Default Strange Data Usage Issue - Unknown 5-Digit Applications

I'm using a rooted stock AT&T Samsung Note SGH-717. I looked at my data usage today for a completely unrelated reason, and discovered that something called "10290" had burned through 1.24G on wifi. Then I found a couple other 5-digit bandits that hadn't made nearly as big a dent.
It does appear to have stopped its deluge about a week ago. "Coincedentally", I used Link2SD to move some apps around at about that time.

My greatest concern is to find out if this *is* a concern, if these apps could be malware.

I've done several searches and am shocked that I can't find any other answer, so here I am. I can't begin to guess where to start looking for this solution.

Thanks for any help available!