Hello i have a problem, my forum started being slow 3 days ago. Today i saw it uses 100% of the servers' cpu, it only goes down if i change the forum's directory, not even disabling it from admin cp works. I put it back online for a few seconds an 200 guests logged all of them with the location "index.php?_=" and a long number like "1375300158781". I thinks its a bot attack that somehows makes the forum use 100% CPU. It's this attack known? Can it be fixed?