Gullich is a typical boot sector virus, except that it infects the DOS boot sectors, not MBRs.
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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It infects a computer's hard disk only if the computer is booted with an infected diskette in drive A:, in which case the virus infects the hard disk's DOS boot sector. The virus goes resident in memory the next time the computer is booted from the hard disk. Once in memory, Gullich infects all non-writeprotected diskettes used in the computer.