Avast didn’t detected it, because this wasn’t in first place defined as virus. It is Potentially Unwanted Program or Adware, and majority of antivirus products doesn’t detect this software. That is why we have tools like Malwarebytes and Adware cleaner that are specialized for removing these nasties.
We’re done, only to remove used tools 
Please download DelFix by “Xplode” to your Desktop.
Run the tool and check the following boxes below;
[] Remove disinfection tools
[] Create registry backup
[*] Purge System Restore
Now click on “Run” button. Wait for the programme completes his work.
All the tools we used should be gone.
Tool will create and open an log report (DelFix.txt)
Note: The report will also be stored on C:\DelFix.txt
I don’t need DelFix log report.