Chlenias (genus)? Caterpillar similar to Chlenias zonaea, see here:- https://lepidoptera.butterflyhouse.com.au/dipt/zonaea.html However adult C. zonaea are yet to be recorded on NatureMapr for the ACT. See also here:- https://projectnoah.org/spotting/419233 Moths in the ACT mentions 3 Chlenias spp.: C. banksiaria group, C. nodosus and C. ochrocrana. The larva here does not match C. banksiaria or C, nodusus and I cannot find any images for C. ochracrana online or on file for Moths in Victoria (Part 5). Possibly C. zonaea. I expect, but I cannot rule out C. ochrocrana.