Did you just run into a file that is digitally signed by Brand Thunder LLC? If so, please read on.
You will typically see Brand Thunder LLC when 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 additional details from the Brand Thunder LLC digital signature with the following steps:
Here's a screenshot of a file that has been signed by Brand Thunder LLC:

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This implies that the file has been published by Brand Thunder LLC 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, and so on. You can also examine the address for Brand Thunder LLC, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the Brand Thunder LLC certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screencap above.
These are the Brand Thunder LLC files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/47 | bt-thememanager.dll |
| 0/53 | tbcore3.dll |
The detection percentage is based on that I've collected 321 scan reports for the Brand Thunder LLC files. 0 of these scan results came up with some sort of detection. You can review the full details of the scan results by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: