Interestingly, I have found very extensive research about the Iranian/Zorastrian demonology. It is a Thesis by Chris Ghan under the supervision of Dr Signe Cohen, presented to the Faculty of the Graduate School at the University of Missouri-Columbia.
I have found lots of information about Zoroastrian demonology as well as symbolism and mythology. Interestingly, ancient Persian demonology is one of the infrastructures of western Theism, demonology and mythology, As the word “Deus” is derived from “Deava” which means demon, contrary to the contemporary interpretation of demons, they used to be gods, they did not have any shape or physical depiction, sometimes helping and sometimes harmful, not ugly, disfigured, annoying creatures. However, they had to change their functionality after other religions, such as Islam, took over and the new god became the dominant one, leaving no room for any other.
Zoroastrian demons are responsible for human behaviour, wrath, greed, illness, or even diseases, but sometimes they feel empty with these “weak creatures of God, humans!” and they decide to help them, for instance, to show them where the treasures are hidden!
Whatever they are, they are part of the culture, and even after thousands of years, some people still believe in them. There are countless stories and histories about them.
Ghan, Chris. “The Daevas in Zoroastrian Scripture”. ProQuest Dissertations Publishing, 2014.