Need help decrypting the file with the extension. combo

One fine morning it turned out that almost all files on the PC were encrypted. And a letter with extortion money. The files were formatted as .combo
Tell me how can I decrypt the files?

I am afraid there is no way to do this - as ransomware is designed to be “undecryptable” without the key.

You could try a place with a more security-focused community like https://forums.malwarebytes.com .

To prevent this from happening, make lots of backups. If you have a recent backup, restoring that one would be a good option. Make sure your backup does not get infected.