I do not know sub scientific classification of these types of wasps, it is red maroon, but I believe he is a Hornet. I feel anxious when taking photos, I think, if disturbed he will attack the with a weapon in the buttocks. I found not in groups, and nest hanging strands of weeds.
Taken with smartphone Xiaomi redmi Pro camera, additional macro lens, at Banda Aceh, Sumatra.