Rubella Macro Builder’ is designed to trick recipients into letting embedded macros execute. The toolkit is available on Cybercrime Underground for $40 per month. It’s designed to generate malicious Office documents with embedded malicious macros designed to install banking Trojans onto a victim’s PC. Rubella-generated malware acts as a first-stage loader for subsequent subsequent malware downloads and installations on targeted machines. Some Rubella documents with malicious macros have been spotted for sale on at least one “top-tier Russian hacking forum””]
Source: https://www.cuinfosecurity.com/toolkit-generates-malicious-office-macro-malware-a-10899