Run the antivirus and get rid of the trojan. Just so you know, Trojans come through the internet in a variety of ways. It’s showing Brave because that’s a web browser. It might have gotten to your computer through anything you’ve downloaded or installed on your device. It could be extensions, programs, emails, pictures, etc. It also doesn’t mean it had to come from Brave, as anything on your device that’s connected to the internet could have been a gateway.