I'm the only one in the house using a computer, possibly someone from outside has been picking up my Airport connection? I thought I had that secure?
Thanks for the link, will look now
Unfortunately, that's not how it works.
Trojans are installed one way - by the user. The term comes from the story of the Trojan Horse, which the Greeks used to lay siege to Troy. From Wikipedia:
It was the stratagem that allowed the Greeks finally to enter the city of Troy and end the conflict. In the best-known version, after a fruitless 10-year siege of Troy the Greeks built a huge figure of a horse in which a select force of men hid. The Greeks pretended to sail away, and the Trojans pulled the Horse into their city as a victory trophy. That night the Greek force crept out of the Horse and opened the gates for the rest of the Greek army, which had sailed back under cover of night. The Greek army entered and destroyed the city, decisively ending the war. A "Trojan Horse" has come to mean any trick that causes a target to invite a foe into a securely protected bastion or place.
So, in computer terms, a Trojan is simply a piece of seemingly desirable software that masks malicious software beneath the surface. In this case, it is distributed through a program that claims to be a plug-in that allows you to watch a video online. The website insists that you must download this plug-in in order to continue. Once you do, you'll be prompted to install the software and enter your password. It's at that point, that it should raise the red flag, as very few programs need you to enter your password (your password is needed when a program wants to modify the operating system or system settings).
I want to make this point clear as a lot of people don't understand the difference between a virus, trojan, worm or adware/spyware. At the moment, there is nothing more than trojans that effect the Mac. So, if and when you run into this again, you'll know exactly what to do - don't install any software unless it is from a source you trust and you know exactly what it does - and be especially wary if you're prompted for your admin password.