Duqu is delivered via an infected Microsoft Word file attached to a highly customized and targeted phishing email. Iranian officials say they ve distributed software to rid computers of the Duqu menace. It s likely the entire impact of Duqu infections remains unknown and, will only fully reveal itself later in 2012. Duqu was designed to damage SCADA-driven industrial machines, where Stuxnet is more intent on monitoring user activity and stealing data. And Duqu seems to be delivering an infected Word file.
Source: https://threatpost.com/not-again-duqu-hits-iran/91894/