Companies have been crippled by an attack dubbed ‘Petya’, the second major ransomware crime in two months. Olivia Solon answers the key questions

Many organizations in Europe and the US have been crippled by a ransomware attack dubbed “Petya”. The malicious software has spread through large firms including the advertiser WPP, food company Mondelez, legal firm DLA Piper and Danish shipping and transport firm Maersk, leading to PCs and data being locked up and held for ransom.

It’s the second major global ransomware attack in the last two months. In early May, Britain’s National Health Service (NHS) was among the organizations infected by WannaCry, which used a vulnerability first revealed to the public as part of a leaked stash of NSA-related documents released online in April by a hacker group calling itself the Shadow Brokers.

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