Music Bug
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
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
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Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
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Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
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Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
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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