A variant of the “Bugbear” worm, which spread around the Internet last October, opening back doors on computers and logging keystrokes, has started to infect users around the world, security experts said Thursday. Nearly a thousand users were affected by the worm, which is being called “Bugbear.B” and puts those infected at risk of losing confidential information, said Vincent Weafer, senior director of Symantec Corp.’s security response team. The original Bugbear worm had infected tens of thousands of computers when it hit last year. Leading security companies have upgraded the Bugbear variant’s status to a higher alert level within the last 24 hours. Full Story