Academics from Greece have devised a new browser-based attack that can allow hackers to run malicious code inside users’ browsers even after users have closed or navigated away from the web page on which they got infected.

This new attack, called MarioNet, opens the door for assembling giant botnets from users’ browsers. These botnets can be used for in-browser crypto-mining (cryptojacking), DDoS attacks, malicious files hosting/sharing, distributed password cracking, creating proxy networks, advertising click-fraud, and traffic stats boosting, researchers said.