A security firm says it has discovered a malware infection that it calls "a pesticide armed with a nuclear bomb." Check Point says the "Fireball" malware package originated in China and is believed to have infected more than 250 million computers worldwide. It says the malware is also present on 20% of corporate networks, with major infection centers in India, Brazil, and Mexico. Check Point calls it "possibly the largest infection operation in history." The software appears to be mainly intende