Microsoft says it discovered hackers targeted democratic institutions in Europe, including think tanks and non-profits.
It happened between September and December 2018.
It affected over a hundred employees at the Council on Foreign Relations, The Aspen Institute, and The Marshall Fund in countries such as France, Germany, and Poland.
In most cases, hackers accessed employee credentials through spoofed email addresses with malicious links.
Microsoft said many of the attacks originated from a group called Strontium, which Microsoft associates with the Russian government.
Al Alper runs the security company, CyberGuard360:
(SOUNDBITE) (English) ABOLUTE LOGIC & CYBERGUARD360, PRESIDENT, AL ALPER, SAYING:
"The thing is, that because they are the number one software company in the world and everybody uses one or more of their applications, they are the easiest foil to use, and, so, they have to say it out loud, because it raises awareness, and, ultimately, the surest, the best line of defense, if you would, are an educated public, knowing what to be on the lookout for."
Microsoft said it plans to offer its cyber security service to new markets in Europe to help customers secure their accounts.