The Worm Simulator is a substantially updated version of the VBSim program released in 1997. VBSim was the first program to “show” the spread of a virus to Symantec customers. The new Worm Simulator takes VBSim to another level, enabling custom configuration of new worm simulations, configuration of custom networks and protection policy, and incorporates impressive new three-dimensional graphics. The simulator comes with simulation files for Blaster, MyDoom, Netsky, Sasser, Slammer, and SoBig. It's just a toy, decent for a high level demo, but unsuitable for anyone doing serious research.