A workaround to fix the BSOD caused by CrowdStrike's faulty update involves booting Windows in Safe Mode and deleting the security firm's “C-00000291*.sys” file
They trigger an issue that causes Windows to blue screen. — I am unsure how these got pushed to customers. I think Crowdstrike might have a problem. … X: @vxunderground : How to fix the Crowdstrike thing: 1. Boot Windows into safe mode 2. Go to C:\Windows\System32\drivers\CrowdStrike 3. Delete C-00000291*.sys 4. Repeat for every host in your enterprise network including remote workers 5. If you're using BitLocker jump off a bridge @0xtib3rius : Lol, Microsoft are suggesting rebooting machines 15 times can solve the problem. This. Is. Chaos. #CrowdStrike #CrowdStroke #CrowdStruck [image] Sanjeev Sanyal / @sanjeevsanyal : So, the whole thing is about a single rogue file called C-00000291*.sys Tells you how fragile modern civilization is...... @blenster : A whole lot of people are learning some hard lessons on process and procedures today. Have empathy for those dealing with this mess; many have asked for changes that would have helped with this and were told no. Vadim Yuryev / @vadimyuryev : Here's a FIX for the Blue Screen of Death for both Windows and Mac users! #BSOD $CRWD Windows: 1. Boot into safe mode 2. Go to C:\Windows\System32\drivers\Crowdstrike directory 3. Delete C-00000291*.sys 4. Restart (credit @MacPaw) Mac: 1. Don't worry. You're not impacted 😂💯🖥️ [image] Forums: Hacker News : Ask HN: What is in C-00000291*.sys?
Context & Ripple Effects
The immediate story follows reports that a CrowdStrike update took banks, airlines, and other businesses offline through Windows crashes. The proposed recovery is operationally difficult because it must be carried out machine by machine, including on remote endpoints.
Subsequent coverage tied the crash to a Falcon sensor configuration logic error and reported that the deletion-based remedy could not be automated at scale. That makes this less a routine patch failure than a test of how enterprises recover when a deeply integrated security tool disables access to the systems it protects.
First-order effects
- IT teams must boot affected Windows devices into Safe Mode and remove the named driver file, creating a hands-on recovery task for each affected host, particularly where the fix cannot be automated at scale.
- CrowdStrike customers face continued disruption until endpoints are remediated; BitLocker can add a recovery-access hurdle for devices that require it.
Second-order effects
- Organizations will have to divert help-desk and endpoint-management capacity toward device recovery, with remote-worker fleets likely taking longer to restore than centrally accessible machines.
- The incident puts immediate scrutiny on CrowdStrike's update controls after the company attributed the outage to a Falcon sensor configuration logic error, while customers reassess the operational safeguards around endpoint-security changes.
Third-order effects
- Security vendors and enterprise buyers are likely to place greater weight on staged rollouts, rollback paths, and recovery procedures for software with kernel-level access; the value of those controls rises when failures cannot be centrally reversed.
- The event highlights a structural concentration risk in endpoint security: a single supplier's update can become an enterprise-wide availability incident when its software sits at the operating system core, as coverage noted of the privileged access endpoint tools require.
The trend: This is one data point in the shift toward treating security-agent deployment and recoverability as core resilience requirements, not merely security-operations concerns.