From the Super Mario Wiki
Hiders are ghosts appearing in Luigi's Mansion: Dark Moon. Per their name, these ghosts tend to hid in furniture or other objects, and flee to another spot if found. Hiders appear in groups of at least two, and always attack alongside other ghosts. They have 15 HP, but they have high speed.
Hiders throw objects at Mario or Luigi while hiding inside furniture or objects, doing 10 damage. Sometimes, they throw banana peels to make Luigi slip. Luigi has to be quick in capturing them, due to their speed.
Ghost Container Description
These clever fellows love playing hide-and-seek. A bit impatient though, so if you take too long to find them, they'll start throwing things at you! Stay on your toes!
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