Russia's top oil producer Rosneft said its servers had been hit been a large-scale cyber attack but its oil production was unaffected.
The terminal at JNPT handles 4,500 containers per day and plans are afoot to divert cargo to other two terminals within the port.
The Moscow-based cyber security firm Group IB traced the origins of the malware and the hackers to a code developed by the US National Security Agency (NSA) which was leaked and then used in the WannaCry ransomware attack that caused global disruption last month, according to an AFP report.
U.S. pharmaceutical company Merck said: "We confirm our company's computer network was compromised today as part of global hack".
A spokesman for France's state railway operator SNCF said their systems had been attacked, but there had been no impact on the company.
Two terminals in Rotterdam, one of Europe's busiest ports, have also been affected, Dutch broadcaster RTV Rijnmond reported on Tuesday.
Yevhen Dykhne, director of the capital's Boryspil Airport, said it had been hit.
In a lengthy statement posted to Facebook, MEDoc acknowledged having been hacked but said it was not responsible for having seeded the rogue program.
In Ukraine, victims included top-level government offices, where officials posted photos of darkened computer screens; energy companies; banks; and even cash machines, gas stations, and supermarkets.
While the FTSE 100 firm gave no more detail about how the business had been impacted, its website appeared to be down as it made the announcement. In particular, about serious problems reported by Reuters, the official representative of the British group WPP, the largest advertising Agency in the world.
In a statement, Maersk said Wednesday they "have shut down a number of systems to help contain the issue", while several entities including its oil, tankers and drilling activities "are not operationally affected".
"Cyber attacks can simply destroy us", said Kevin Johnson, chief executive of cyber security firm Secure Ideas.
"Maersk IT systems are down across multiple different sites and business units due to a cyber attack", said Concepcion Boo, a spokesperson for the company.
The ransomware is demanding a payment of $300 in Bitcoin to decipher the hacked files, as per the message showed on the system computers of the company.
It wasn't immediately clear if the cyberattack was related to the outbreak of malicious data-scrambling software that appears to be causing mass disruption across Europe Tuesday.