That's right, it's "The Buzzer", or "UVB-76" or "MDZhB".
A quick check on Utility DX Forum confirmed that the sound belongs to The Buzzer and, most important, I am not the only one who received it!
As the tensions in the Middle East escalates, maybe it is useful to monitor the frequency as it is associated with a military network in the former USSR, now CIS/Russia.
I recommend to use a very sharp 2 kHz filter because the frequency is just near the 40m Amateur radio band so it is probable to hear some CW from above.
This is the "Original" UVB-76":
The "New" UVB-76: