This is a variant of the Jerusalem virus from Australia. Some reports indicate it may cause a slowdown of the system, but this has not been confirmed. The major difference between this virus and the standard Jerusalem virus is the use of a simple encryption in the Slow virus.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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A 2126 byte variant from California.
This variant is much longer, 4112/4117 bytes, and uses a different encryption method. As it was found in Australia, and resembles the Slow virus, it is classified as a variant, although it has not been analyzed yet.