Did you just find a download or a file on your computer that has a digital signature from Castel Communication Ltd.? Some of the security products refers to the detected files as Adware.Shopper.341 and Adware.Singalng. The detection rate for the Castel Communication Ltd. files collected here is 9%. Please read on for more details.
You will probably notice Castel Communication Ltd. 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 Castel Communication Ltd. certificate with the following procedure:
Here is a screenshot of a file that has been digitally signed by Castel Communication Ltd.:

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 Castel Communication Ltd. and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can view 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 see the address for Castel Communication Ltd., such as the street name, city and country.
COMODO Code Signing CA 2 has issued the Castel Communication Ltd. certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Castel Communication Ltd. files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 10/47 | lyricstar.dll |
| 1/46 | lrcstube.dll |
| 5/47 | VideoSaver.dll |
| 1/47 | VideoSaver.dll |
Here is the detection names for the Castel Communication Ltd. files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AVG | Generic5.AALS |
| Avast | Win32:AddLyrics-F [Adw] |
| Comodo | ApplicUnwnt |
| DrWeb | Adware.Shopper.341 |
| ESET-NOD32 | Win32/Adware.AddLyrics.F |
| GData | Win32.Trojan.Agent.D91LP3 |
| Microsoft | Adware:Win32/AddLyrics |
| PCTools | Adware.Singalng |
| Sophos | Generic PUA EA |
| Symantec | Adware.Singalng |
| TrendMicro-HouseCall | TROJ_GEN.F47V0424 |
| VIPRE | Adware.Singalng |
The detection percentage is based on the fact that I've gathered 187 scan results for the Castel Communication Ltd. files. 17 of these scan results came up with some sort of detection. If you like, 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: