Researchers at ESET are tracking yet another outbreak of the insidious Koobface worm. The malware is spreading through Facebook messages that claim to offer hidden cameras showing erotic video. Users are asked to click on a link, which leads to a request to download a fake Adobe Flash update. If infected, machines are hit with a potent trojan cocktail that can block access to security websites, change DNS settings, install rogue anti-virus software and steal passwords. One unique feature of the ruse is that users can only click on the malicious link once — the next time they reach an error page. "It's assuming you're a security researcher trying to do research on it," Randy Abrams, director of technical education at ESET, told SCMagazineUS.com on Wednesday. — DK