Symantec says it has discovered one of the most sophisticated pieces of malicious software ever seen.

Symantec says the bug, named Regin, was probably created by a government and has been used for six years against a range of targets around the world.

Researchers say the sophistication of the software indicates that it is a cyber-espionage tool developed by a nation state.

Symantec has drawn parallels with Stuxnet, a computer worm thought to have been developed by the US and Israel to target Iran’s nuclear program.

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