AtomXKoisuru, it was not a virus, but a parasite that munched on Uran's memories. A virus would spread; it would infect other tissue & that in turn, would affect even more tissue. The parasite was indeed intended for

, but the henchman was unfamiliar with him, & either mistook Uran for him, or thought it would make no difference which sibling was infected.
A true computer virus could interfere with any aspect of the computer's operation. I am not one who is well informed on this subject, as is Vergere, but, as I understand it, the creators of the virus need some data on the system they wish to attack. I think
some is an understatement; hackers are continually finding vulnerabilities with the Windows system, as indicated by the many patches Microsoft sends to all Windows computers, on an almost daily basis.