The cyber-attack that's already hit tens of thousands of people around the world could cause even more problems this week.
Experts say the attackers have made just over $51,000.
Run Windows Update: Updating your computer should ensure you have the latest security software to protect against viruses or malware.
NHS Grampian said it remains "completely confident" no patient data was accessed in the ransomware attack, which hit 13 health boards across the country and countless nationwide, leaving some with a backlog of postponed appointments to contend with. "The numbers are going up; I am anxious about how the numbers will continue to grow when people go to work and turn (on) their machines on Monday morning".
A statement from Microsoft President and Chief Legal Officer Brad Smith on Sunday criticised the way governments store up information about security flaws in computer systems.
"Most of these works will be completed over the weekend, but in some cases there will be minor disruption to IT services as works are completed and systems are brought back online".
The NHS regions across the United Kingdom were victims of a ransomware attack which affected computer systems around the world last week.
"We're obviously working with that business and the Australian Cyber Security Centre is engaging with them", Tehan told Sky News yesterday.
Ransomware has been a looming threat for a while, last Friday's attack was the most severe to date, combining worm-like deployment that enabled the infection to spread rapidly from computer to computer.
Problems with cyber security in NHS organisations were highlighted a year ago by Dame Fiona Caldicott, the national data guardian, who warned that issues were given insufficient priority and that health bodies persisted in using obsolete computer systems, The Times said.
It continued: "We would ask patients not to call the hospital to confirm appointments are still going ahead in order to keep our phone lines open for urgent enquiries".
Microsoft President Brad Smith, in a blog post Sunday, said the attack is a "wake-up call" for governments in the U.S. and elsewhere to stop stockpiling tools to exploit digital vulnerabilities.
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