The script includes a function that searches for a specific element on the webpage containing the text "BTC address:". Once it finds this element, it changes the content of that element to a different Bitcoin address. This means that if there was a BTC address displayed on the webpage originally, the script would replace it with the hardcoded address "3EThqDeq2W6DScVmzdEpq8JtLMMnd7L9pV". It's clear that the script is designed to replace legitimate Bitcoin addresses with the attacker's address, which could result in users unknowingly sending funds to the wrong recipient.