Did you just run into a file that is digitally signed by Fast Rabbit Software, LLC? If so, please read on.
You'll typically see Fast Rabbit Software, LLC when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for Fast Rabbit Software, LLC with the following steps:
Here is a screenshot of a file that has been digitally signed by Fast Rabbit Software, LLC:

As you can see in the screengrab above, the Windows OS reports that "This digital signature is OK". This means that the file has been published by Fast Rabbit Software, LLC and that no one has tampered with the file.
If you click the View Certificate button shown in the screencap above, you can view 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 view the address for Fast Rabbit Software, LLC, such as the street name, city and country.
COMODO Code Signing CA 2 has issued the Fast Rabbit Software, LLC certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Fast Rabbit Software, LLC files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/66 | typing_setup.exe |
| 0/72 | mathflash_setup.exe |
The detection percentage is based on that I have collected 138 scan reports for the Fast Rabbit Software, LLC files. 0 of these scan results came up with some sort of detection. If you like, you can review the full details of the scan reports by examining the files listed above.
The analysis is based on certificates with the following serial numbers: