Britain's National Cyber Security Centre and its National Crime Agency were looking into the United Kingdom incidents, which disrupted care at National Health Service facilities, forcing ambulances to divert and hospitals to postpone operations.
All told, several cybersecurity firms said they had identified the malicious software in upwards of 60 countries, including the United States - though its effects in the US did not appear to be widespread, at least in the initial hours.
No Bangladesh government websites or data centers or any other infrastructure faced any problem after the global cyber attack, which infected computers in almost 100 countries on Friday. He said he "promptly" registered the domain, something he regularly does to try to discover ways to track or stop malicious software.
British Home Secretary Amber Rudd said Saturday that 45 public health organizations were hit, but she stressed that no patient data had been stolen.
The cyber-extortion attack known as WannaCry spread quickly around the world due to some unusual factors coming together.
"For so many organizations in the same day to be hit, this is unprecedented", Wysopal said. Europol, the European Union's police agency, said the onslaught was at "an unprecedented level and will require a complex worldwide investigation to identify the culprits".
French carmaker Renault's assembly plant in Slovenia halted production after it was targeted. The state-owned oil company Petrobras and Brazil's Foreign Ministry also disconnected computers as a precautionary measure, and court systems went down, too.
A spokesman for the Russian Health Ministry, Nikita Odintsov, said on Twitter that the cyberattacks on his ministry were "effectively repelled".
Britain's National Health Service said hospitals across England were hit by an apparent "ransomware" attack, but there was no immediate evidence that patient data had been accessed.
He said the same thing could be done to crucial infrastructure, like nuclear power plants, dams or railway systems.
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The malicious software behind the onslaught appeared to exploit a vulnerability in Microsoft Windows that was supposedly identified by the National Security Agency for its own intelligence-gathering purposes and was later leaked to the Internet.
The central bank's IT attack monitoring centre "detected mass distribution of harmful software" but no "instances of compromise", it said.
NSA Director Adm. Mike Rogers, who also heads U.S. Cyber Command, warned Washington lawmakers Tuesday that America's enemies in the cyberspace realm "have grown more sophisticated and assertive" - especially Russian Federation, which has increasingly attempted to undermine democracies across the world through cyberattacks.
Pictures posted on social media showed screens of NHS computers with images demanding payment of $300 worth of the online currency Bitcoin, saying: "Ooops, your files have been encrypted!" Computers already affected will not be helped by the solution.
The security holes it exploits were disclosed weeks ago by TheShadowBrokers, a mysterious group that published what it said are hacking tools used by the NSA.
British media had reported past year that most public health organizations were using an outdated version of Microsoft Windows that was not equipped with security updates. Dr Krishna Chinthapalli, a neurology registrar atthe National Hospital for Neurology and Neurosurgery in London, had warned that an increasing number of hospitals could be shut down by ransomeware attacks inan article on the vulnerability of the NHS network in the "British Medical Journal" on Wednesday, two days before the major cyberhack.
Spain's Telefonica, a global broadband and telecommunications company, was among the companies hit.
In March Microsoft itself advised its customers about the attack and released a software update for Windows 10, said Barkatullah.
Security experts said the attack appeared to be caused by a self-replicating piece of software that enters companies and organizations when employees click on email attachments, then spreads quickly internally from computer to computer when employees share documents. The national railway system said that although it was attacked, rail network operations were unaffected.
Germany's national railway says departure and arrival display screens at its stations were affected Friday night, but there was no impact on train services.
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