Virus protection method, system and device for network attached storage system, and medium

The invention provides a virus protection method, system and device for a network attached storage system and a medium. The method comprises the steps that the network attached storage system transmits a received service file to a virtual machine virus scanning program; the virtual machine is controlled by a host machine where the network additional storage system is located; the number of the virtual machines is not less than one; the virtual machine virus scanning program carries out virus scanning on the business file; and returning the service file to the network additional storage system from the virtual machine under the condition that the service file is judged to be safe. The invention further provides a virus protection method based on the network attached storage system, a virus protection system of the network attached storage system, equipment and a medium. The anti-virus program runs on the independent virtual machine, so that the problem that the performance of the storage system is reduced due