A major cyber-attack dubbed "Petya" hit central banks and many large corporations in Europe, the Middle-East and the U.S., creating havoc for employees and customers alike.
The malware, which has been dubbed NotPetya, has been confirmed by multiple security firms to resemble the WannaCry ransomware attack, which in May infected hundreds of thousands of computers by taking advantage of a National Security Agency hacking tool called Eternal Blue.
Rosneft said its servers had suffered a "powerful" cyberattack but thanks to its backup system "the production and extraction of oil were not stopped".
In Ukraine, Boryspil airport, the banking system, a state power distributer and even the Ukrainian government have been hit, Engadget said.
Other companies that said they had been hit by a presumed cyber attack included Russian metal maker Evraz, French construction materials firm Saint Gobain and the world's biggest advertising agency, WPP - though it was not clear if their problems were caused by the same virus. A spokesman for the company said that " They are continuing to investigate and take appropriate action to protect their customers".
Other victims of the attack were spread across countries including Britain, France, Germany, Italy, Poland and the United States. In last month more than 3,00,00 computers infected with this virus.
A new wave of ransomware attacks swept the world on Tuesday, starting with Ukraine and spreading to other regions of the world.
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Infected computers display a message demanding a Bitcoin ransom worth $300.
"The actual number of vulnerable PCs is probably much higher", Jakub Krostek, Avast's Threat Lab Team lead, said.
Security experts also believe that this new ransomware does not have a kill switch, which means that it might be harder to stop.
There's very little information about what might be behind the disruption at each specific company, but cybersecurity experts rapidly zeroed in on a form of ransomware, the name given to programs that hold data hostage by scrambling it until a payment is made.
Ukrainian Prime Minister Volodymyr Groysman wrote on Facebook that the attacks in his country were "unprecedented" but insisted that "important systems were not affected".
Security experts, including Mr Savvides, are now urging people and businesses to ensure all computers are up to date with Microsoft patches. The £3billion aircraft carrier HMS Queen Elizabeth, which set sail on Monday, has a computer in its control room running on Windows XP - the system hit by a cyber attack in May.
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.
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United States government preparing to help victims of the fresh cyber attack Food company Mondelez International also said its staff in different regions were experiencing technical problems. Although no one knows yet who's behind the attack, some are comparing it to the WannaCry cyberattacks from May.
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