Windows Defender Bug Needs a Restart, Not Shutdown, To Enable Sandbox

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Last week Microsoft announced that users can enable a feature that adds Windows Defender to a sandbox, which protects the computer from vulnerabilities found in Defender. A bug was discovered, though, that may cause you to think that this sandbox feature is enabled, when it really isn’t.

To enable the sandbox feature a user needs to create a system environment variable named MP_FORCE_USE_SANDBOX and set it to 1. They then need to restart Windows to activate it.

ISC Handler Didier Stevens has discovered a bug in this process that causes the Windows Defender sandbox to not activate if you shutdown the computer, rather than restarting it.

“I encountered an issue to activate the sandbox: after creating the system environment variable, I shutdown


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