Popup - WebSecurerr
Associated Browser Extension - https://chrome.google.com/webstore/detail/websecurerr-browser-prote/odlnghcomkeenpeblhddfpacdncfjmna?utm_source=trust&utm_medium=lp4&utm_campaign=lp4
Though labelled as a free anti-virus and anti-malware application, it is secretly an adware program that also changes the browser's default search page to searchsecurer.com. A WhoIs lookup reveals that the program is operated out of the Russian Federation - https://www.whois.com/whois/searchsecurer.com