You know, I think that likely is what I had a couple of months ago.
It is a trojan, enters via direct x, and is a popup stopper – it stops all popups except the same few it pops over and over and over.
It is extremely annoying. I tried every removal tool out there and ended up buying aluria spyware remover for $30 or so. It found and got rid of it in short order.
I tried to contact the 3 casinos and one sportsbook that were popping – One I was familiar with and they investigated and had no idea how they got in there. They did, however, contract out to various marketing companies.
The other places never responded.