I found a very old backup CD with some of my past projects, among them was “System33r Socks4”. This software can generate a stealthy socks4 server using the included editor tool.
I had a pre-compiled server on the CD and decided to test the detectability at some multi-scanner services, see:
http://jubbads.com/2bh (Virus Total)
http://jubbads.com/2bj (Jotti’s malware scan)
This detection rate is incredibly poor.
(click for bigger screenshot)
Please keep in mind that this server I submitted was compiled in March 2004.