What is the ruling on a person obtaining a sum of money from an Islamic bank to purchase a car by proxy from the bank, then selling it to himself, and repaying the borrowed amount with a fixed return over five years?

If the bank authorizes a person to purchase a car for themselves or to sell it in installments after it has come into the bank's possession, this is permissible. However, if the bank gives a person money to buy a car and the person repays the bank with an increase in installments, this is a usurious loan forbidden in Islam, and calling it "murabaha" (cost-plus financing) is a deception. It should be noted that the permissibility of the client handling the buying and selling is conditional on it not being used as a trick to engage in usury.