The F4xx Black Pills are available via the same sources as the F103-based Blue Pill ones, for a similar price, but feature an MCU that’s considerably newer and more powerful.

Is Joanna Rutkowska's legendary Blue Pill unbeatable? A number of security researchers presented their cases for the possibility of trumping virtual-machine rootkits, and even Rutkowska herself ...

In the second part of her presentation at Black Hat, Rutkowska, a noted expert on rootkits, detailed Blue Pill, which can hijack a computer and serve as a backdoor for attackers.