Troj/GrayBrd-AR is a Trojan for the Windows platform.
When first run Troj/GrayBrd-AR copies itself to <Windows folder>\host.exe.
The file host.exe is registered as a new system driver service named "host", with a display name of "host" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\host