New EFS Ransomware Attack Uses Windows Encrypting File System Against Itself

The newly-spotted form of ransomware takes advantage of encryption capabilities built into Windows making it difficult for AV vendors to stop it.

The Windows Encrypting File System (EFS) is Microsoft’s alternative to full disk encryption provided by BitLocker for business versions of the Windows OS. While BitLocker encrypts an entire drive, EFS selectively encrypts desired files and folders.


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