TeamViewer, a German software company specializing in remote access and desktop sharing software, suffered an attack in 2016. According to the company, the attack was discovered and stopped at the time, with no evidence of damage or compromise found. The attackers used Winnti, a backdoor Trojan known to have been developed and used by groups located in China. The software is considered a reliable indicator that the attack originated within China, according to a report from Der Spiegel. The company stopped the activity before any damage occurred.”]
Source: https://www.darkreading.com/attacks-breaches/teamviewer-admits-breach-from-2016