SecureMac and Intego, among other security firms, today alerted the Mac community to a new Trojan threat, trojan.osx.boonana.a (Intego gives it the name OSX/Koobface.a), which is spreading via social networking sites like Facebook and e-mail. The trojan appears as a link in messages with the subject "Is this you in this video?", and when users click on the link, a Java applet downloads an installer, which modifies system files to bypass passwords and other protections.
