A major cyberattack has potentially hit more than 1,000 companies worldwide, forcing a Swedish supermarket chain to shut hundreds of stores. Hackers are demanding $70 million in bitcoin in exchange for data stolen in the ransomware attack against Miami-based IT company Kaseya. But what exactly is a ransomware attack, and who is behind this one? Here are some key questions about the attack, which has paralysed businesses since Friday. How bad is it? The full scale of this attack remains unclear. Kaseya initially said Friday that it believed only around 40 of its customers had been affected. But…

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