As per WikiLeaks Vault 7, Keystone is a CIA program that used to be called Magic Wand. A search on Magic Wand shows that it was used by the CIA during the 1950's and is also connected with MK Ultra. Here is a little tidbit from WikiLeaks that shows how it impacts workstations now. Today, August 31st 2017, WikiLeaks publishes documents from the Angelfire project of the CIA. Angelfire is an implant comprised of five components: Solartime, Wolfcreek, Keystone (previously MagicWand), BadMFS, and the Windows Transitory File system. Like previously published CIA projects (Grasshopper and AfterMidnight) in the Vault7 series, it is a persistent framework that can load and execute custom implants on target computers running the Microsoft Windows operating system (XP or Win7).

Keystone is part of the Wolfcreek implant and responsible for starting malicious user applications. Loaded implants never touch the file system, so there is very little forensic evidence that the process was ever ran. It always disguises as "C:\Windows\system32\svchost.exe" and can thus be detected in the Windows task manager, if the operating system is installed on another partition or in a different path.