Mac users currently have little to worry about by way of viruses and malware. That’s little, not nothing. Macworld reports today on a new Trojan in the wild — a little thing called OSX.RSPlug.A: First Look: Trojan Horse warning: What you need to know:
… a new piece of OS X malware has been discovered. … Your machine could be infected if you’ve recently gone looking for some, um, less-than-flattering pictures of Britney Spears. Thinking you’ve found what you’re looking for, you click a video to watch it, only to see a message stating that your machine lacks the necessary codec. A disk image will then start downloading, and (depending on the settings on your machine) may then mount and launch an installer which asks for your admin password.
The Macworld article provides plenty more detail about what to check for, how to fix things and so on, so go and read up about it.
They go on to give some good advice:
As always, the best way to avoid these things is to not install software from untrusted sources—especially if it comes as an installer package and requests your administrator’s password!
Be careful out there.