This is an unexpected discovery about a malware that targets AutoCAD users. This malware called ACM_UNEXPLODE.C propagates by infecting AutoCAD files that were opened on infected computer. In addition, this malware will also modify and add various entries to the Windows registry. These add a user named SERVICER to the system with administrative rights. All drives with letters from C to I are also shared.

Source: blog.trendmicro.com