We won't know until the datacenter clears the information to us(generally after the abuse report is filed and acted on).
The botnet was well over 300IPs (how many I can personally track without their tools), so it was someone who most likely hired a botnet for a brief period to cause issues.
The target was random Ports and IP on the machine from within those 300 IP, so currently I don't have any hunches on who the real target was.
If you had planned a large event today, or (most common) banned someone, please let me know.
Hired botnets generally do a very good job at not leading on to who was behind it, but with a motive it becomes night and day.