From 2-spyware.com
Wwka ransomware is an infection targeting Windows OS users around the world. When it infects your computer, all personal files are encrypted with the RSA-2048 coding algorithm and are rendered useless until a specific decryption software is used to unlock them.
Within the presented ransom note (_readme.txt), the ransomware developers are trying to convince you that the only way to recover those files is by purchasing their decryption tool. Please don’t believe the cybercriminals as there might be other methods to regain access to your files.