Nonsense. The number of Macs-specific viruses I have is something like 26. Most of those date back to System 6 and System 7. There were maybe one or two MacOS 9-era Mac viruses. However, the Mac-installation of
Office was vulnerable to the plethora of Microsoft
Office macro viruses including
VBA malware scripts. As for trojans, they were not a significant threat to MacOS 9 or any previous version of the OS.
A virus, by definition, must operate on its own once it is on your computer. No user intervention is required. What you are describing is not a virus; it is a trojan. There are not thousands of Mac trojans.
Symantec's
SARC site used to list every PC and Mac virus and every other threat. Before posting nonsense like this in the future, please Google the topic of Macintosh viruses and post some real information.