Dridex detection

I need to check that a computer running Norton Internet Security has not been infected by dridex malware.

it came in via an Excel spreadsheet, which Norton passed as safe, but may have downloaded http://errebi-vicenza.it/7656/4563.exe

I can't tell if it did, and if it did, then where to? and is the system/browser infected?

Full system scans report no threats.

Any help, anyone?