An anonymous reader writes: F-Secure is warning Mac users of the presence of the first "rogue application" for OS X, MacSweeper. The application purports to scan a Mac system for files that can or need to be removed, but as F-Secure notes, "it will always find something to fix/clean but the only way to do so is to buy the program". Once the software is installed, it will periodically display a popup dialog stating that the computer has been compromised and that the user needs to buy MacSweeper to remove the non-existent files.
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