Did you just run into a download or a file on your computer that is digitally signed by AMGRUP LLC? Some of the security products refers to the detected files as PUP/Win32.Amonetiz and GrayWare[AdWare:not-a-virus]/Win32.Amonetize. The detection rate for the AMGRUP LLC files collected here is 9%. Please read on for more details.
You will probably notice AMGRUP LLC when double-clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the AMGRUP LLC digital signature with the following procedure:
Here is a screenshot of a file signed by AMGRUP LLC:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This means that the file has been published by AMGRUP 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, etc. You can also view the address for AMGRUP LLC, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the AMGRUP LLC certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the AMGRUP LLC files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 5/55 | FlashPlayer__6741_i1420381978_il207.exe |
Here's the detection names for the AMGRUP LLC files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AhnLab-V3 | PUP/Win32.Amonetiz |
| Antiy-AVL | GrayWare[AdWare:not-a-virus]/Win32.Amonetize |
| Avira | ADWARE/Adware.Gen4 |
| ESET-NOD32 | a variant of Win32/Amonetize.CH |
| NANO-Antivirus | Riskware.Win32.Amonetize.djsswg |
The detection percentage is based on that I've gathered 55 scan reports for the AMGRUP LLC files. 5 of these scan results 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: