Friday’s cyber-attack has affected more than 200,000 victims in 150 countries.  The virus took control of users’ files, demanding payments; Russia and the UK were among the worst-hit countries.

Experts say another attack could be imminent and have warned people to ensure their security is up to date with a ‘Monday Morning Meltdown’ expected once businesses start to turn their IT equipment on.

 

 

The ransomware was unique because it was used in combination with a worm – allowing it to spread through an infected computer through an entire network.

 

Countries hit in initial hours of cyber-attack

 

The virus exploits a vulnerability in Microsoft Windows software, first identified by the US National Security Agency.

After taking computers over, it displayed messages demanding a payment of $300 in virtual currency Bitcoin to unlock files and return them to the user.