrike to help you and your teams. If you have
questions or need additional support, please reach out to your CrowdStrike
representative or Technical Support.
We know that adversaries and bad actors will try to exploit events like this. I
encourage everyone to remain vigilant and ensure that you’re engaging with
official CrowdStrike representatives. Our blog and technical support will
continue to be the official channels for the latest updates.
Nothing is more important to me than the trust and confidence that our customers
and partners have put into CrowdStrike. As we resolve this incident, you have my
commitment to provide full transparency on how this occurred and steps we’re
taking to prevent anything like this from happening again.
George Kurtz
CrowdStrike Founder and CEO
TECHNICAL DETAILS
* Technical Details on the outage can be found here: Read the blog Published
2024-07-19 0100 UTC
* We assure our customers that CrowdStrike is operating normally and this issue
does not affect our Falcon platform systems. If your systems are operating
normally, there is no impact to their protection if the Falcon Sensor is
installed. Falcon Complete and OverWatch services are not disrupted by this
incident.
* CrowdStrike has identified the trigger for this issue as a Windows sensor
related content deployment and we have reverted those changes. The content is
a channel file located in the %WINDIR%\System32\drivers\CrowdStrike
directory.
* Channel file “C-00000291*.sys” with timestamp of 2024-07-19 0527 UTC or
later is the reverted (good) version.
* Channel file “C-00000291*.sys” with timestamp of 2024-07-19 0409 UTC is
the problematic version.
* Note: It is normal for multiple “C-00000291*.sys files to be present in
the CrowdStrike directory – as long as one of the files in the folder has
a timestamp of 05:27 UTC or later, that will be the active content.
* Symptoms include hosts experiencing a bugcheck\blue screen error related to
the Falcon Sensor.
* Windows hosts which have not been impacted do not require any action as the
problematic channel file has been reverted.
NON-IMPACTED HOSTS
* Windows hosts which are brought online after 2024-07-19 0527 UTC will not be
impacted
* Windows hosts installed and provisioned after 2024-07-19 0527 UTC are not
impacted Updated 2024-07-21 1435 UTC
* This issue is not impacting Mac- or Linux-based hosts
HOW DO I IDENTIFY IMPACTED HOSTS?
HOW DO I IDENTIFY IMPACTED HOSTS VIA ADVANCED EVENT SEARCH QUERY?
UPDATED 2024-07-21 0023 UTC
Please see this KB article: How to identify hosts possibly impacted by Windows
crashes (pdf) or log in to view in support portal.
HOW DO I IDENTIFY IMPACTED HOSTS VIA DASHBOARD?
UPDATED 2024-07-21 0858 UTC
Updated dashboards are available to show the status of Windows hosts potentially
impacted by the content update described in this Tech Alert. Use these
dashboards to get visibility to assist remediating Windows hosts. Please see
this KB article: Dashboards to identify Windows hosts impacted by the content
update defect (pdf) or log in to view in support portal.
HOW DO I REMEDIATE IMPACTED HOSTS?
If hosts are still crashing and unable to stay online to receive the Channel
File update, the remediation steps below can be used.
HOW DO I REMEDIATE INDIVIDUAL HOSTS?
UPDATED 2024-07-21 0932 UTC
* Reboot the host to give it an opportunity to download the reverted channel
file. We strongly recommend putting the host on a wired network (as opposed
to WiFi) prior to rebooting as the host will acquire internet connectivity
considerably faster via ethernet.
* If the host crashes again on reboot:
* Option 1 – Manual
* Please see this Microsoft article for detailed steps.
* Note: Bitlocker-encrypted hosts may require a recovery key.
* Option 2 – Automated via bootable USB key
* Follow the instructions in this KB article (pdf) or log in to view
in the support portal.
* Note: Bitlocker-encrypted hosts may require a recovery key.
HOW DO I RECOVER BITLOCKER KEYS?
UPDATED 2024-07-21 1810 UTC
Bitlocker Recovery Guidance for Knowledge Base (KB) Articles Resources
UPDATED 2024-07-21 1810 UTC
MICROSOFT AZURE
(PDF) or log in to view in the support portal.
UPDATED 2024-07-21 1810 UTC
SCCM
(PDF) or log in to view in the support portal.
UPDATED 2024-07-21 1810 UTC
ACTIVE DIRECTORY AND GPOS
(PDF) or log in to view in the support portal.
UPDATED 2024-07-21 1810 UTC
IVANTI ENDPOINT MANAGER
(PDF) or log in to view in the support portal.
UPDATED 2024-07-21 1810 UTC
MANAGEENGINE DESKTOP CENTRAL
(PDF) or log in to view in the support portal.
UPDATED 2024-07-21 1810 UTC
BIGFIX
(PDF) or log in to view in the support portal.
UPDATED 2024-07-21 0023 UTC
BITLOCKER RECOVERY WITHOUT RECOVERY KEYS
(PDF) or log in to view in the support portal.
WORKSPACE ONE PORTAL
Omnissa article
TANIUM
Tanium article
CITRIX
Citrix article
HOW TO RECOVER CLOUD-BASED ENVIRONMENT RESOURCES
Cloud Environment Guidance
AWS
AWS article
AZURE
Microsoft article
GCP
(PDF) or log in to view in the support portal
PUBLIC CLOUD/VIRTUAL ENVIRONMENTS
Option 1:
* Detach the operating system disk volume from the impacted virtual server
* Create a snapshot or backup of the disk volume before proceeding further as a
precaution against unintended changes
* Attach/mount the volume to to a new virtual server
* Navigate to the %WINDIR%\System32\drivers\CrowdStrike directory
* Locate the files matching “C-00000291*.sys”, and delete them
* Detach the volume from the new virtual server
* Reattach the fixed volume to the impacted virtual server
Option 2:
* Roll back to a snapshot before 2024-07-19 0409 UTC
THIRD PARTY VENDOR INFORMATION
UPDATED 2024-07-20 2259 UTC
Third Party Vendor Guidance
INTEL VPRO TECHNOLOGY REMEDIATION GUIDE
Remediate CrowdStrike Falcon® update issue on Windows systems with Intel vPro®
technology
RECOVERY FOR RUBRIK CUSTOMERS
CrowdStrike & Rubrik Customer Content Update Recovery For Windows Hosts
COHESITY SUPPORT
Cohesity’s support for CrowdStrike’s Falcon Sensor updates
ADDITIONAL RESOURCES
* Statement from our CEO
Published 2024-07-19 1915 UTC
* Falcon Sensor Content issue Likely Used to Target CrowdStrike Customers
Published 2024-07-19 2030 UTC
* Technical Details: Falcon Content Update for Windows Hosts
Published 2024-07-19 0100 UTC
* Likely eCrime Actor Uses Filenames Capitalizing on Falcon Sensor Content
Issues in Operation Targeting LATAM-based CrowdStrike Customers
Published 2024-07-20 0145 UTC
* Statement from our CEO
* Technical Details
* How do I identify impacted hosts?
* How do I remediate impacted hosts?
* How do I recover Bitlocker Keys?
* How do I recover Cloud–Based Environments?
* Third Party Vendor Information
* Additional Resources
Start your
free trial now.
Total protection has never been easier. Take advantage of our free 15-day trial
and explore the most popular solutions for your business:
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