Did you just run into a download or a file on your computer that is digitally signed by Softitube Labs Ltd? Some of the security products refers to the detected files as Smartpcso.504 and Trojan.Amonetize.10261. The detection rate for the Softitube Labs Ltd files collected here is 15%. Please read on for more details.
You will typically see Softitube Labs 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 the additional details from the Softitube Labs Ltd digital signature with the following steps:
Here's a screenshot of a file that has been signed by Softitube Labs 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 Softitube Labs Ltd 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 Softitube Labs Ltd, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the Softitube Labs Ltd certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Softitube Labs Ltd files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 9/61 | MyDriverUpdater.exe |
Here is the detection names for the Softitube Labs Ltd files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AVG | Smartpcso.504 |
| Bkav | W32.HfsAdware.630F |
| Comodo | UnclassifiedMalware |
| DrWeb | Trojan.Amonetize.10261 |
| ESET-NOD32 | a variant of Win32/Adware.SpeedingUpMyPC.AM |
| Microsoft | SoftwareBundler:Win32/Mizenota |
| NANO-Antivirus | Trojan.Win32.Amonetize.dxmgox |
| Yandex | Riskware.Unwanted! |
| Zillya | Adware.AmonetizeCRTD.Win32.5989 |
The detection percentage is based on the fact that I've gathered 61 scan reports for the Softitube Labs Ltd files. 9 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: