Perfectsidecom.ru is a browser redirect virus that replaces your default search engine with http://perfectsidecom.ru/news/. It also forcibly injects its own ads filling up almost all free space with them. This behavior not only reduces browsing experience but also causes slowness of the system.
Web Companion is a malware created by Lavasoft, that IT security experts categorize as an adware. This application is able to disturb you with pop-up and intrusive advertisement on all the webpages you visit, spoiling your internet browsing experience. The only and one purpose of such applications is to earn a profit on the advertisement that is sponsored by third-party companies.
Arena is a new variant of Dharma ransomware-type virus. Like all similar viruses, this one uses asymmetric encryption algorithm appending new extension (.arena) to affected files. For example, myfamily.jpg is changed to myfamily.jpg.arena.
Losers is a new ransomware infection related to notorious Nemesis and Cry36. Ransomware encrypts personal files with AES-256 encryption algorithm. During this, it renames affected files by adding .losers or .damoclis extension at the end, for example, myfamily.jpg is changed to myfamily.jpg.losers or myfamily.jpg.damoclis.
SlimCleaner is presented as a tool that helps to keep your drivers up-to-date in fully automated mode, that is, without your participation. In fact, the program serves to deliver bunch of ads on your computer thus completely destroying browser experience. Furthermore, SlimCleaner is the main culprit responsible for appearance of other advertising programs since it hides them behind its fake update notifications.