The first apostasy was Satan's, individually. After his personal apostasy, Lucifer (Satan) lead a treasonous coup against Yahweh and His government. Satan's coup, seemingly successful at first, has and will fail. But the strategy is very clear. That strategy started with the (attempted) overthrow of Yahweh's government and substitution of a false government (unsuccessfully in Heaven but with great influence on Earth).

How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations! For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north: I will ascend above the heights of the clouds; I will be like the most High. Isaiah 14:12-14

After establishment of his government, Satan was free to lead his followers in steps 2 through 4 of apostasy, finally resulting in step 5, changing the laws of Yahweh.

And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: Daniel 7:25

Daniel's prophecy is more specifically aimed at the little horn of the fourth beast of Rome, but generally was part of Satan's overall plan. It must be remembered that all Satan's followers are proxies for Satan, himself.

Satan's apostasy was personal, not corporate, so didn't exactly follow all the steps of corporate apostasy. But to bring the fallen angels along, he approximated the pattern.