Attack Surface Analyzer takes a snapshot of your system state before and after the installation of product(s) and displays the changes to a number of key elements of the Windows attack surface. The tool takes snapshots of an organization's system and compares ("diffing") these to identify changes. The tool does not analyze a system based on signatures or known vulnerabilities; instead, it looks for classes of security weaknesses as applications are installed on the Windows operating system.
The tool also gives an overview of the changes to the system Microsoft considers important to the security of the platform and highlights these in the attack surface report. The Microsoft Security Development Lifecycle (SDL) requires development teams to define a given product's default and maximum attack surface during the design phase to reduce the likelihood of exploitation wherever possible. Additional information can be found in the Measuring Relative Attack Surface paper.
Some of the checks performed by the tool include analysis of changed or newly added files, registry keys, services, ActiveX Controls, listening ports, access control lists and other parameters that affect a computer's attack surface.
Download the free tool (x64 and x86) at http://www.microsoft.com/downloads/en/details.aspx?FamilyID=e068c224-9d6d-4bf4-aab8-f7352a5e7d45&displaylang=en