How to remove 7zipper ransomware and decrypt .7zipper files

7zipper is ransomware virus that locks personal files by encrypting them. The way of encryption is unusual for this kind of malware, it simply archives the files to ZIP format and sets password on them. The name of all infected file is appended with the .7zipper. For instance, photo.png changes to photo.png.7zipper. After data compression, virus creates text file, which places in each folder with corrupted files.