Problem with Trojan.Smoaler on MAC with Version 12

Just installed newly purchased NAV for MAC.  It immediately informed me that a file called Invoice_Copy.exe was infected with Trojan.Smoaler, and had been deleted.  Unfortunately, the problem wasn't resolved.  Now, thanks to the fact that I have no control over the scheduling of scans, NAV "discovers" this issue about every five minutes, resulting in almost continuous notification of file deletions (hundreds per day).  Is anyone else having this problem?