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New Ransomware Process Leverages Native Windows Features

A new methodology for instigating ransomware makes use of Windows’ own Encrypting File System (EFS). EFS has been a part of Windows since Windows 2000. Unlike Windows’ BitLocker — which is a full disk encryption feature — EFS can selectively encrypt individual files or folders. It does this transparently to the user, using a key that is partly stored in an accessible file, and partly computed from the user’s account password.

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