Yes. The first virus for an Apple computer was created in 1982. The first virus for macOS (Mac.Leap) appeared in 2006. In early 2009, the Trojan Mac.Iservice infected machines that comprised the iBot zombie network. In 2012, half a million of computers were connected to the botnet created by the Trojan BackDoor.Flashback. It was Doctor Web who first discovered this zombie network.