In BOLD, there seem to be more unnamed than named Australian species of Rhuma. Perhaps its one of those: EF05 looks possible
https://bench.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=535431

Rhuma (genus)

WendyEM wrote:

Yesterday

both C. wilsoni and C. alpina are very similar and can be separated by the patches on the undersides (Moths of Vic Part 4 CD pages)

Cyneoterpna wilsoni

WendyEM wrote:

Yesterday

from the species in Moths of Victoria Part4 the closest I can get is H. diffundens

Hypobapta diffundens

WendyEM wrote:

Yesterday

The male underside here http://lepidoptera.butterflyhouse.com.au/geom/thiobapta.html does not fit above. It may be female or another moth ? I think I can just see antennae in 2nd shot - MAY be female (do not appear to be pectinate like males are).

Rhuma (genus)

Species Richness Score (SRS)

1,349

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Geometer moths (Geometridae)