Well, we congratulated Mac on its 25th birthday - and then found some new rogueware. We've got two versions of this piece of malware and detect them both as not-a-virus:FraudTool.OSX.iMunizator.
By now, Windows users are used to programs which claim to detect problems on the computer, and then "offer" the user the chance to buy software to fix the problem. Mac users haven't been subjected to this, perhaps because malware traditionally doesn't target Macs, but this program is a clone of MacSweeper, which we first detected last year.
This program ups the figures that we gave over the weekend, and sounds a warning to Mac users to start approaching security in the same way that Windows users do.