Sounds rather bad, sadly as Mac gains more ground in the PC world this will become more and more of a threat. Most people I talk to about Apple OS claim it to be the most secure OS, which for the most part is true, but thats only because its not a viable source of revenue for Trojans and other Malware. Now for the worse part of all, the majority of people who have this on their system probably won't be aware of it or be able to get rid of it.
And so begins the harrowing journey for the unfortunate IT personnel who have to explain security software over and over and over again, to Apple users who adamantly refuse to accept that their Precious could possibly be vulnerable.
Wouldn't a "tech-savvy" friend tell the person to re-install the OS?
If someone downloads pirated software via torrents and then installs that software with administrator/root privileges, they're clearly asking for it - and in fact deserve everything they get. Consider it "Darwinism in action", in fact.
The funny thing is that many windows users, those who when posting on forums, supposedly pay for all of their software, do that all the time, but rely on an anti-virus program to protect them from their own idiocy.