The fictional Asian invaders would most likely be Indonesians.
Australian media tends to be very friendly towards east Asian countries except for two: Malaysia and Indonesia. I will leave it for the readers to figure out how these two countries are different from the rest of east Asia.
Australian media is particularly vile towards Indonesia. Every time an Aussie drug runner gets caught in Indonesia, the entire Australian media goes into a frenzy of rabid racism against Indonesia.
One ex-whore caught red-handed and sentenced to 20 years in Indonesia has been turned into a national heroine and a martyr. Not one single law enforcement official, including the Australian Federal Police, believed her bullshit excuse, but the media routinely portrays her as a victim.
I disagree with malaysia they looked at well imo.goverment also has good ties with them and they are considered more modern or western.