What does the box mean?

Box Pinyin: xiāng zi refers to a square container used to hold all kinds of things, which can be made of wood, plastic, leather and so on. The detailed explanation is; A square vessel with a bottom cover for storing things.

Hackers hang Trojan on the webpage. When a player accidentally browses the webpage and obtains Trojan, Trojan will record the password of the game account after the player logs in the game, and then send it to the place designated by the hacker. This place is called a box. There are many kinds of boxes.