How to make this intriguing attack and trailing sound

[skvrabw]

Hello,

Thank you for this forum.

I am learning sound design, there is an effect I really like but have a hard time figuring out how it was made : http://sndup.net/j7kh or here https://jmp.sh/s/311wiOpaRQgb5S0zJxZw.

Any idea of how it was made?

Thank you in advance

[CHOOS]

its 3 different sounds
first taps are one percussion.
Then another percussion
then a square sound.

All with lots of riverb