A massive cyberattack via a ransomware virus dubbed Petya has paralyzed dozens of businesses in Ukraine and neighboring Russian Federation, dpa cited state news agencies as reporting Tuesday.
Shares in Russian business conglomerate Sistema lost more than 10 percent in early trade in Moscow on Tuesday, after a Russian court arrested stakes in its three units late on Monday under a legal dispute with oil producer Rosneft.
The company later added it has notified law enforcement officials in connection with the cyber intrusion.
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Moscow-based cyber security firm Group IB said hackers had exploited code developed by the U.S. National Security Agency (NSA) which was leaked and then used in the WannaCry ransomware attack that caused global disruption in May. The company has asked Russia's security services to look into the issue.
Russian metals giant Evraz said its IT systems had been affected too, Russia's RIA news agency reported.
Bashkirian Power Grid has recommended a dividend for 2016 of 1.3 billion roubles.
Russia's leading oil producer said the attack "could have had serious consequences" but said that thanks to a back-up system "the production and extraction of oil were not stopped".
Deloitte said the oil and gas industry previous year was the second-most prone to attacks, with about 75 percent of the companies in the United States getting hit at least once.