Volume boot record definition
A volume boot record (VBR) is an important part of a storage device (e.g., a hard drive). It stores the code for kickstarting the operating system. VBRs can be found in various computer storage devices, such as hard disks, SSDs, and even USB flash drives — and are used every time the computer starts up.
See also: BadUSB
How does the volume boot record work?
- 1.A VBR works behind the scenes to kickstart your operating system, with the whole process typically only taking several seconds.
- 2.When you turn on your computer, it checks for a device to start from, like a hard drive or SSD.
- 3.It finds the volume boot record (VBR) on the chosen device.
- 4.The computer runs the code in the VBR to kick off the process of loading the operating system.
- 5.The VBR helps the bootloader find all the files it needs.
- 6.The bootloader then loads the operating system, and your computer is good to go!
VBR and cybersecurity concerns
A VBR can become a target in cyberattacks. Here’s how:
- Attackers may create specific malware that infects the VBR and loads malicious code during the boot process.
- Cyberattacks may corrupt the VBR, preventing the system from booting properly.
- Hackers may modify the VBR to gain control over the boot process — and may even install rootkits or other malware.
- If the attackers manage to compromise the VBR, they may use it to bypass security mechanisms and load malicious operating systems or tools.
- Attackers may manipulate the VBR to redirect the boot process to steal information or launch further attacks on the system.
