This was announced by Interior Minister Arsen Avakov on Facebook, Censor.NET reports.
"Today [July 4 - ed.] special agents of Cyberpolice department together with Security Service of Ukraine officers and Kyiv city prosecutor's office employees stopped the second wave of the cyberattack that employed Petya malware. The peak of the attack was scheduled for 4 p.m. It started at 1:40 p.m. By 3 p.m. cyberpolice had blocked the mail campaign and activation of the virus from the servers of M.E. Doc system," Avakov wrote.
The minister added that the servers in question have been seized. He confirmed that possible sources of the attack might come from the Russian Federation.
On June 27-29, numerous Ukrainian companies, government agencies, and banks were attacked by a large-scale computer virus Petya.A.