An equivalent scenario with conventional weapons would be the US military having some of its Tomahawk missiles stolen," Smith wrote.England's National Health Service said 47 organisations providing care had been hit and on Sunday afternoon seven hospitals were continuing to divert patients from the emergency room.European policing and security agencies said the fallout from a ransomware attack could deepen as people return for another work week.The warning was echoed by Britain's National Cyber Security Centre: "As a new working week begins it is likely, in the UK and elsewhere, that further cases of ransomware may come to light, possibly at a significant scale.

Germany's rail operator Deutsche Bahn said its station display panels were affected.Security firm Digital Shadows said on Sunday that transactions totalling $32,000 had taken place through Bitcoin addresses used by the ransomware.He warned governments against stockpiling such vulnerabilities and said instead they should report them to manufacturers -- not sell, store or exploit them, lest they fall into the wrong hands."'Ooops' message, $300 ransom The attack looks like this: images appear on victims' screens demanding payment of $300 (275 euros) in the virtual currency Bitcoin, saying: "Ooops, your files have been encrypted!"Payment is demanded within three days or the price is doubled, and if none is received within seven days the locked files will be deleted, according to the screen message.

Bitcoin, the world's most-used virtual currency, allows anonymous transactions via heavily encrypted codes.Brad Smith, Microsoft's president and chief legal officer, said in a blog post Sunday that it was in fact the NSA that developed the code being used in the attack.European policing and security agencies said the fallout from a ransomware attack that has already crippled more than 200,000 computers around the world could deepen as people return for another work week.Banks, trains and automobilesSymantec said the majority of organisations affected were in Europe.The attack therefore spread faster than previous, smaller-scale ransomware attacks.

The indiscriminate attack began Friday and struck banks, hospitals and government agencies, exploiting known vulnerabilities in older Microsoft computer operating systems."I'm worried about how the numbers will continue to grow when people go to work and turn on their machines on Monday," he said.A hacking group called Shadow Brokers released the malware in April, claiming to have discovered the flaw from the NSA, Kaspersky said.. A computer technician connects a computer into a network server in an office building in Washington, DC on May 13, 2017 Governments and computer experts girded Monday for a possible worsening of the global cyberattack that has hit more than 150 countries, as Microsoft warned against stockpiling vulnerabilities like the one at the heart of the crisis."

The attack is unique, according to Europol, because it combines ransomware with a worm function, meaning once one machine is infected, the entire internal network is scanned and other vulnerable machines are infected.Experts and governments alike warn against ceding to the demands and Wainwright said few victims so far had been paying up.

The culprits used a digital code believed to have been developed by the US National Security Agency # -- and subsequently leaked as part of a document dump, according to researchers at the Moscow-based computer security firm Kaspersky Lab.We've never seen anything like this," the head of the European Union's policing agency told Britain's ITV television, calling its reach "unprecedented"."

The governments of the world should treat this attack as a wake up call.Europol's Wainwright said few banks in Europe had been affected, having learned through the "painful experience of being the number one target of cyber crime" the value of having the latest cyber security in place.US package delivery giant FedEx, European car factories, Spanish telecoms giant Telefonica, Britain's health service and Germany's Deutsche Bahn rail network were among those hit.Europol executive director Rob Wainwright said the situation could worsen on Monday when workers return to their offices after the weekend and log on.Universities in China, Italy and Greece were also hit.Wainwright described the cyberattack as an "escalating threat"

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