Hassan Saleh said the affected members worked at the Muslim Brotherhood's guidance bureau and its associated non-governmental organization, Ahram Online reported Friday.
The assets were frozen by a judicial ruling that also banned the members' activities, the Justice Ministry said Thursday.
The names of the members and the exact value of their assets were not announced.
Saleh said the court rejected his request for a statement of the money that was frozen.
Egypt's interim government Wednesday declared the Muslim Brotherhood a terrorist organization.
The country's central bank this week froze the assets of more than 1,000 NGOs believed linked to the Muslim Brotherhood.