can anyone tell me about "new folder.exe virus"?

it seems like the “new folder.exe virus” cannot be detected by avast antivirus. can somebody help me. if you do please e-mail me.

Send the sample to virus@avast.com zipped and password protected with password in email body and false positive/undetected malware in the subject. Or you can also add the file to the User Files (File, Add) section of the avast chest and send it from there (select the file, right click, email to Alwil Software). No need to zip and PW protect when the sample is sent from chest.
Manually adding it to the avast chest ‘user files’ section means it can do no harm there and you can periodically scan it to see when it is added to the VPS updates.

You could also check the offending/suspect file at: VirusTotal - Multi engine on-line virus scanner I feel virustotal is the better option as it uses the windows version of avast (more packers supported) and there are currently 30 different scanners.
Or Jotti - Multi engine on-line virus scanner if any other scanners here detect them it is less likely to be a false positive. Whichever scanner you use, you can’t do this with the file in the chest, you will need to move it out.