Global security firm Prosegur has been hit by a Windows ransomware attack and has shut down at least a part of its network, the company announced on Wednesday.

Last week, Microsoft chief executive Satya Nadella visited Australia and it is fair to say that he received such a lot of puffs in the media that he could well have thought he had landed in a bakery.

Malicious attackers are using fake emails about Windows updates to trick users into downloading the Cyborg ransomware, the security firm Trustwave claims.