https://blockchain.info/address/12t9YDPgwueZ9NyMgw519p7AA8isjr6SMw
https://blockchain.info/address/13AM4VW2dhxYgXeQepoHkHSQuy6NgaEb94
https://blockchain.info/address/115p7UMMngoj1pMvkpHijcRdfJNXj6LrLn
Judging by the amounts extorted , this is a very minor hack.
I personally think that they intend to hold onto the BTC until it tends to be a lot, given the issue that BTC grows exponentially