Oil, gas and defence firms in Norway have been hit by a series of sophisticated hack attacks.
Industrial secrets and information about contract negotiations had been stolen, said Norway’s National Security Agency (NSM).
It said 10 firms, and perhaps many more, had been targeted in the biggest wave of attacks to hit the country.
Norway is the latest in a growing list of nations that have lost secrets and intellectual property to cyber thieves.
The attackers won access to corpora
te networks using customised emails with viruses attached which did not trigger anti-malware detection systems.