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I sent a forensic image of its working memory to a leading expert on the security of the Macintosh operating system. He found unexpected daemons running on my machine, serving functions he could not ascertain. (A daemon is a background computing process, and most of them are benign, but the satanic flavor of the term seemed fitting here.) Some software exploits burrow in and make themselves very hard to remove, even if you wipe and reinstall the operating system, so I decided to abandon the laptop.
Off tbe top of my head, one could write a virus that modified the BIOS of a computer so that it loaded at every reboot. This would then inspect the installed operating system and download the appropriate daemon from the control website.
I'm certain that real virus writers could be much more creative.
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-- 6079 Smith W.
Depends how you do it - there are MBR viruses (and I think I've heard of GPT viruses as well) which can survive a reformat of the system partition. It's also possible to infect the BIOS / UEFI, though that's a lot harder, so they are pretty rare: BIOS Virus - Microsoft Community[^]
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