These are all still working (called and they all answer and claim to be tech support) as of the time of posting.
Website Link: hxxps://d2u2a4vtw6ut4w.cloudfront.net/
Number: 1-844-395-1581
Website Link: hxxps://www.ecurve.cf/microsoft/call-microsoft-security-1-844-888-5420/
Number: 1-844-888-5420
Website Link: http://microsoft0x8024f026us.tk
Number: 1-866-593-2050
Special Notes: This popup attempts to download many potentially malicious files (Chrome tries and can block this if you click "block" fast enough) in an attempt to freeze up the computer. Please use this popup in a safe environment (such as a VM) with caution.