Hackers threaten stock market

Cyber security experts said the spread of the worm dubbed WannaCry - "ransomware" that locked up more than , computers in more than countries - had slowed but that the respite might only be brief amid fears new versions of the worm will strike. In a blog post on Sunday, Microsoft President Brad Smith appeared to tacitly acknowledge what researchers had already widely concluded: The ransomware attack leveraged a hacking tool, built by the U.

National Security Agency, that leaked online in April. He also poured fuel on a long-running debate over how government intelligence services should balance their desire to keep software flaws secret - in order to conduct espionage and cyber warfare - against sharing those flaws with technology companies to better secure the internet.

He added that governments around the world should "treat this attack as a wake-up call" and "consider the damage to civilians that comes from hoarding these vulnerabilities and the use of these exploits.

The NSA and White House did not immediately respond to requests for comment about the Microsoft statement.

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Economic experts offered differing views on how much the attack, and associated computer outages, would cost businesses and governments. Most victims were quickly able to recover infected systems with backups, said the group's chief economist, Scott Borg.

President Donald Trump on Friday night ordered his homeland security adviser, Tom Bossert, to convene an "emergency meeting" to assess the threat posed by the global attack, a senior administration official told Reuters. The investigations into the attack were in the early stages, however, and attribution for cyber attacks is notoriously difficult.

The original attack lost momentum late on Friday after a security researcher took control of a server connected to the outbreak, which crippled a feature that caused the malware to rapidly spread across infected networks.

Infected computers appear to largely be out-of-date devices that organizations deemed not worth the price of upgrading or, in some cases, machines involved in manufacturing or hospital functions that proved too difficult to patch without possibly disrupting crucial operations, security experts said. Microsoft released patches last month and on Friday to fix a vulnerability that allowed the worm to spread across networks, a rare and powerful feature that caused infections to surge on Friday.

Code for exploiting that bug, which is known as "Eternal Blue," was released on the internet last month by a hacking group known as the Shadow Brokers. The head of the European Union police agency said on Sunday the cyber assault hit , victims in at least countries and that number would grow when people return to work on Monday.

Monday was expected to be a busy day, especially in Asia, which may not have seen the worst of the impact yet, as companies and organizations turned on their computers. Renault said it halted manufacturing at plants in France and Romania to prevent the spread of ransomware.

Other victims include is a Nissan manufacturing plant in Sunderland, northeast England, hundreds of hospitals and clinics in the British National Health Service, German rail operator Deutsche Bahn and international shipper FedEx Corp. A Jakarta hospital said on Sunday that the cyber attack had infected computers, disrupting the registration of patients and finding records.

The threat receded over the weekend after a British-based researcher, who declined to give his name but tweets under the profile MalwareTechBlog, said he stumbled on a way to at least temporarily limit the worm's spread by registering a web address to which he noticed the malware was trying to connect.

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Security experts said his move bought precious time for organizations seeking to block the attacks. Additional reporting by Jim Finkle, Neil Jerome Morales, Masayuki Kitano, Kiyoshi Takenaka, Jose Rodriguez, Elizabeth Piper, Emmanuel Jarry, Orathai Sriring, Jemima Kelly, Alistair Smout, Andrea Shalal, Jack Stubbs, Antonella Cinelli, Kate Holton, Andy Bruce, Michael Holden, David Milliken, Tim Hepher, Luiza Ilie, Patricia Rua, Axel Bugge, Sabine Siebold, Eric Walsh, Engen Tham, Fransiska Nangoy, Soyoung Kim, Mai Nguyen and Nick Zieminski; Editing by Mark Heinrich and Peter Cooney.

TOKYO Honda Motor Co said on Wednesday it halted production at a domestic vehicle plant for a day this week after finding the WannaCry ransomware that struck globally last month in its computer network.

Reuters is the news and media division of Thomson Reuters.

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