https://consumerist.com/2017/10/06/report-russian-hackers-stole-nsa-data-by-using-kaspersky-software/

For months, government agencies have been warning that popular antivirus software could be giving Russian intelligence agencies a back door into American computers and secrets. Now a new report says not only that it could happen, but that it already has, at least once.

The Wall Street Journal reports that hackers working for the Russian government were able to access “highly classified” National Security Agency documents after a worker for the agency opened them on a computer using Kaspersky products.