A young woman was attacked while trying to open the front door of a Coburg house by a stranger who had followed her along the street.

Police said that on June 23, a 22-year-old woman was followed down Wolseley Street in Coburg by a man believed to be about 20 years old.

The attacker was wearing a blue jacket with white sleeves at the time of the attack. He is about 170 centimetres tall and has a medium build.

After being followed, the woman tried to open the front door of the house when the man sexually assaulted her, police said.