The log file shows that you are receiving what appears to be a flood of UDP traffic to port 7010. According to this link, UDP port 7010 is used for two purposes: communication with a UPS and the EverQuest online game. My suspicion is that your are facing traffic from the latter.
The log also shows that these packets are being dropped, which is probably the best that you will be able to do from your virtual server:
Quote:
Mar 15 23:03:00 Drop: IN=vmbr0 OUT= PHYSIN=eth0 MAC=00:25:90:56:7d:18 SRC=115.74.3.69 DST=37.59.11.123
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If this traffic is still causing you problems, such as consuming too much resource, I think you will have to take this up with your service provider as there will be nothing further that you can do at your end as the traffic is being filtered by you, but would need to be filtered upstream.