Since this article was first published we have released a revised and more complete history of Mac malware. From the early 1980s, right up until the present day, here are some of the highlights in the history of Apple Mac malware. The first virus to affect Apple computers wasnt written for the Macintosh, but is of historic interest none the less. The Elk Cloner boot sector virus predates IBM PC viruses by some years. The first Mac malware outbreak was in Hong Kong, in 1998, when the next significant outbreak was first spotted in 1998.”]
Source: https://nakedsecurity.sophos.com/2010/11/24/apple-mac-malware-short-history/