Most of the recent spam runs containing Word or Excel macro based malware will download Dridex malware onto your system if the attached Word/Excel managed to execute the Macro inside it.
For a while now, Office is set to block macros by default, however, the attachment may try to trick you into
Dridex if run,will keep an eye on online banking activity and if is see any, will grab as much information as possible from your system, for example by taking screengrabs, grabbing the bank forms you are filling in etc.
enabling macros manually - so don't try to
Microsoft has a guide to Macro Security, which is well worth reading here