There is no virus by this name. However, some shareware applications installed a Win95/98 process by this name. Tsadbot connects to an advertisment server over the internet and downloads new advertisments to display while using the product.
Tsadbot is included at least with the Windows version of PKZIP.
For more information, see https://www.timesink.com and http://www.pkware.com
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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