This type of trojan contains one or more malicious programs, which it will secretly install and execute.
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A Trojan-Dropper is a type of trojan that drops different type of standalone malware (trojans, worms, backdoors) to a system. It is usually an executable file that contains a other files compressed inside its body. When a Trojan-Dropper is run, it extracts these compressed files and saves them to a folder (usually a temporary one) on the computer.
In many cases, Trojan-Droppers also drop and executes to display games, images or messages, which serve as decoys to avert attention from malicious activities. For representative examples of Trojan-Droppers, see the following descriptions:
Some Trojan-Droppers extract components directly to memory and activate them there. In this case anti-virus software is not able to detect dropped malware, so detection of the whole trojan dropper package is added.
For more information, see Terminology: Trojan-Dropper.