Wacatac in JFFS?

[ahab]

I had some trouble with Diversion last night, poor performance, so I uninstalled it and uiDivStats, then reinstalled, along with the youtube ad blocker piece. Today I went to back up my JFFS partition from the ASUS GUI and Microsoft Security Essentials complained that it found Wacatac.C!ml in the files and wouldn't download the .tar file. Is this a false positive? The router is about a week old, I backed up the JFFS folder into a tar file a few days ago, before Diversion and uiDivStats and had no error then. MSE said it found no instances of the virus on any local files. Help or advise appreciated. I searched here and found nothing relevant. TIA

Edit: Sorry, RT-AX86U