Recently my data on Windows 7 were locked by Onion ransomware (here is some information about it that I found on the internet). Is there any tools that I can try to recover the encrypted files? I don't have any backups.
If you have fallen victim to the Dharma ransomware virus you may check the Trend Micro or Kaspersky website for a decryption tool but before you try to decrypt your files you need to remove the virus from your computer. I believe Dharma is a variant of CrySiS family of ransomware so you need to be sure.