https://www.cnbc.com/2017/10/10/israeli-spies-found-russians-using-kaspersky-software-for-hacks.html

Israeli intelligence officials spying on Russian government hackers found they were using Kaspersky Lab antivirus software that is also used by 400 million people globally, including U.S. government agencies, according to media reports on Tuesday.

The Israeli officials who had hacked into Kaspersky's network over two years ago then warned their U.S. counterparts of the Russian intrusion, said The New York Times, which first reported the story.