Music by Kevin MacLeod. Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100781

MacLeod's description:

Genre: Unclassifiable
Length: 3:28
Instruments: Percussion, Synths, Misc
Tempo: 103

Subtle atmospheric sounds and rain-like cymbal elements blend together, creating an aura of intensity and intrigue, suitable for a mysterious or suspenseful production. The sounds build in force just before the end.
ISRC: US-UAN-11-00781
Intense, Mysterious, Suspenseful 2011