Ukraine secret service announces joint investigation with Europol, FBI, and NCA to attribute the recent Notpetya massive attack. Ukraine is the country with the largest number of NotPetya infections. Researchers believe that hackers infected software update to a Ukrainian tax accounting system called MeDoc, but MeDoc denies the allegations. Microsoft now has evidence that a few active infections of the ransomware initially started from the legitimate MEDoc updater process. Microsoft has evidence. Microsoft believes infection appears to involve a software supply-chain threat involving the Ukrainian company M.E.Doc.”]
Source: http://securityaffairs.co/wordpress/60562/intelligence/sbu-investigation-notpetya.html