He said it was highly likely the attack had exploited the NSA hacking tool and he expected the outbreak to be reported in the Americas soon, as workers turned on vulnerable machines, allowing the virus to attack.
Earlier, Wannacry ransomware hit the countries in Europe including some institutions in Indian states of Kerala and Karnataka too.
Russian news agency TASS said Bashneft, Mars, Nivea, Mondelez International and other Russian companies were also affected.
Meanwhile, Maersk, based in Denmark, has confirmed its systems are down due to a cyberattack, and even Russian oil company Rosneft has been affected.
The Chernobyl nuclear power plant is among the sites hit by a new malicious data-scrambling cyber attack which has hit government, businesses, banks and airports across Europe and the UK.
It's only been a little over a month since the WannaCry ransomware wreaked havoc worldwide, with infections hitting over 150 countries and hundreds of millions of computer systems. Ukrainian interior minister advisor Anton Gerashchenko is calling it the largest cyberattack in the history of the country.
The cryptolocker demands $300 in bitcoins and does not name the encrypting program, which makes finding a solution hard, said Group IB spokesman Evgeny Gukov in an emailed comment. The National Bank said an "unknown virus" is spreading through its computers, and Deputy Prime Minister Pavlo Rozenko said his computer, like others in the Ukrainian government, was inaccessible.
Russia's Rosneft oil company also reported falling victim to hacking, as did Danish shipping giant A.P. Moller-Maersk.
Conner said it is important every business have a plan in place in the event of a cyber-attack because the onset of these type of attacks are just beginning. As reported, once a computer is infected, it will instruct its user to pay a fine to a static Bitcoin address, after which the bitcoin wallet and personal ID should be emailed to a Posteo address. In Germany, postal and logistics company Deutsche Post said systems of its Express division in the Ukraine have, in part, been disrupted.
When asked if the latest attacks had affected systems in India, CERT-In Director General Sanjay Bahl said he was not aware of it now.
British advertising group WPP said its computer networks in several locations had been targeted.