Did you just find a download or a file on your computer that has a digital signature from Thomas Holz? If so, please read on.
You will typically notice Thomas Holz 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 additional details from the Thomas Holz digital signature with the following steps:
Here's a screenshot of a file that has been signed by Thomas Holz:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This means that the file has been published by Thomas Holz and that no one has tampered with the file.
If you click the View Certificate button shown in the screengrab 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 view the address for Thomas Holz, such as the street name, city and country.
DigiCert SHA2 Assured ID Code Signing CA has issued the Thomas Holz certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Thomas Holz files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 1/58 | WhatsMyComputerDoing.exe |
| 0/68 | WhatsMyComputerDoing_E.exe |
Here's the detection names for the Thomas Holz files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| Zillya | Adware.BrowseFoxCRTD.Win32.9842 |
The detection percentage is based on that I have gathered 126 scan reports for the Thomas Holz files. 1 of these scan reports came up with some sort of detection. You can view the full details of the scan results by examining the files listed above.
The analysis is based on certificates with the following serial numbers: