It was only a matter of time:
“ACAD/Medre.A represents a serious case of suspected industrial espionage,” said Zwienenberg. “Every new design is sent automatically to the operator of this malware. Needless to say this can cost the legitimate owner of the intellectual property a lot of money as the cybercriminals have access to the designs even before they go into production.”
Now this is clearly a focus on mechanical designs, but there is a ton of proprietary information out there in DWG and GIS formats. Before you install that 3rd Party GIS extension for ArcGIS for Desktop, think about what you might be giving away.