Code Hunter
Introduction
Even if it has anti-virus software, your computer can be attacked by a new virus if the attack occurs before your next antivirus update. However, a virus detection method has been developed that can identify and remove malware of which it has no prior knowledge. A built-in defence in this software helps it act as a third protection layer on top of known-viruses and heuristic scanning. This is done using an algorithm to differentiate between harmless programs and a malware. The new approach identifies a virus based on difference in the rate at which a normal and a malicious software code uses various operating system functions.
Source
Down to Earth, September 2013