“On Wednesday, June 26th, our security team detected an irregularity in TeamViewer’s internal corporate IT environment,” TeamViewer said in its initial update. “We immediately activated our response team and procedures, started investigations together with a team of globally renowned cyber security experts and implemented necessary remediation measures.”

The company assured users that “TeamViewer’s internal corporate IT environment is completely independent from the product environment” and emphasized that “there is no evidence to suggest that the product environment or customer data is affected.”

TeamViewer assembled a task force consisting of internal security personnel and “globally leading cybersecurity experts” to investigate the incident.  The investigation, revealed in a later update, attributed the attack to the APT29 threat group, also known as “Midnight Blizzard.”