Did you just run into a download or a file on your computer that has been digitally signed by Gretech Corp.? If so, please read on.
You will probably see Gretech Corp. when running 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 Gretech Corp. certificate with the following steps:
Here's a screenshot of a file digitally signed by Gretech Corp.:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This implies that the file has been published by Gretech Corp. and that no one has tampered with the file.
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 view the address for Gretech Corp., such as the street name, city and country.
Thawte Code Signing CA has issued the Gretech Corp. certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Gretech Corp. files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/55 | GOM.exe |
The detection percentage is based on that I've gathered 55 scan results for the Gretech Corp. 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 based on certificates with the following serial numbers: