If you are experiencing a lot of pop-up ads with Promextff.cool/ label in the browser then your system is infected with PUP. Most probably, it entered into the system when you were installing some free program downloaded from the Web and didn’t opt out of extra apps offered by download client. This is the most common method of malware distribution.
You click on a link or go to a site from the address bar and get redirected to https://valusc.com/?h=578072011_5aa678f47d2_100&h_l=&h_5=sub_id_2&h_2=def_sub instead. This browser behavior is caused by an adware program that got installed on your computer. An adware often crawls into the system along with freeware that you may have downloaded from the Internet.
Princess Evolution is the 3-rd version of PrincessLocker Ransomware that was spotted back in 2016. Although it refers to PrincessLocker family, Princess Evolution is a completely redesigned virus. According to the source, it mostly operates as a ransomware as a service (RaaS) looking for affiliates.
Dr. Clean Pro 2018 is a badware claiming to boost up your PC performance by fixing system issues, deleting junk files and corrupted registry entries. However, we should warn you, that it’s just a hoax which sole purpose is to trick users into paying money for the unneeded license. Completely opposite, Dr. Clean Pro 2018 will corrupt your computer’s work as it will generate pop-up ads, slow down your computer’s performance and show you frightening messages.
Searchcfn.com is not a real search provider, it’s merely intermediate web-page that redirects all user’s search queries to Yahoo.com. That’s the main source of income for the developers of this program. This type of malware is categorized as a browser hijacker.