Symantec researchers warn that an email campaign is targeting Facebook users with the promise of a Facebook toolbar.

"If you decide to click on the download link, the downloaded file ('toolbar.exe') will present itself with an icon of a black ball with 'darkSector' written on it," writes Help Net Security's Zeljka Zorz. "That should be enough to raise suspicion."

"Symantec detects the file as a dropper Trojan," Zorz writes.

Click here to read the Help Net Security article.