Callidula sakuni, a moth.
The twin silvery bars on the UnF are bot narrow & co-linear.
https://www.mothsofborneo.com/part-8...ulidae_2_2.php
In the similar C. sumatrensis the lower silery component is broader & more triangular.
TL Seow: Cheers.
Thank you, Dr Seow! No wonder I was off track trying to ID it as a butterfly!