System and method for performing antivirus scan of a virtual machine

Abstract

A system for performing an antivirus scan of backup snapshots of a virtual machine is provided. The system includes a memory storing one or more processor-executable routines and a processor communicatively coupled to the memory. The processor is configured to execute the one or more processor-executable routines to access a plurality of backup snapshots of the virtual machine and perform a complete antivirus scan of one or more snapshots to identify a reference snapshot. The reference snapshot includes one or more malicious files. The processor is further configured to compare file system metadata of a first snapshot with respective file system metadata of the reference snapshot to identify files that have changed between the first and reference snapshots and perform the antivirus scan of the identified changed files to detect one or more malicious files and to generate an updated list of the malicious files. The processor is further configured to access a second snapshot and the updated list of malicious files with corresponding metadata of the files and perform first, second and third screenings of the second snapshot to detect an infected snapshot. The processor is further configured to compare disk offsets and checksum of corresponding data at the disk offsets, metadata and file checksum respectively of the malicious files with corresponding files of the second snapshot to perform the first, second and third screenings in a sequential manner. The processor is further configured to repeat the first, second and third screenings for the plurality of backup snapshots of the virtual machine.