KIEV, June 29 – Phishing and updates of the popular M.E.Doc software (reports to Ukraine's Fiscal Service, electronic correspondence) were the main two means used by the new Petya virus, which infected hundreds of Ukrainian companies and banks, the cyber police unit of Ukraine's National Police said on its Facebook page on June 28.

"We are not accusing M.E.Doc, just stating facts, which should be re-checked. We recommend not updating [M.E.Doc] software in the interim," the cyber police unit said.