The track of MH370 had nothing to do with an unidentified aircraft flying around the Straits of Malacca which climbed west towards the Andaman Islands. The Malaysian Government totally threw searchers off the trail.
This image describes the approximate path to the Indian ocean as determined by Doppler analysis of signals received at INMARSAT.
Whilst authorities claim satellite signal analysis tipped them off it should be noted MH370 was probably observed in real time by Australian OTHR radar:
