This is March 9, 2016 and I am still getting the multiple runs of MRT.exe daily.
Yes, 3 updates (Jan, Feb, and March) and the issue persist, though the Team 'still working' on it (as per PaulSey's comment above).
Please keep monitoring this thread.
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@Brian:
Are you also seeing same scheduled task (MRT_HB) as Susan? Have you tried stopping/removing it?
Are you still seeing 'unconfirmed' detections on your Google Chrome's?