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Like the WannaCry attacks in May, the latest global hacking took control of computers and demanded digital ransom from their owners to regain access. The new attack used the same National Security Agency hacking tool, Eternal Blue, that was used in the WannaCry episode, as well as two other methods to promote its spread, according to researchers at the computer security company Symantec.

The National Security Agency has not acknowledged its tools were used in WannaCry or other attacks. But computer security specialists are demanding that the agency help the rest of the world defend against the weapons it created.

The N.S.A. needs to take a leadership role in working closely with security and operating system platform vendors such as Apple and Microsoft to address the plague that theyve unleashed, said Golan Ben-Oni, the global chief information officer at IDT, a Newark-based conglomerate hit by a separate attack in April that used the agencys hacking tools. Mr. Ben-Oni warned federal officials that more serious attacks were probably on the horizon.

The vulnerability in Windows software used by Eternal Blue was patched by Microsoft in March, but as the WannaCry attacks demonstrated, hundreds of thousands of groups around the world failed to properly install the fix.

Just because you roll out a patch doesnt mean itll be put in place quickly, said Carl Herberger, vice president for security at Radware. The more bureaucratic an organization is, the higher chance it wont have updated its software.

Because the ransomware used at least two other ways to spread on Tuesday including stealing victims credentials even those who used the Microsoft patch could be vulnerable and potential targets for later attacks, according to researchers at F-Secure, a Finnish cybersecurity firm, and others.

A Microsoft spokesman said the companys latest antivirus software should protect against the attack.

Governments and companies in Europe and the United States have been impacted. Here are several:

The Ukrainian government said several of its ministries, local banks and metro systems had been affected. A number of other European companies, including Rosneft, the Russian energy giant; Saint-Gobain, the French construction materials company; and WPP, the British advertising agency, also said they had been targeted.

Ukrainian officials pointed a finger at Russia on Tuesday, although Russian companies were also affected. Home Credit bank, one of Russias top 50 lenders, was paralyzed, with all of its offices closed, according to the RBC news website. The attack also affected Evraz, a steel manufacturing and mining company that employs about 80,000 people, the RBC website reported.

In the United States, the multinational law firm DLA Piper also reported being hit. Hospitals in Pennsylvania were being forced to cancel operations after the attack hit computers at Heritage Valley Health Systems, a Pennsylvania health care provider, and its hospitals in Beaver and Sewickley, Penn., and satellite locations across the state.

The ransomware also hurt Australian branches of international companies. DLA Pipers Australian offices warned clients that they were dealing with a serious global cyber incident and had disabled email as a precautionary measure. Local news reports said that in Hobart, Tasmania, on Tuesday evening, computers in a Cadbury chocolate factory, owned by Mondelez International, had displayed ransomware messages that demanded $300 in bitcoins.

Qantas Airways booking system failed for a time on Tuesday, but the company said the breakdown was due to an unrelated hardware issue.

The Australian government has urged companies to install security updates and isolate any infected computers from their networks.

This ransomware attack is a wake-up call to all Australian businesses to regularly back up their data and install the latest security patches, said Dan Tehan, the cybersecurity minister. We are aware of the situation and monitoring it closely.

A National Security Agency spokesman referred questions about the attack to the Department of Homeland Security. The Department of Homeland Security is monitoring reports of cyberattacks affecting multiple global entities and is coordinating with our international and domestic cyber partners, Scott McConnell, a department spokesman, said in a statement.

Computer specialists said the ransomware was very similar to a virus that emerged last year called Petya. Petya means Little Peter, in Russian, leading some to speculate the name referred to Sergei Prokofievs 1936 symphony Peter and the Wolf, about a boy who captures a wolf.

Reports that the computer virus was a variant of Petya suggest the attackers will be hard to trace. Petya was for sale on the so-called dark web, where its creators made the ransomware available as ransomware as a service a play on Silicon Valley terminology for delivering software over the internet, according to the security firm Avast Threat Labs.

That means anyone could launch the ransomware with the click of a button, encrypt someones systems and demand a ransom to unlock it. If the victim pays, the authors of the Petya ransomware, who call themselves Janus Cybercrime Solutions, get a cut of the payment.

That distribution method means that pinning down the people responsible for Tuesdays attack could be difficult.

The attack is an improved and more lethal version of WannaCry, said Matthieu Suiche, a security researcher who helped contain the spread of the WannaCry ransomware when he created a kill switch that stopped the attacks.

In just the last seven days, Mr. Suiche noted, WannaCry had tried to hit an additional 80,000 organizations but was prevented from executing attack code because of the kill switch. Petya does not have a kill switch.

Petya also encrypts and locks entire hard drives, whereas the earlier ransomware attacks locked only individual files, said Chris Hinkley, a researcher at the security firm Armor.

The hackers behind Petya demanded $300 worth of the cybercurrency Bitcoin to unlock victims machines. By Tuesday afternoon, online records showed that 30 victims had paid the ransom, although it was not clear whether they had regained access to their files. Other victims may be out of luck, after Posteo, the German email service provider, shut down the hackers email account.

In Ukraine, people turned up at post offices, A.T.M.s and airports to find blank computer screens, or signs about closures. At Kievs central post office, a few bewildered customers milled about, holding parcels and letters, looking at a sign that said, Closed for technical reasons.

The hackers compromised Ukrainian accounting software mandated to be used in various industries in the country, including government agencies and banks, according to researchers at Cisco Talos, the security division of the computer networking company. That allowed them to unleash their ransomware when the software, which is also used in other countries, was updated.

The ransomware spread for five days across Ukraine, and around the world, before activating Tuesday evening.

If I had to guess, I would think this was done to send a political message, said Craig Williams, the senior technical researcher at Talos.

One Kiev resident, Tetiana Vasylieva, was forced to borrow money from a relative after failing to withdraw money at four automated teller machines. At one A.T.M. in Kiev belonging to the Ukrainian branch of the Austrian bank Raiffeisen, a message on the screen said the machine was not functioning.

Ukraines Infrastructure Ministry, the postal service, the national railway company, and one of the countrys largest communications companies, Ukrtelecom, had been affected, Volodymyr Omelyan, the countrys infrastructure minister, said in a Facebook post.

Officials for the metro system in Kiev said card payments could not be accepted. The national power grid company Kievenergo had to switch off all of its computers, but the situation was under control, according to the Interfax-Ukraine news agency. Metro Group, a German company that runs wholesale food stores, said its operations in Ukraine had been affected.

At the Chernobyl plant, the computers affected by the attack collected data on radiation levels and were not connected to industrial systems at the site, where, although all reactors have been decommissioned, huge volumes of radioactive waste remain. Operators said radiation monitoring was being done manually.

Cybersecurity researchers questioned whether collecting ransom was the true objective of the attack.

Its entirely possible that this attack could have been a smoke screen, said Justin Harvey, the managing director of global incident response at Accenture Security. If you are an evildoer and you wanted to cause mayhem, why wouldnt you try to first mask it as something else?

An earlier version of this article referred incorrectly to the occupation of Justin Harvey. He is the managing director of global incident response at Accenture Security, not the chief security officer for the Fidelis cybersecurity company.

Reporting was contributed by Liz Alderman, Andrew E. Kramer, Iuliia Mendel, Ivan Nechepurenko and Isabella Kwai.

A version of this article appears in print on June 28, 2017, on Page A1 of the New York edition with the headline: A Cyberattack Hits Ukraine, Then Spreads.

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Cyberattack Hits Ukraine Then Spreads Internationally - The ...