Whilst the interface says email to Alwil software (in the image also) this function has been improved so that it is actually uploaded as part of the avast update process. Previously people had problems emailing or they only used web mail so 'couldn't' send by email.
Open the chest, User Files section, File, Add, navigate to the location of the C:\WINDOWS\system32\h@tkeysh@@k.dll file select it and click the open button (doesn't actually open) and that starts the copy to the chest.
Yes the VT results look like a key logger i action so once you have it added to the chest, run MBAM and get rid of the copy and the other registry detections.
I would advise because there has been a key logger on your system that you start changing your user names and passwords, starting with any on-line banking or security/sensitive ones first.