An adviser to Ukraine's interior minister said a version of the "WannaCry" ransomware had caused outages on government websites and those of several companies, a cyberattack he called the worst in Ukraine's history.
Adviser Anton Gerashchenko said Ukrainian IT systems had been targeted with "Cryptolocker" a version of WannaCry, the virus that locked up more than 200,000 computers in more than 150 countries in May.
"The ultimate goal of the cyberattack was to try to destabilise," he wrote in a post on Facebook in which he said the attacks probably originated from Russia.
Ukrainian Prime Minister Volodymyr Groysman said a wave of cyberattacks on Ukrainian state institutions and companies on Tuesday was "unprecedented" but had not hit "important" IT systems.
"It was an unprecedented attack, but our IT experts are doing their work and protecting strategic infrastructure. Important systems have not been affected," he said in a post on Facebook.
