From http://www.pcinternetpatrol.com :

pcAudit™ is a free security evaluation program, for personal computers, developed by Internet Security Alliance, Inc.

How it works

pcAudit™ is a program developed to simulate an attack by a "hacker". To determine the status of security on this computer, pcAudit™ will try to send data from this computer to Internet Security Alliance's server. If successful it means you either do not have a security program installed, or your present program was ineffective in blocking the data sent from your computer to Internet Security Alliance's server (which it absolutely should have). In either case you have a security problem.

A little more technical

Our research shows that ".dll" files sending and receiving data, to and from the Internet, outnumber ".exe" files by 2 to 1 margin.

Using a "dll" file as a "payload", pcAudit™ will test for vulnerabilities exploited by such notorious malicious programs as "Happy99" or recent "Sircam", overlooked by most personal and corporate firewalls.

Download: http://www.pcinternetpatrol.com/downloads/pcaudit.exe

I see that it passed through my sygate firewall and is there anyway to defend against it?