Ratter

Ratter is a 2015 American found-footage horror thriller film written and directed by Branden Kramer in his feature debut. The film is based on a short film also written and co-directed by Kramer titled Webcam. It stars Ashley Benson and Matt McGorry.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.