Popup - CUPGOTEAM - Dota 2 & CS:GO Tournaments
A WhoIs lookup reveals the domain was registered via Reg.ru on June 24, 2021 (Updated July 10, 2021) - Whois cupgoteam.com
Associated Steam Account (likely compromised) - Steam Community :: CHeeky
Popup will redirect to a fake Steam login page designed to steal your credentials.