Vehicles face growing security threats as they become increasingly connected with the external world. Hackers, researchers and car hobbyists have compromised security keys used by the Electronic Control Units (ECUs) on vehicles, modified ECU software and hacked wireless transmissions from vehicle key fobs and tire monitoring sensors, using low-cost commercially available tools. However, the most damaging security threats to vehicles are only emerging. One such threat is malware, which can infect vehicles in a variety of ways and cause severe consequences.