Antimalware to block malware spreading through USB drives. There is an increasing amount of malware which, like the dangerous Conficker worm, spreads via removable devices and drives such as memory sticks, MP3 players, digital cameras, etc. To do this, these malicious codes modify the AutoRun file on these devices. Panda USB Vaccine is a free solution designed to protect against this threat. It offers a double layer of preventive protection, allowing users to disable the AutoRun feature on computers as well as on USB drives and other devices.