Facebook has apparently become a choice distribution channel for several malicious applications and a new variant of a pernicious piece of malware originally detected in 2008. The popular social networking site has been hit by at least three separate security issues in the last week — two phony applications and the latest variety of the Koobface worm, according to a report issued Monday by security research firm Trend Micro. Rik Ferguson, a security researcher at Trend Micro, first noticed the Koobface threat after he received a message via Facebook from a friend.
