Edit: I tried to send the .exe file from Gmail to virus@avast.com, but does not let me send files. exe, as I can send the file with virus? Thanks

you can send from avast chest

Moving files to the Virus Chest
http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=501#idt_03

Submitting files from the Virus Chest to avast! Virus Lab
http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=501#idt_07

Or do it online
http://www.avast.com/en-no/contact-form.php?loadStyles

or send in a password protetced zip.file to virus @ avast.com
it is recomended to use a zip program that also encrypt the content (like 7zip)
as some mail scanners (like Gmail) will block sending if it can see that it contain an .exe file