Did you just run into a download or a file on your computer that is digitally signed by EFI Software? If so, please read on.
You'll probably see EFI Software 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 additional details from the EFI Software certificate with the following steps:
Here is a screenshot of a file that has been signed by EFI Software:

As you can see in the screengrab above, Windows states that "This digital signature is OK". This means that the file has been published by EFI Software and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot above, you can examine 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 view the address for EFI Software, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the EFI Software certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the EFI Software files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/56 | ofaapp.exe |
The detection percentage is based on that I've gathered 56 scan reports for the EFI Software 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 is done on certificates with the following serial numbers: