Ever on the alert to help Mac users, Prez Art Gorski sends this info: "Note that this malware cannot affect the latest version of Mac OS X. It is a PowerPC binary, which means it can only run on an old PowerPC Mac or an Intel Mac with Rosetta installed. Note also the Mac dialog box shown, which warns you not to trust this! That's why it's called social engineering, it depends on you clicking on it when you shouldn't." Here's the article.