When this virus activates it will attempt to format the beginning of each drive on the system, destroying the FAT and the root directory.
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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See the manual for your F-Secure product on the Help Center.
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This variant is slightly larger, and it contains one additional feature, which is limited "stealth" ability, as no increase in size is visible when a DIR command is given if the virus is active.
This 2877 byte variant adds encryption and the ability to infect .EXE files.