I’ve been having the same problem, I work in Visual Studio 2012 writing VB.NET programs and Avast keeps snatching my compiled programs and say they have Win32:Evo-gen[Susp].

This started about a month ago and is getting worse, and makes working very difficult, Avast doesn’t even seem to take notice of any exclusions I setup, I’ve told it to ask what to do when it finds a suspicious file, but no it just does it’s own thing.

I have scanned the file with Avast, result is no threat found, I’ve uploaded the file to Virus Total and 47 virus scanners say it’s clean.

See my thread here

Edit:

Actually looking in the virus chest, this has been happening since December 2012, it’s littered with my programs and nothing much else.