A tool reportedly keeps Microsoft Defender from updating by briefly filling the drive

23 Sep 2026TECHNOLOGY & SOFTWARENEEDS REVIEWUpdated: 24 Oct 2026, 21:56 JST

A proof-of-concept tool is claimed to keep Microsoft Defender running while blocking it from installing updates. It reportedly waits for an update attempt, temporarily consumes the drive’s free space so the installation fails, then releases that space again. The tool is also said to keep a Microsoft cleanup utility file open in a way that can interfere with the update process.

A tool reportedly keeps Microsoft Defender from updating by briefly filling the drive

An antivirus may appear active while its updates stay old

If the claim is accurate, the unusual part is that the antivirus is not switched off: it may appear to be operating normally while its protection platform and threat information remain frozen at older versions.

Verification

UNVERIFIED

Feed metadata identifies a report, not independently verified underlying facts.

This source-attributed report has not been independently verified.

Sources

www.theregister.com