For me it's a bit odd to see such requests. I mean, Yandex is itself nearly a piece of adware, banned in some countries. It hacks my browser settings all the time. I mean its start page. So I would recomend remocing the Yandex browser altogether. On the other hand, if you have the virus anyway, there is a good removal guide for trusted browsers https://macsecurity.net/view/57-how-to-remove-trovi-adware-from-mac