A major global cyber attack has the potential to trigger $53 billion of economic losses, the equivalent to a natural disaster like Superstorm Sandy. Lloyds of London report estimates average losses for a scenario involving a hacking of operating systems ranged from $9.7 billion to $28 billion. Economic costs in the hypothetical cloud provider attack could reach $8 billion global cost for cases like WannaCry ransomware that hit targets in more than 100 countries. In June, the NotPetya ransomware infected systems worldwide causing $850 million in economic costs.”]
Source: https://securityaffairs.co/wordpress/61236/hacking/lloyds-london-massive-cyber-attack-cost.html