The virus contains about 20 times as much code as Stuxnet, which attacked an Iranian uranium enrichment facility, causing centrifuges to fail. It has about 100 times as much code as a typical virus designed to steal financial information, Schouwenberg said.
Flame can gather data files, remotely change settings on computers, turn on PC microphones to record conversations, take screen shots and log instant messaging chats.
He said there was evidence to suggest the code was commissioned by the same nation or nations that were behind Stuxnet and Duqu, which were built on a common platform.
Both Flame and Stuxnet appear to infect machines by exploiting the same flaw in the Windows operating system and employ a similar way of spreading.
That means the teams that built Stuxnet and Duqu might have had access to the same technology as the team that built Flame, he said.
Schouwenberg said he believed the attack was highly targeted, aimed mainly at businesses and academic institutions.
He estimated that no more than 5,000 personal computers around the world have been infected, including a handful in North America.
Kaspersky Lab discovered Flame while investigating reports that a virus dubbed Wiper was attacking computers in Iran.
The International Telecommunications Union, a U.N. agency that promotes research and cooperation on telecommunications technology, asked Kaspersky Lab to investigate those reports.
Schouwenberg said that his team discovered Flame, but failed to turn up anything that resembled Wiper.
(Reporting By Jim Finkle; editing by Edward Tobin and Ron Popeski)
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