This is large family or loosely-related viruses from Italy. They all contain a reference to 'Grog' in internal texts. Sizes of the viruses range from 200 to over 2000 bytes.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Earlier variants infect only COM files. Later ones are resident, infect COM and EXE files and employ encyrption.
There is a wide variety of texts contained within the variants.
Grog viruses are not common outside Italy.
In February 1996 there were over 50 different Grog variants.
Description Created: Mikko Hypponen, F-Secure