Russian hackers attacks Microsoft to spy on the Ukraine-NATO

A group of Russians Hackers took advantage of a trick in Microsoft  were not discovered  to spy on the Ukrainian government and NATO officials, according to new reports, security researchers published.
 The hackers used a deception e-mail messages containing malicious attachments,and they  are files especially familiar applications such as "PowerPoint" to target several victims in Europe and the United States, according to the report published by the company "I site" a digital security specialized company.
 The researchers believe that the source of the attacks is the russian hackers depending on a range of information such as the effects of the intended victims and many  other effects that the attackers had left.
On the other hand, "Alice Gustav" a security researcher  from the company "Kaspersky" said  in a statement to the website "Mashable", it is very difficult to prove that Russia was behind the attack, or that the hackers are even Russian, and added that the evidence is not enough to confirm that.  
Commenting on this, Microsoft said in a statement it plans to fix the gap within a few days. According to the "I site" the Microsoft were not known of this trick before.