anyone encounter .luqfeph behind pst extension? rename back to pst and do a scanpst.exe of it also cannot open/repair the pst file.

use malwarebyte to scan computer to clear malware and it is the same.

looks like  cryptolocker. :(

Cryptolocker locks also other office files, PDF files etc. (make a good offline backup.)

more information about this virus.

CryptoLocker is a ransomware program that was released around the beginning of September 2013 that targets all versions of Windows including Windows XP, Windows Vista, Windows 7, and Windows 8. This ransomware will encrypt certain files using a mixture of RSA & AES encryption. When it has finished encrypting your files, it will display a CryptoLocker payment program that prompts you to send a ransom of either $100 or $300 in order to decrypt the files. This screen will also display a timer stating that you have 72 hours, or 4 days, to pay the ransom or it will delete your encryption key and you will not have any way to decrypt your files. This ransom must be paid using MoneyPak vouchers or Bitcoins. Once you send the payment and it is verified, the program will decrypt the files that it encrypted.

Hi,

The .pst file may have been damaged by a virus. I can see the Date modified information from your image, but what's the size of it? If its size is quite small, like 0kb or 1kb, probably there is nothing in it and we can't recover them.

To prevent this kind of issue from happening, always keep your anti-virus program updated and scan your computer regularly. In this case, your .pst may have been damaged and not recoverable. This is why it is recommended to keep a backup of your important data separately.

Regards,

Melon Chen
TechNet Community Support