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.
Dropper-GF is a Search hijacker that installs itself as a Browser Helper Object for Internet Explorer and redirect specific searches.
This trojan usually get installed into user computer by other trojans.
Once installed, this trojan updates itself and downloads configuration from a remote server. This configuration information is then used to redirect searches.