We're being actively targeted - our external security partner has said everything is OK, but we are back at it and having a look. Thanks for reporting. And thanks to @Giverny - 3pm on a Friday! :/
Thanks for the replies. I wanted to make sure that it wasn't just me. I typically close my browser via "ctrl-alt-del" rather than click on any part of the unwanted page. Perhaps I am being too cautious?