That's definitely Lenin, and he's not blackish; he's Bolshevik (hence 1917). I can't read Russian, but I guess the words are a slogan like, "Peace, Bread, Land".

My guess is that somebody's pranking you. Do you live on or near a college campus? I've never seen a virus with a communist agenda.

If this does turn out to be a virus, don't fuck around with it; just reformat. A reformat isn't hard, and it'll only take you a few hours to get back up and running.