Adri is a Hungarian virus. The virus overwrites the MBR of the first hard drive after one month of the first infection. The virus infects EXE files during execution and appends its excrypted virus body to the end of such files.
It does not display a message when it activates, thus the problem with the hard disk will be visible after booting the PC next time.
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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