How do I report to you samples,
I am a Chinese users, my English is not very good, we can use English communication
Send the sample to
virus (at) avast (dot) com zipped and password protected with the password in email body, a link to this topic might help and undetected malware in the subject.
Or send the sample/s to avast as a Undetected Malware:
Open the avast chest and right click in the Chest and select Add, navigate to where you have the sample and add it to the chest (see image). Once in the chest, right click on the file and select 'Submit to virus lab...' complete the form and submit, the file will be uploaded during the next update.