Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
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From Viruslist.com
This TrojanDownloader expolits a vulnerability in MS Windows accessible during viewing BMP files.
To date Agent only affects Russian versions of MS Windows 2000.
Agent may cause email clients to close on other versions of Windows or in other operating systems.