@Mikael_z
You do realize what a trojan is, right? If you don't, please go and educate yourself.
A clue for you: It doesn't rely on any OS vulnerabilities. Instead it relies on social engineering. It is much more effective if there are, say, 1.5 billion users of the OS it was written for. On the other hand it isn't very effective when targeting one of the loser OSes due to those OSes' low marketshare.
http://en.wikipedia.org/wiki/Trojan_horse_(computing)
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