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=USUAN1100048

MacLeod's description:

Genre: Horror
Length: 3:17
Instruments: Synth

Background horror music. Electronic. Slow, rumbly, and whiny Moderately unnerving. 037
ISRC: US-UAN-11-00048
Dark, Eerie, Mysterious 2005