Russian oil company Rosneft hit by cyberattack

Russian oil company Rosneft hit by cyberattack

Russian oil company Rosneft hit by cyberattack

The Petya virus has also attacked the Ukrainian government, Auchan Hypermarkets, Privatbank and telecommunication operators, the Group-IB company said.

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.

"Neither the production process, nor mining and preparation of oil were stopped", the company said on Twitter.

Rosneft spokesman Mikhail Leontyev said the arrested shares could no longer be bought or sold and were in equal in value to the oil company's claim.

The cyberattack targeted a number of oil, telecommunications and financial companies in Russian Federation and Ukraine, blocking computers and demanding 300 US dollars in bitcoins, Group-IB told Russia's Prime news agency.

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Sechin said last week that Rosneft was working on a new strategy which it would present by the end of this year, Reuters reported.

Rosneft's website was unavailable in Moscow as of 13:25 GMT and had been offline for at least an hour before that.

A powerful cyber attack has spread across the globe, hitting some of the world's biggest companies.

One of the victims of Tuesday's cyber attack, a Ukrainian media company, said its computers were blocked and it had received a demand for $300 worth of the Bitcoin crypto-currency to restore access to its files.

"As a result of these cyber attacks these banks are having difficulties with client services and carrying out banking operations", the central bank said in a statement.

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