The funds are drained from the ETH that investors have send into the DAO. Technically, the attacker could have sent them all to poloniex but for whatever reason, he decided to put them into a DAO itself that made the obtained ETH illiquid.
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so the whole dumping was just panic? the attacker didnt spent anything?
Yup
I bet he is buying cheap ETH's and DAO's from another account we will never find out!