BU-123 Mueller

's report BU-123 refers to a section of Volume II, Part I of Robert Mueller's report on his investigation into Russian interference in the 2016 presidential election. The section is titled “Russian Hacking and Dumping Operations.” It focuses on evidence of the intelligence operations conducted by the Russian military intelligence agency GRU to hack into and acquire emails from the Democratic National Committee, the Democratic Congressional Campaign Committee, and individual Democratic campaign officials for release to the public in an effort to influence the 2016 election. Specifically, it details the specific online personas and domains used by the GRU to conduct these operations, as well as the techniques and procedures used in the attack. The section also discusses how the stolen emails were used to influence public opinion, as well as steps taken by the government and private companies to disrupt Russian intelligence operations.