This is a portion of what's being called the "Murdered by the Sky" transmission released by Wikileaks on 20 November 2015.
The International Space Exploration Coordination Group (ISECG) documents accompanying the transmission in the Wikileaks release indicate the transmission was first received in March 2015. ISECG documents refer to the signal as "VLA-2015," after the telescope that first detected it (the Very Large Array in New Mexico). The documents also suggest the transmission could originate from deep space, a re-booting ISECG satellite in Martian orbit, or perhaps Phobos, one of Mars' two moons.
Dr. Kenneth Nielson, an acoustic technician with the Trodza Institute at University of Copenhagen, provided us with this re-mastered recording. Dr. Nielson can neither confirm nor deny the existence of the supposed morse-code message "murdered by the sky" that several other astronomers and scientists have detected in the transmission.