Understanding multipartite virus

Before going forward we should understand about Resident Virus,Non-Resident Virus,Boot Sector and Executable file.I have already blogged about Resident Virus and Non Resident Virus.

Executable Files:

An executable file (exe file) is a computer file that contains an encoded sequence of instructions that the system can execute directly when the user clicks the file icon.Unlike a data file, an executable file cannot be read because it’s compiled.Executable files commonly have an EXE file extension, but there are other executable file formats.

Boot Sector:

A boot sector is a physical sector, or section, on a hard drive that includes information about how to start the boot process in order to load an operating system.

A boot sector exists on an internal hard drive where an operating system like Windows is installed, as well on storage devices that you may not even need to boot from, but instead are just holding personal data on, like an external hard drive, floppy disk, or another USB device.

What Is a Multipartite Virus?

This virus is combination of Resident virus (It store in computer memory) and Non-Resident virus (does not store in computer memory)

A multipartite virus is a computer virus that’s able to attack both the boot sector and executable files of an infected computer.  Multipartite viruses are unique because of their ability to attack both the boot sector and executable files simultaneously. They have capacity to spread in multiple ways.

This virus will typically spread through traditional methods, suck as attaching itself to executable files, but it will also spread during boot up. This characteristic of this virus is called Boot infector,Boot Virus,MBR virus or DBR virus