Startup PFP finds malware intrusions by monitoring processor radio frequencies

Startup PFP is based on research from Virginia Tech funded by the Departments of Defense and  Homeland Security. They were seeking a way to identify whether software-defined radios have unauthorized software running on them. The technology that was developed has a much more general application, particularly in SCADA and other embedded systems, which are often difficult to protect using standard anti-malware tools.
The name PFP comes from power fingerprinting, which is how the founders describe what their system establishes for each device it protects.