From threatpost.com
The specific type of TCP attack used in the recent spate of DDoS efforts were TCP SYN-ACK reflection attacks.
The last 30 days has seen a renewed increase in distributed denial-of-service (DDoS) activity, according to researchers, who said that they have observed a number of criminal campaigns mounting TCP reflection DDoS attacks against corporations.
Researchers at Radware said that the list of victims include a number of large companies, including Amazon, IBM subsidiary SoftLayer, Eurobet Italia SRL, Korea Telecom, HZ Hosting and SK Broadband.