The 'Small' trojan downloader family consists of more than 370 different variants (info by June 28th, 2004). The main characteristic of these downloaders is that they are very compact (a few kilobytes long) and that they hiddenly download and run executable files on a user's computer.
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.
Many of these downloaders are compressed with different file compressors to reduce their size and to hide their contents from users' eyes. Some of the downloaders from the 'Small' family download adware/spyware, searchware (third-party search plugins), some of them download real trojans and backdoors. But they all do that without any notification to a user and without his approval.
Quite often these downloaders are dropped and activated on users' computers from webpages that are visited with Internet Explorer.
For the generic description of a trojan downloader and for disinfection instructions for this type of malware please refer to this webpage:
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