This is a family of stealth multipartite fast infecting viruses originating from Australia. There are at least five variants, sizes ranging from 2 to 3 kB.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
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.
One of the variants generates an endless loop to the partition table, making PC crash when it tries to boot from a clean floppy which has MS-DOS v4.0 - 7.0. To overcome this, use PC-DOS 7.0, MS-DOS 3.3x or a non-DOS boot floppy. Contact F-Secure anti-virus support for further instructions.
Note: Rainbow is also an alias for the WordMacro/Colors virus.
Description Details: Mikko Hypponen, F-Secure