How the growing Russian ransomware threat is costing companies dear

With KP Snacks the latest cyber-attack victim, firms must learn to defend themselves against a mounting menace

The January snow lay thick on the Moscow ground, as masked officers of the FSB - Russia's fearsome security agency - prepared to smash down the doors at one of 25 addresses they would raid that day.

Their target was REvil, a shadowy conclave of hackers that claimed to have stolen more than $100m (74m) a year through ransomware" attacks, before suddenly disappearing.