Sophistication ... the code has more in it than your average virus.

"Teams responsible for the Flame and Stuxnet cyber-attacks worked together in the early stages of each threat's development, researchers have said.

Flame, revealed last month, attacked targets in Iran, as did Stuxnet which was discovered in 2010. Kaspersky Lab said they co-operated "at least once" to share source code.

"What we have found is very strong evidence that Stuxnet/Duqu and Flame cyber-weapons are connected," Kaspersky said.

Alexander Gostev, chief security expert at the Russian-based security company added: "The new findings that reveal how the teams shared source code of at least one module in the early stages of development prove that the groups co-operated at least once."

Vitaly Kamluk, the firm's chief malware expert, said: "There is a link proven - it's not just copycats."

Source: BBC

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