The infections have disabled more than a dozen hospitals in the United Kingdom, Spain's largest telecom company and universities in Italy as well as some FedEx computers.
The servers of the ministry have not been affected, Volk added, saying it's operated by different systems for Russia-developed data processing machines.
East Cheshire NHS Trust runs Macclesfield District General Hospital as its main site as well as Knutsford Community Hospital, and other outpatient services in Knutsford, Handforth and Wilmslow. Apparently, every company or organization did not install the critical security update.
Friday's attack exploited vulnerabilities in some versions of Microsoft Windows. And because lives are at stake, he thinks hospitals may be more likely to pay up.
"This is not targeted at the NHS, it's an global attack and a number of countries and organizations have been affected", British Prime Minister Theresa May said.
The statement added: "Local health and care organisations would like to reassure patients that should they need the NHS in an emergency situation that they should access services as they would normally".
She did not elaborate on how the six remaining health groups were affected or where they were located.
Iberdrola and Gas Natural, along with Vodafone's unit in Spain, asked staff to turn off computers or cut off Internet access in case they had been compromised, representatives from the firms said.
He also said that he thought it was unlikely the attackers had deliberately targeted the NHS.
The attack, which saw computers locked and users' files held for ransom, was believed to the biggest ever recorded.
Sometimes called a "wormable" vulnerability, it is considered very serious because of the speed at which worms can infect and jump from system to system, he said.
"It's going to happen more and more", he said.
Consumers who have up-to-date software are protected from this ransomware.
A number of hospitals in Britain have been hit by a large scale cyber attack, Guardian newspaper reported.
CHESHIRE and Wirral Partnership NHS Trust has confirmed that it is "experiencing significant IT disruptions" as it fights against a nationwide cyber-attack on the NHS.
Wikileaks also referred to its dealings with the whistleblower behind its Vault 7 Central Intelligence Agency releases who warned of the extreme proliferation risk in the creation of cyber weapons.
Data acquired by software firm Citrix under freedom of information laws suggested 90% of trusts were using Windows XP, then a 15-year-old system.
Microsoft says now it will make the fixes free for everyone.
The attacks apparently exploited a flaw exposed in documents leaked from the US National Security Agency (NSA).
A patch for the vulnerability was released by Microsoft in March, which would have automatically protected those computers with Windows Update enabled.
The malware used in the NHS attack is called WannaCry and attacks Windows operating systems.
Auto firm Nissan's Sunderland plant has been affected by the worldwide ransomware attack.
Renault representative Nevenka Basek Zildzovic confirmed that "some troubles occurred with some parts of IT system at Revoz".
The head of Slovenia's cyber emergency team, Gorazd Bozic, says seven individuals have also been targeted but no state institutions.
The two unionists spoke on condition of anonymity because of the sensitiveness of the issue.
The consequences for the company remained unclear.
"For so many organizations in the same day to be hit, this is unprecedented", he said.
Separately on Saturday, finance chiefs from the Group of Seven rich countries will commit to join forces to fight the growing threat of worldwide cyber attacks, according to a draft statement of a meeting they are holding in Bari, Italy.