If you cannot watch videos and movies or listen to the radio online because of annoying audio advertisements, it is likely you are dealing with “Random audio ads”, which are played by Rootkit.Boot.Harbinger.a. Random audio ads can be heard without using any browser. It means that it is not a browser extension that you have to remove from the PC but a more serious infection. More specifically, Random audio ads are played by a malicious bookit infection, which infects the Master Boot Record (MBR), which is a boot sector that is responsible for the partitions and the startup of the operating system.
When Master Boot Record is infected, the threat can start running before the system starts. The infection loads a fake MBR during the startup up the system, which allows the threat to bypass system security tools and secretly run in the background of the system. Rootkit.Boot.Harbinger.a starts to play Random audio ads when the original MBR is restored, which means the covert infection is capable of controlling the Master Boot Record so that you cannot identify the issue.
It has been found that the infection which disturbs you with Random audio ads has the characteristics of a rootkit infection. It runs as non-plug and play drivers and hides its files in the unallocated disk space, which does not belong to any partition. It means that its files cannot be detected like a standard file. Hence, in order to rid the computer of Random audio ads, you should take appropriate measures. The instructions below you should help you remove the malicious bootkit. If you have any questions regarding the removal of the bootkit infection, leave your comment in the comment box below.