The endogenous retroviral evidence has matched the predictions of common descent. Had the evidence come out differently it would have falsified common descent. The crushing nail in the coffin for those aware of the evidence who would like the evidence to go away. Essentially since this evidence has appeared even people like Behe, Denton, and Dembski have been forced by the evidence to accept common descent.
The endogenous retroviral evidence has matched the predictions of common descent.
How about something larger than a virus. Viruses have some very unusual ways of behavior more mechainistic than biological. Viral reproduction is markedly different from other biological entities.