Threat Description

Music Bug

Details

Aliases: Music Bug
Category: Malware
Type: Virus
Platform: W32

Summary


This virus contains a couple of text strings:

'MusicBug v1.06 MacroSoft Corp.' and '-- Made in Taiwan --'

Like the Azusa virus, this virus infected the computers of a Taiwanese producer of VGA-driver software, which then distributed infected, shrink wrapped, write-protected diskettes to unsuspecting users.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.



Technical Details


When a computer has been infected for four months, the virus enables the "music" effect. Then it uses the system timer as a random generator to determine whether it should play a tune or not. The chance of that to happening is close to 14 percent. The tune it plays is a sequence of 36 notes, each of which is selected at random from a list of eight basic notes. The authors idea was probably to increase the virus' chances of spreading, by making it stay silent for the first four months after it infects a system.

Music Bug infects the DOS Boot sector and also recognises 360K and 1.2MB 5.25" diskettes. It will not attempt to infect 3.5" diskettes. It assumes the diskettes always have 12-bit FAT entries and hard disks use 16-bit FATs, so it might be quite destructive when this is not the case.






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