The Flame espionage virus, believed to target Iran, among others, has been identified as the most complex malicious software ever discovered.
Security experts are still dissecting the Flame code, which is many times longer than any other computer virus, but some facts are clear:
Basics
Up to 20MB file (by comparison Stuxnet, which dmaage Iranian uranium centrifuges, is around 500KB)
Infects Windows XP, Windows Vista and Windows 7 systems
Detected in Iran, Russia, Egypt, the West Bank, Lebanon, Syria, Sudan
Espionage capabilities
Taking screenshots
Covert sound recording
Intercepting keyboard strokes
Monitoring network activity
Detects 100 types anti-virus software and conceals its presence
Creates a database to store stolen information
Communicates with command and control servers over encrypted channels
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Information source: http://www.telegraph.co.uk