Actually, this is one I’m a bit undecided on. Both this entire passage from Isaiah and the passage from Ezekiel 28:11-19. Certainly both could apply to Satan but both come within a prophetic oracle aimed at Babylon and Tyre respectively and may be referring to nothing more than these antagonists. These prophetic oracles against Israel’s enemies are a very common feature in almost all the books of the prophets and are generally highly symbolic but never wander off into angelic, heavenly narrative. I want to land in the “referring to Satan” camp but I have reservations. In any event I lean that way but cautiously.
You might want to complement it with these verses from Revelation 12:3-4. They describe the heavenly war.
And another sign appeared in heaven: behold, a great, fiery red dragon having seven heads and ten horns, and seven diadems on his heads. His tail drew a third of the stars of heaven and threw them to the earth.