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=USUAN1200024

MacLeod's description:

Genre: Soundtrack
Length: 3:03
Instruments: Percussion, Synth, Guitar
Tempo: 138

Thin, dark, moody piece that accelerates to the end. Remarkably metered and free at the same time. Guitar is all half muted.

ISRC: USUAN1200024
Dark, Suspenseful, Unnerving 2012