Did you just run into a download or a file on your computer that is digitally signed by NETNS GMBH? Some of the security products refers to the detected files as Application.Agent.MW and NETNS GMBH (fs). The detection rate for the NETNS GMBH files collected here is 6%. Please read on for more details.
You will typically see NETNS GMBH when running the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can also view the NETNS GMBH certificate with the following steps:
Here's a screenshot of a file that has been digitally signed by NETNS GMBH:

As you can see in the screencap above, Windows states that "This digital signature is OK". This implies that the file has been published by NETNS GMBH 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, etc. You can also examine the address for NETNS GMBH, such as the street name, city and country.
thawte SHA256 Code Signing CA has issued the NETNS GMBH 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 NETNS GMBH files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 13/54 | DnsBlockUpdateSvc.exe |
| 7/55 | DnsBlockUpdateSvc.exe |
| 0/55 | dnsblockupdatesvc.exe |
| 0/56 | DnsBlockA.dll |
| 0/55 | DnsBlockA.dll |
Here is the detection names for the NETNS GMBH files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AVware | NETNS GMBH (fs) |
| Antiy-AVL | Trojan/Win32.TSGeneric |
| Arcabit | Application.Agent.MW |
| BitDefender | Application.Agent.MW |
| Comodo | ApplicUnwnt.Win32.Downloader.Agent.G |
| DrWeb | Adware.Softomate.657 |
| F-Secure | Application.Agent.MW |
| Fortinet | W32/BHO.OGV!tr |
| GData | Win32.Adware.Agent.AT, Application.Agent.MW |
| McAfee | Artemis!00E0F83AB0E6 |
| McAfee-GW-Edition | Artemis |
| MicroWorld-eScan | Application.Agent.MW |
| Panda | DnsBlock |
| Qihoo-360 | Win32/Trojan.97a |
| Symantec | Trojan.Gen.2 |
| VBA32 | suspected of Trojan.Downloader.gen.s |
| VIPRE | NETNS GMBH (fs) |
The detection percentage is based on that I have gathered 331 scan results for the NETNS GMBH files. 20 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 done on certificates with the following serial numbers: