Anne Neuberger, the White House’s deputy national security advisor for cyber and emerging technology, said that the US has “technical information that links the Russian Main Intelligence Directorate (GRU)” with the DDoS attack that had overloaded and brought down the Ukrainian websites.
“GRU infrastructure was seen transmitting high volumes of communication to Ukraine-based IP addresses and domains,” she told journalists on February 18. It’s believed that the cyberattack was meant to sow panic in Ukraine as over 150,000 Russian troops massed at the border.
Source: The US is unmasking Russian hackers faster than ever | MIT Technology Review