After 23 years as a CIA analyst, having briefed the president and his team on every conceivable threat to national security, Bob Gerber was scared. More scared than he’d been in a long time. Holed up in his cramped, 11th floor office on a stark, colorless hallway at FBI headquarters in Washington, Gerber’s stomach turned as he took his first look at a new enemy. It was named Leaves after “w32.leave. worm,” the poisonous file it implanted in unsuspecting computers. Like all worms, Leaves bored through cyberspace, probing Internet connections for holes in personal computers or Web servers. It slithered inside the machines and spewed venomous strings of data that threw its victims into electronic shock. Full Story