In May 2017, ransomware virus WannaCry swept through organisations around the world, locking computer screens, encrypting files and demanding a ransom to be paid in Bitcoin. Nearly 18 months on, businesses are still battling to protect their networks and stave off the next cyber meltdown.

The virus exploited a vulnerability in the Windows operating system, forcing critical infrastructure offline for days as it spread through 150 countries, hitting an estimated 45,000 organisations. Despite the large numbers, WannaCry was quickly stopped in its tracks and only a few businesses paid the ransom. However, the attack exposed weaknesses in basic security processes, with many organisations leaving their networks unprotected and failing to update or “patch” security vulnerabilities. Ever since, the cybersecurity industry has thought long and hard about the lessons of WannaCry. Read more..