This virus first adds 1-16 bytes to the files it infects, so they end on a paragraph boundary. Then 669 additional bytes, containing the virus itself are written to the end.
On any Saturday the 14th, the first 100 logical sectors of drive C, then B, then A are overwritten with rubbish.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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