Mades welcome to Avast! Forums.

Those are memory detection of encripted virus files for Comodo and MBAM. Are you running a custom scan and selected Memory ? Memory scans gives wierd results and it is better to avoid doing it.

Those memory detection can not be quarentine. When you get a real detection, Avast! analysis result will give you the opportunity to choose what to do with the file.

If you open Avast! Virus Chest and right click on it, you have the choice to add a file to the virus chest that way you can send the file to Avast! lab or see its properties. Still this is only a copy, the original file remains in its place