Did you just run into a download or a file on your computer that has a digital signature from Vast Tech Support? If that's the case, please read on.
You will probably see Vast Tech Support when double-clicking to run the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for Vast Tech Support with the following steps:
Here's a screencap of a file that has been digitally signed by Vast Tech Support:

As you can see in the screencap above, Windows reports that "This digital signature is OK". This means that the file has been published by Vast Tech Support and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can see all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also examine the address for Vast Tech Support, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the Vast Tech Support certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Vast Tech Support files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/52 | OMGTotalProtection.exe |
| 0/55 | OMGAntivirus.exe |
The detection percentage is based on the fact that I have collected 107 scan reports for the Vast Tech Support files. 0 of these scan results came up with some sort of detection. You can view the full details of the scan reports by examining the files listed above.
The analysis is done on certificates with the following serial numbers: