How does avast! quarantine chest files?

[benjabean1]

Hey guys, I was just thinking about the virus chest, and wondering... "How does avast! keep chest files from infecting the host?" I was thinking maybe encryption, or maybe it just uses archives. But a clever virus can extract itself from an archive, probably.  In any case, how does avast! stop a virus from exiting the chest? How does it keep it in there? I hope these aren't trade secrets... 

[Shiw Liang]

Well avast prevent you from being infected from the net by ending connection from a site when a malware is found and prevent the malware from entering your pc

When an infected file is found in your system avast automatically send the infected file to the virus chest.

It just stores the virus there I think >_>

I have no idea..about how the virus is kept

[bob3160]

I have no idea..about how the virus is kept

Then why did you reply  

[DavidR]

The avast chest is a protected area (self-defence module in part), all files that are placed in there are encrypted. The only thing that can access and do anything within the chest is avast.

Yes you can see the chest using explorer and can open it, but you won't see the original file name as avast also changes that, see image. So even if some piece of malware was in the chest, nothing knows the file name of the original malware, so even if it weren't encrypted as well you couldn't really run it.

A clever virus or not, must first have a registry entry to run it or another piece of malware to run it (they can't run of their own volition), so it couldn't effectively extract it from the chest and decrypt it to enable it to be run, so files in the chest are not able to infect the host.