Wannacry encrypts the files on infected Windows system and spreads by exploiting vulnerabilities, it said.
He added: "Although we have never seen anything on this scale when it comes to ransomware attacks, they are relatively common and there are things that you can do, that everyone can do, all of us can do, to protect ourselves against them".
Japanese companies said Monday they were working to overcome the problems caused by cyberattack.
NHS England said that, as of 3pm on Monday, two hospitals remained on divert following the attack, down from seven on Sunday. The company said the virus has been localized and "technical work is underway to destroy it and update the antivirus protection".More news: Explaining the mechanics of the Trump-Russia special counsel
The initial attack, known as "WannaCry, " paralyzed computers that run Britain's hospital network, Germany's national railway and other companies and government agencies worldwide in what's believed to be the biggest online extortion scheme ever.
The virus exploits a vulnerability in Microsoft Windows software, first identified by the US National Security Agency, experts have said.
Shadow health secretary Jonathan Ashworth, in a letter to Mr Hunt, said concerns were repeatedly flagged about outdated computer systems.
Urging businesses and computer users to keep their systems current and updated, Smith says the WannaCry attack shows the importance of collective action to fight cyber crime.More news: Laptop ban on global flights into the US still being discussed
Following a meeting of the Government's Cobra contingencies committee, Home Secretary Amber Rudd said more than a million patients had been treated in the course of Monday.
The impact of WannaCry ransomware attack has been limited to five or six isolated instances so far and there are no reports of any substantial disruption to Indias IT backbone, the government said today.
The spokesman played down suggestions the NHS was placed at additional risk because of its use of Windows XP. The assault infected computer networks around the world, its perpetrators unknown and its goal uncertain, although it may have been nothing more than an attempt to extract money from its victims.
Telefónica: Spanish authorities confirmed the Spanish telecom company Telefónica was one of the targets, though the attack affected only some computers and did not compromise the security of clients' information.More news: Saudi to sign trade, political deals with US
An executive at a cybersecurity firm that helped block a global ransomware attack says new variations of the malicious worm are circulating and researchers expect one to develop that can't be stopped.
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