The malicious software behind the onslaught appeared to exploit a vulnerability in Microsoft Windows that was supposedly identified by the US National Security Agency for its own intelligence-gathering purposes and was later leaked to the internet.
With almost 45 NHS organisations from London to Scotland hit in the ransomware attack on Friday, patients of the state-funded countrywide service are facing days of chaos as appointments and surgeries have been cancelled.
There have been reports of infections in 99 countries, including the UK, US, China, Russia, Spain, Italy and Taiwan.
Ransomware is malicious software that infects machines, locks them by encrypting data and then attempts to extort money to let users back in.
US Computer Emergency Readiness Team (USCRT) under the Department of Homeland Security said it has received multiple reports of WannaCry ransomware infections in many countries around the world.
Sanchez's goal keeps Arsenal's top-four PL finish alive
The former Manchester City boss has no new injury concerns apart from long-term absentees Ibrahim Afellay and Stephen Ireland. Mark Hughes' men are also unbeaten in their last six home games against Arsenal , a run that stretches back to February 2010.
Mikko Hypponen, chief research officer at the Helsinki-based cybersecurity company F-Secure, called the attack "the biggest ransomware outbreak in history".
Spain's government said on Friday a large number of companies, including telecommunications giant Telefonica, had been attacked by cyber criminals who infected computers with ransomware.
Its ransom demands start at 300 dollars and increase after two hours to 400, 500 and then 600 dollars, said Kurt Baumgartner, a security researcher at Kaspersky Lab. Affected users can restore their files from backups, if they have them, or pay the ransom; otherwise they risk losing their data entirely.
Britain's National Cyber Security Centre, part of the GCHQ spy agency, said it was aware of a cyber incident and was working with NHS and the police to investigate.
He said: "This is an unprecedented scale". Microsoft released a patch (a software update that fixes the problem) for the flaw in March, but computers that have not installed the security update remain vulnerable.
Israeli police: Jordanian stabber shot dead in Jerusalem
The Israeli authorities, meanwhile, say at least 48 Israelis have been killed in attacks by Palestinians over the same period. A Palestinian stabbed an Israeli police officer near Jerusalem's Old City on Saturday and was shot at the scene.
Kaspersky researcher Costin Raiu cited 45,000 attacks in 74 countries, saying that the malware, a self-replicating "worm", was spreading quickly.
A top Russian mobile operator says it has come under cyberattacks that appeared similar to those that have crippled some United Kingdom hospitals.
Hospitals across Britain found themselves without access to their computers or phone systems. The attack froze computers at hospitals across the country, with some cancelling all routine procedures. Tom Griffiths, who was at the hospital for chemotherapy, said several cancer patients had to be sent home because their records or bloodwork couldn't be accessed. Portugal Telecom and Telefonica Argentina both said they were also targeted. "It's stressful enough for someone going through recovery or treatment for cancer".
Tom Donnelly, a spokesperson for the country's National Health Service (NHS), said the assault and its effects are still ongoing, according to The New York Times.
Also, the hack happened four weeks before a British parliamentary election in which national security and the management of the state-run National Health Service (NHS) are important campaign themes.
Singaporean charged with attempted murder over Brisbane hammer attack: Australian police
The incident had sparked a police manhunt for the man, who only arrived in Australia last Sunday (May 6). Police say the pair had previously been in a relationship for a period of months after meeting online.
- Sir Alex Ferguson right-hand man absolutely destroys Everton striker Lukaku
- Global cyber-attack: How roots can be traced to the US
- Coach is buying Kate Spade for $2.4 billion
- Microsoft announces major upcoming Windows 10 update
- 5 key questions about the NHS cyber hack answered
- 3 adjustments to make in Game 6 — Washington Wizards
- RSP Permian Inc (RSPP) Given a $65.00 Price Target at Roth Capital
- RBI initiates PCA against IDBI Bank
- Brocade Communications Systems, Inc. (NASDAQ:BRCD) showed monthly volitility of 0.36%
- 'Guardians of the Galaxy Vol. 2' Made Everybody Cry This Weekend