I don't think this is Leistarcha sp. - they have pointier wings with insignificant fringe. They also don't seem to have the small kidney shaped spot along the main fawn stripe.
Could this be it, are the palps long enough https://bold-au.hobern.net/specimens.php?taxid=364891 https://inaturalist.ala.org.au/taxa/1548867-Lichenaula-ignota