According to Wikileaks, CIA agents have managed to hack Samsung smart TVs with malware called Weeping Angel.
The app was created during a joint workshop with the agency’s British counterparts, MI5, in 2014. Weeping Angel runs just like a normal TV app, but in the background, capturing audio but not video. It can, however, also recover the Wi-Fi keys the TV uses to later hack the target’s Wi-Fi network, and access any usernames and passwords stored on the TV browser.
There is also a feature dubbed Fake Off where the TV would continue recording even when it appears to be shut down.