Homes and businesses have been warned they have just two weeks to secure personal and vital business information on their computers before a gang of international cybercriminals begins another campaign of hacking which has so far netted them €75m.

America has revealed more details about the attack by a band of hackers who implanted viruses on hundreds of thousands of computers around the world, seized customers’ bank information and stole more than 100 million dollars (€73m) from businesses and consumers.