Zipper contains several bugs which might corrupt the infected files.
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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This is a simple virus which stays resident in memory and infects COM and EXE files when they are accessed. \COMMAND.COM and \DOS\FORMAT.COM are infected on the first execution.
If you run PKZIPFIX against an infected COM or EXE file, it will create a PKFIXED.ZIP, which contains an assembly source file called ZIPPER.ASM.
The virus contains this text, which is never displayed:
Description Created: 2006-01-01 10:53:46.0
Description Last Modified: 2006-01-01 00:00:00.0