Wellll, yesss....... but even Linux can be vulnerable to Trojans..... it requires some kind of 'user participation', but you can be just as at risk if you get fooled into installing it....
Someone earlier tried to say that virii, trojans, etc. were synonymous. Only true in that they all fall into the 'malware' category..... but the names as defined are pretty good differentiators.
Virus : malware that can infect a system without direct user involvement. Typically spreads/replicates itself to other systems. (Like a real virus... thus the name.)
Trojan : Concept derived from the famous "Trojan Horse" story. Typically embedded malware that looks like something else, but hides itself until it's 'inside the walls'. Usually requires some kind of direct user action. Not usually able to self-replicate, although Trojans can carry a virus as part of their package.
So far, the only active 'in the wild' OSX malware I've read about requires spoofing, trojans, or other 'social trickery' to overcome security safeguards.
Exploiting ignorance is a terrible weapon...
Funny, the first question that popped into my head when reading the post was, "Did Intego plant this thing??"..... it's almost too obvious, you know?
Thinking like that makes me some kind of crazy conspiracy theorist though, doesn't it.....

