I'm not sure what they're using but if I recall from when this has come up before Amazon's EC2 ToS prohibits this usasge.
"Nothing in this researcher's work is predicated on the use of Amazon EC2. As researchers often do, he used EC2 as a tool to show how the security of some network configurations can be improved," said Amazon spokesman Drew Herdener.
[1]: http://uk.reuters.com/article/2011/01/07/us-amazon-hacking-i...