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It is Felderimyia cf. gombakensis D. Hancock & Drew 1995 (Malaysian J. Sci. 16A: 45-59). The only difference from the type is mostly yellow katepisternum in this specimen on the pic, which does not allow ti ID it definitivly. This, however, can be merely a variability.
Bernhard Merz possibly possesses additional specimens collected in Thailand, but did not listed this species (Papp, Merz & Foeldvari 2006), which is therefore a new record.
And, it certainly is a tephritid.
Val