Did you just run into a download or a file on your computer that is digitally signed by XTRM GROUP LTD? Some of the security products refers to the detected files as PUP.Optional.MySafeProxy.A and Adware.Siggen.31202. The detection rate for the XTRM GROUP LTD files collected here is 6%. Please read on for more details.
You will probably see XTRM GROUP LTD when 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 additional details from the XTRM GROUP LTD certificate with the following steps:
Here's a screenshot of a file that has been signed by XTRM GROUP LTD:

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 XTRM GROUP LTD and that the file has not been tampered with.
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 XTRM GROUP LTD, such as the street name, city and country.
COMODO Code Signing CA 2 has issued the XTRM GROUP LTD certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the XTRM GROUP LTD files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 3/54 | MySafeProxyMonitor.exe |
| 2/54 | MySafeProxy64.dll |
| 4/54 | MySafeProxy32.dll |
| 3/55 | MySafeProxy32.dll |
Here is the detection names for the XTRM GROUP LTD files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| DrWeb | Adware.Siggen.31209, Adware.Siggen.31202 |
| Malwarebytes | PUP.Optional.MySafeProxy.A |
| Symantec | WS.Reputation.1 |
| TrendMicro-HouseCall | Suspicious_GEN.F47V1028, Suspicious_GEN.F47V047 |
The detection percentage is based on the fact that I have gathered 217 scan reports for the XTRM GROUP LTD files. 12 of these scan results came up with some sort of detection. You can review the full details of the scan reports by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: