SMBenum (Software Detection) from Jabra on Vimeo.
This is a module from the Browser Exploitation Framework (BeEF) to detect software on the clients machine. This technique uses local rendering of GIF images with SMB within the browser. This was demonstrated during "Unmasking You!" at BlackHat 09 and DEFCON 17 by Joshua "Jabra" Abraham and Robert "RSnake" Hansen.
