Albert Barnes Commentary Zechariah 5:9

"Then lifted I up mine eyes, and saw, and, behold, there came forth two women, and the wind was in their wings; now they had wings like the wings of a stork; and they lifted up the ephah between earth and heaven." — Zechariah 5:9 (ASV)

There came out two women—It may be that there is no symbol in this, but that he names women because it was a woman who was carried in this way. Yet their wings were the wings of an unclean bird—strong, powerful, borne by a force not their own. With their will they flew, yet also beyond their will, for the wind was in their wings. Rapidly, inexorably, irresistibly, they flew and bore the Ephah between heaven and earth. No earthly power could reach or rescue it. God would not.

It may be that evil spirits are symbolized, resembling this personified human wickedness—spirits who snatch away the souls of the damned, who, by serving them, have become like them.