The deal with Attica Holdings SA, Greece's biggest ferry operator, calls on Daewoo Shipbuilding to deliver the vessels by March, 2012, the company said in a statement.
The order is Daewoo Shipbuilding's biggest since August last year.
Orders for new vessels have dropped since the third quarter as a credit crisis and the global recession prompted shipowners to delay taking delivery of vessels or cancel orders.
Shares of Daewoo Shipbuilding were trading at 20,550 won on the Seoul bourse as of 9:11 a.m., up 2.24 percent.