It depends on who established the virus. Most are made by criminals for monetary obtain. Ransomware or phishing attacks tend to be of this kind. Some are created by hackers just simply because they can (as an intellectual obstacle to see who will detect the new virus and fix it) https://mailwizz-support34997.blogsmine.com/28694756/a-simple-key-for-best-wordpress-malware-removal-unveiled