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# 2 Case study 1: WannaCry

On 12 May 2017, a piece of malware spread rapidly and infected many computers across the globe. Many data files in infected computers were not openable. What was happening?

The next sections will answer the following questions:

1. What was the attack?
2. How did it work?
3. Who were the attackers?
4. What lessons can be learnt?

◄Contents►Next: 2.1 What was the attack?

OpenLearn - Learning from major cyber security incidents
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