China and Japan have both fallen victim to the global ‘ransomware’ cyber attack that has created chaos in 150 countries.
Chinese state media say more than 29,000 institutions across the country have been infected, along with hundreds of thousands of devices.
Xinhua News Agency cited the Threat Intelligence Centre of Qihoo 360, a Chinese internet security services company.
It said universities and educational institutions were among the hardest hit, numbering 4,341, or about 15 per cent of internet protocol addresses attacked.
Also affected were railway stations, mail delivery, petrol stations, hospitals, office buildings, shopping malls and government services.
Xinhua says the system used by PetroChina’s petrol stations was attacked, meaning customers could not use their cards to pay. Most stations had recovered.
Japanese companies say they are working to overcome the problems caused by the cyber attack.
The Japan Computer Emergency Response Team Co-ordination Centre said 2,000 computers at 600 companies in Japan had been affected.
Nissan confirmed on Monday some units had been targeted, but that it had responded and there had been no major impact on its business.
Hitachi spokeswoman Yuko Tainiuchi said it was experiencing email delays and file delivery failures and suspected the cyber attack was to blame, even though no ransom was being demanded. Programmes were being installed to fix the problem.