WannaCry infected some 300,000 computers in 150 nations in May, encrypting user files and demanding hundreds of dollars from their owners for the keys to get them back.
Cyber criminals are poised to step up their attacks on the millions of devices now connected to the Internet of Things both in offices and homes.
The alert, issued on Cyber Swachhta Kendra, said it has been reported that a new wave of spam mails is circulating with common subject lines to spread variants of Locky Ransomware.
Operations at the terminal of the nation's largest container port Jawaharlal Nehru Port Trust (JNPT) were impacted Tuesday night as a fallout of the global ransomware attack, which crippled some central banks and many large corporations in Europe.
The new cyber attack started massively affecting dozens of companies and institutions in the world, beginning with Russia and Ukraine on Tuesday, and now spreading to Asia and Australia on Wednesday.
"What we have seen now is only the tip of the iceberg," the IT Security officer cautioned.
Researchers discovered a new attack linked to WannaCry called 'Adylkuzz' which will infect the computers to transfer the money created to the authors of the virus.
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