The body was recovered from Joinabari area on Friday night, said Superintendent Abul Bashar of Savar Model Police Station.
Bulbuli, a Sirajganj resident, was found strangled by a rope. An initial investigation found evidence that she was raped before her murder, said Superintendent Bashar.
Her family has been informed of her death, the police official said. A case will be filed over the incident and those involved are being sought, he added.
The body has taken to Dhaka Medical College Hospital morgue for a postmortem examination.