This virus activates on Monday the 23rd of any month not in 1990, formatting the beginning of the hard disk. It may also delete files, as they are opened. The increase in length of infected files is not visible when a DIR command is given.
This virus belongs to the Jerusalem family.
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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