The beast is some kind of system most likely religious political, the man of sin is the horn:
Daniel 7:25, "And he will speak great words against YHWH, and will wear out; mentally attack to cause to fall away, the saints of YHWH, and think to change times and Laws…"
Daniel 7:7-8, “After this I looked in the night visions and saw a fourth beast, fearsome and burly, exceedingly strong. And it had great iron teeth. It devoured and crushed, and trampled down the rest with its feet. And it was different from all the beasts that were before it, and it had ten horns. I was thinking about the horns, then saw another horn, a little one, coming up among them, and three of the first horns were plucked out by the roots before it. And see, eyes like the eyes of a man were in this horn, and a mouth speaking great words."
Daniel 7:19-21, “Then I desired for certainty concerning the fourth beast, which was different from all the others, very fearsome, with its teeth of iron and its nails of bronze, which devoured, crushed, and trampled down the rest with its feet, and concerning the ten horns that were on its head, and of the other horn that came up, before which three fell – this horn which had eyes and a mouth which spoke great words, whose appearance was greater than his fellows. I was looking, and this horn was fighting against the set-apart ones, and was prevailing against them,"
Daniel 7:21-24, “I was looking, and this horn was fighting against the set-apart ones, and was prevailing against them, until the Ancient of Days came, and right-ruling was given to the set-apart ones of the Most High, and the time came and the set-apart ones took possession of the reign. This is what he said, ‘The fourth beast is the fourth reign on earth, which is different from all other reigns, and it devours all the earth, tramples it down and crushes it. And the ten horns are ten sovereigns from this reign. They shall rise, and another shall rise after them, and it is different from the first ones, and it humbles three sovereigns,""
2 Thessalonians 2:3-12, “Let no one deceive you in any way, because the falling away is to come first, and the man of lawlessness is to be revealed, the son of destruction, who opposes and exalts himself above all that is called the Most High or that is worshipped, so that he sits as the Most High in the Dwelling Place of the Most High, showing himself that he is the Most High. Do you not remember that I told you this while I was still with you? For the mystery of iniquity is already working, but the One restraining him will continue to restrain him, until he is made to appear in the midst. And then that lawless one will be revealed, whom Yahshua will remove with the breath of His mouth, and make powerless with the appearance of His coming-- Whose coming is according to the energy of Satan, who works with all power, and signs, and lying wonders, And with all deceivableness of sin in those who are perishing, because they did not receive the love of the truth, that they might be saved. And for this reason, YHWH will send them strong delusion, that they would believe the deception, In order that all those may be judged as not having believed the truth, but as having delighted in sin.”
Daniyl 7:25, "And he will speak great words against YHWH, and will wear out; mentally attack to cause to fall away, the saints of YHWH, and think to change times and Laws…"