The apparent cyberattack came amid days of protests over the death of a woman who was detained by the country's morality police for allegedly wearing her Islamic headscarf too loosely.
The United States supported the move by Albania, a NATO member, and vowed unspecified retaliation against Iran for what it called “a troubling precedent for cyberspace.”
In 2018, an Israeli-American was jailed for 10 years by a court in Israel for making about 2,000 hoax threats in North America, Britain, Australia, New Zealand, Norway and Denmark.
"The onerous nature of the requirements may also make it more difficult for companies to do business in India," the letter said.
It did not elaborate or name specific examples of public sector agencies, organizations or services but said the incidents happened in recent days.
The hack was one of the biggest to hit the crypto world, raising huge questions about security in an industry that only recently burst into the mainstream.
The minister also said that action was taken back in 2018 against suspected cyber attacks on the country's power supply system.
The wide-ranging attack affected users from Poland to France, getting quick notice by knocking off remote access to thousands of wind turbines in central Europe.
Nandan Kumar, a software engineer, shared details of his hacking in a twitter thread addressed to Indigo stating that there was 'a hole (technical vulnerability) in your system.'
IT experts identified the virus as "Petrwrap", a modified version of the Petya ransomware which hit last year and demanded money from victims in exchange for the return of their data.
The virus is usually covertly installed on to computers by hiding within emails containing links, which users are tricked into opening.
Russian health ministry aide Nikita Odintsov said on Twitter that the ministry had quickly thwarted the attempted attacks.
Friday's wave of cyberattacks apparently exploited a flaw exposed in documents leaked from the US National Security Agency.
The hunt was on for the culprits behind the assault, which was being described as the biggest cyber ransom attack ever.