Question: Where can I find this software? Maybe this is not a full-finished software; if it is then do you know any references?

![assimilation](https://i.stack.imgur.com/cPAkX.jpg)

Answer: 
The program has just came into being:

[The Thing Simulator](https://elendir.itch.io/the-thing-simulator)
The exact program doesn't really exist as has been stated

However, the closest thing you can probably get in reality would be a zombie outbreak simulator like [this](http://www.deathtech.com/zombies/) one.