Well The VT results are effectively 2 detections as GData also uses avast as one of its two scanners, so you should send that file for further analysis.
If it is indeed a false positive (and it seems so), see
http://forum.avast.com/index.php?topic=34950.msg293451#msg293451, how to report it to avast! and what to do to exclude them until the problem is corrected.
The three files you mention don't happen to be in the System Files section, as they are back-ups of your system files and shouldn't be infected, or effectively the originals (that they were coyed from) would be infected
So I believe what you mean was the file you uploaded to VT was infected by that malware but I find it very hard to believe the others are infected, have you scanned them in the chest ?
I really do wish Alwil would get rid of this All Chest Files collation of the three sections.
- The only area you should be interested in is the Infected Files section, this is where the files detected by avast and selected by you to move to the chest are placed.
- The User Files section is where the user can add files they suspect of being malware but not detected by avast.
- The System Files section is where avast keeps back-up copies of important system files in case the original becomes infected (leave them alone).