AltoroMutual is an vulnerable-by-design web application created by WatchFire (now AppScan Standard) as a demo test application for their BlackBox Scanner.
The AltoroMutual web application can be reach on http://demo.testfire.net/ and it is commonly used to test BlackBox Scanners (IBM's AppScan Standard Evaluation version is hard-coded to only allow this website)
The C# source code for AltoroMutual is currently not publicly avaialble
There are number of vulnerabilities (as described in the OWASP Top 10) in this application.
The objective on this WIKI page is to provide detailed explantion of its exploit vector and how it could be protected (WAF or code changes)
Here are a number of resources that map the current vulnerabilities in AltoroMutual: