Computer malware described as "the most sophisticated cyberweapon yet unleashed" has been uncovered in computers in the Middle East and may have infected machines in Europe, according to reports from antivirus researchers and software makers in Russia, Hungary and Ireland.

The malware, dubbed Worm.Win32.Flame, is unusual in its complexity, size and the multitude of ways it has of harvesting information from an infected computer including keyboard, screen, microphone, storage devices, network, Wi-Fi, Bluetooth, USB and system...