The Sony Cyber attack must be the most widely covered cyber attack ever in the history of such attacks, it started off in November 2014 when staff at Sony had images appear on the computers featuring Skeletons with threatening notices. This caused major disruptions and Sony staff have had to work on white boards and paper. Allegations have been made against North Korea that they have organized or at least part funded this by many to include members of the White house because of the release of Sony Pictures film ‘The Interview’. Sony stopped the showing of the film, then decided to show it again. President Obama says the U.S. will ‘respond proportionally’ to North Korea’s cyber attack on Sony Pictures.
For full details see Sony Cyber Attack