The assault, which began Friday and was being described as the biggest-ever cyber ransom attack, struck state agencies and major companies around the world - from Russian banks and British hospitals to FedEx and European auto factories.
Chinese local authorities from traffic police to industry regulators were hobbled on Monday by a massive global ransomware attack, but the spread of the WannaCry worm in the country appeared less aggressive than initially feared.
Other affected groups included Indonesia's largest cancer hospital and industrial conglomerate Hitachi Ltd. Officials in India said it had received a few reports of attacks and South Korea's presidential Blue House office identified 9 cases of ransomware in the country.
"Once connected, an attacker can try to guess passwords for users on the system, or look for backdoors giving them access", HHS said in an emailed statement.
"We take cyber security seriously", said May, who was responsible for domestic security for six years as home secretary before becoming prime minister last year.
As terrifying as the unprecedented global "ransomware" attack was, cybersecurity experts say it's nothing compared to what might be coming - especially if companies, organizations and governments don't make major fixes. "We can't drop our guard", said a Sabadell spokesman.
The perpetrators of the attack are still not known.
"You are dealing with a criminal", he said.
In a snap election campaign which May has dominated so far, the debate over the cyberattack on the NHS forced her onto the defensive, although it was not immediately clear what impact, if any, it would have on her popularity.
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USA media said Mr Trump had shared material that was passed on by a partner which had not given permission. And Putin spokesman Dmitry Peskov said, "we do not want to have anything to do with this nonsense".
On Friday, Microsoft released patches to fix a vulnerability in older software. The company's shares were down about 1% on Monday, in a slightly higher broad market. Apparently, experts warn that the virus could "come back" in computers that have been fixed already. Some have also been machines involved in manufacturing or hospital functions, hard to patch without disrupting operations.
She said the attack had not been focused on the NHS but was part of a wide worldwide issue, and said the government had invested 2 billion pounds in cyber security.
As of 9pm Monday Thailand time (1400 GMT) the total value of funds paid into anonymous bitcoin wallets the hackers are using stood at just $55,169, or less than 2 million baht from 209 payments, according to calculations made by Reuters using publicly available data. At the height of the attack Friday and early Saturday, 48 organizations in the NHS were affected, and hospitals in London, North West England and Central England urged people with non-emergency conditions to stay away as technicians tried to stop the spread of the malicious software.
The new infections were largely in Asia, which had been closed for business when the malware first struck.
Renault-Nissan said output had returned to normal at almost all its plants.
In a blog post published on Sunday, Brad Smith, Microsoft's president and chief legal officer, called out the USA government for "stockpiling" vulnerabilities, noting that the WannaCry malware used in the attack was stolen from the NSA and published by hackers. Why were so many NHS systems still running this out-of-date software? "We are lucky that this logic bug is still present", Suiche said.
This afternoon, hospital chiefs revealed how some radiotherapy appointments had to be postponed as a result of the attack. The attack hit one in five of the nation's 248 National Health Service (NHS) groups.
Tom Bossert, a homeland security adviser to President Donald Trump, said "criminals" were responsible, not the USA government.
"The truth is, if you're going to cut infrastructure budgets and if you're not going to allow the NHS to invest in upgrading its IT, then you are going to leave hospitals wide open to this sort of attack", he added.
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