It is not haram in selling a car to the holder of the winning ticket, but taking possession of, and using the money paid by the other people who took part in lottery is unlawful. Thus it should be returned to them.
Question: A person offered his car for sale by way of lottery. It works like this: Those willing to take part in the draw buy the ticket for a certain amount. After the specified period is up and the target money achieved, the draw takes place. The holder of the winning ticket would own the car. Is this way of selling the car permissible in the Islamic law?
Answer: There is no harm in selling the car to the holder of the winning ticket, in such a way that the deal is struck after the time of the draw. However, taking possession of, and using the money paid by the other people who took part in lottery is unlawful and considered as ill-gotten property. Accordingly, it should be returned to them.[1]
[1]. Ayatollah Seyyed Ali Khamenei, Practical Laws of Islam, Q1231.