June 28 (UPI) -- Russian oil producer Rosneft, one of the first to admit its systems were hit by Tuesday's cyberthreat, said production was unaffected by the attack.
Rosneft said Wednesday its operations were proceeding as usual after it switched over to a reserve control system following a cyberattack that swept across most of Europe.
"The company works as usual [and] the situation is under control," it said through its official Twitter account. "It is premature to evaluate the cyber attack impact."
The large scale hacker attack has not affected the Company production processes. There are particular issues, that are resolved promptly.
— Rosneft (@RosneftEN) June 28, 2017
The ransomware cyberattack from the so-called Petya or NotPetya bug targeted thousands of government and private corporate servers across the globe Tuesday. The attack demanded a $300 ransom paid in Bitcoin to release the encryption imposed by the virus that prevents users from accessing their devices.
"Neither oil production nor preparation processes were stopped," Rosneft said.
Cybereason principal security researcher Amit Serper said Wednesday it had developed a vaccine that works on Microsoft's Windows operating system.
Ukrainian energy companies Ukrenergo and Kyivenergo were among other companies hit, as was Dutch shipping and energy company Maersk, which reported sites were down across multiple sites and businesses due to the cyberattack.
Russian security software firm Kaspersky said about 2,000 computers were affected. Dmitry Peskov, a spokesperson for Russian President Vladimir Putin, was quoted by Russian news agency Tass as saying Wednesday an attack of this proportion requires a global response.
"No single country can effectively counter cyber threats single-handedly," he said.
The industry's certification body DNV GL estimates cybercrimes costs the energy and utilities sector about $12.8 million each year in lost business and equipment damage. A recent report from Ernst & Young found only 15 percent of the oil and gas companies it surveyed have fully considered cybersecurity in their strategic plans.
With crude oil prices putting a squeeze on corporate spending, Ernst & Young said last year that oil and gas companies have little leeway on where they put their financial focus.
