Law enforcement officials believe that the Coreflood botnet has been operating for nearly a decade, the DOJ said.
The Connecticut criminal complaint said a Michigan real estate company lost more than $115,000 to fraudulent wire transfers because of the Coreflood virus. A South Carolina law firm lost more than $78,000, and a North Carolina investment company lost more than $151,000, the complaint said. A defense contractor in Tennessee lost more than $241,000 due to the botnet, the complaint said.
"The full extent of the financial loss caused by the Coreflood Botnet is not known, due in part to the large number of infected computers and the quantity of stolen data," the complaint said.
The DOJ urged computer users to update their security software and scan their computers for viruses.