"In some of the companies, the work has been completely paralysed - servers and workstations are encrypted", head of Russian cyber-security firm Group-IB, Ilya Sachkov, told the TASS news agency.
"It also counted state institutions and strategic objects in Ukraine as its victims", Group-IB said of the attack on media outlets on its Telegram channel.
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Its website showed air traffic going in and out of the Black Sea resort city according to schedule.
It had still not resumed service by 11:00 pm and its internet site remained inaccessible. "However we can not confirm it is related to [NotPetya]".
At the end of June, an attack on the rançongiciel (ransomware), which is caused by the computer virus NotPetya and which had started in Russian Federation and Ukraine, had affected thousands of computers around the world. "We also see similar attacks in the Ukraine, Turkey, Germany, but their number is significantly lower, "said Kaspersky Lab, in a press release sent to AFP, adding that the virus" is spreading through the Russian sites infected ".
A spokesman for the company said: 'What is known at the moment is that Bad Rabbit ransomware has infected several big Russian media outlets, with Interfax news agency and Fontanka.ru among the confirmed victims of the malware. Based on our investigation, this is a targeted attack against corporate networks, using methods similar to those used in the ExPetr attack.
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Despite this, the Blues sit in the top four of the Premier League, but they are nine points behind current pace-setters Manchester City .
But there appeared to be some initial confusion about the nature of the new cyber threat facing Europe.
Analysis is just starting on this latest wave of attacks, but ESET researchers have determined that the code used in the Ukraine attacks incorporates Mimikatz as a tool to extract credentials, and that it spreads via fake Flash updates.
But the Security Service of Ukraine (SBU) said its IT experts detected a phishing attack that attempted to obtain sensitive personal details such as passwords through emails.
The US software giant issued no immediate comment.
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