I\'ve seen it happen reasonably often: I write an application in Delphi and when I compile it, the virus-scanner tells me that I\'ve created a virus and then immediately del
plus to what others'v said, modern anti-virus programs rise virus-alert if your programs uses some "suspicious" APIs too ( like URLdownloadFile or other API hooking related ones).
if you google "delphi RAT FUD API undetectable" you'll find many interesting topics .