We conclude that the EFS ransomware is an alarming concept and a possible new threat in the ransomware horizon. Most affected vendors deployed updates to address this new technique. We then notified 17 major anti-malware and anti-ransomware vendors for Windows endpoints, provided them our PoC, and discovered that many products were affected. All 3 solutions failed to protect against this threat.
We put 3 anti-ransomware solutions from well-known vendors to the test against our EFS ransomware. In this blog post we describe EFS-based ransomware (ransomware which abuses the Windows Encrypting File System), which is a new concept we developed in Safebreach Labs. Consequently, many security solutions are now available, which attempt to address the ransomware threat. If it's to recover the lost EFS encrypted files, you need to download EaseUS Data Recovery Wizard to recover encrypted files on a Windows NTFS hard drive, USB flash drive or SD card without a hassle.Ransomware is a serious threat to individuals, SOHOs/SMBs and large enterprises. How to Recover Deleted EFS Encrypted Filesĭue to some careless operation on the encrypted files by the owner, such as deletion, disk formatting, or virus infection, the encrypted files disappeared without expectation. Clear the Encrypt Contents to Secure Data check box. Switch to the Security tab, and click Advanced. Right-click on the file and select Properties. This time use the File Properties to decrypt EFS files. Without Using the passwordįorgetting the password is the case, or sometimes it's because the encryption keys are corrupt by a hard drive error. To unlock these files, all you need to do is to log into your computer using the password. The EFS encrypted files have a lock displayed on the icon. One is with the password, while the other is without the password due to own mistake or key corruption. Usually, there are two groups of people requesting EFS decryption. Visitors who are looking for solutions to decrypt BitLocker files or recover encrypted files by ransomware should go to the linked pages. Here, we focus on discussing the possibilities of unlocking EFS encrypted files only. If you move the EFS encrypted hard drive to another computer, you can not access files on the device encrypted with EFS, either.ĮFS is one of the multiple ways to encrypt individual files and folders in Windows. Otherwise, Microsoft Windows will deny access to the locked data.
Adopting EFS means that unauthorized users need to ask permissions when accessing files and folders. Encrypting File System (EFS) provides the core file encryption technology to protect critical and sensitive files on NTFS file system volumes with a certificate or key.
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