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.
Probably inserted by a website via the cache, these occur in any browser. I’ve added the domain to Easylist for sake of security.
Would scan with malwarebytes, remove. The reboot the PC and re-scan to be sure its removed. Just be careful to disable the Malwarebytes browser extension, can be problematic.