This virus activates on Friday the 13th displaying the message:
"Something wonderful has happened, your PC is alive".
When it is on the 4th day of any month it shows the message:
"Water detected in match-co-processor".
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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Jihuu will activate in the year 2000. Then it tries to overwrite the hard disk and displays:
"PARITY ERROR System halted".
This variant was found almost three years after the variant 621 - in May 1994. The operation of the virus is identical, but the text messages have been encrypted with XOR FFh operation.