The 'Joke.Win.Stript' is a simple joke program.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
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More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
Being run it imitates Windows having fatal errors by opening series of messageboxes with error messages. After that another messagebox appears with the text:
Are you sure you want to format the hard drive ?
There's only 'OK' button in this messagebox, so the user has to press it anyway. Then the joke opens another dialog with hard disk format progress indicator and the text:
Formatting hard disk. Push Escape to cancel.
If you press 'Cancel' button there appears a messagebox with the text: "Necessary files not found!". After that or when progress indicator reaches 100%, the screen is filled with garbage and the joke waits for keypress. Then the final messagebox appears with the following text:
I scared you, didn't I ?
English and German versions of this joke exists.
Technical Details: Alexey Podrezov, F-Secure