there is a way... look in to your log in the pb folder of server control panel... you should see ip address of all people connected to your server... copy the ip of the intruder and paste it to Google to see from witch provider he got his ip from... then just send email to that provider with ip and time of connection (time is in the log) and provider will lock his internet connection because rcon hax is forbidden... it is a sort of DDOS attack...

there is another way, but you can not do it, your server provider should do it

netslider

i feel your pain mate,ive had it done to me and as i was new to owning servers i had to do a full server re-install ect so i know its a pain.

As serafian says make sure you check your logs and find the intruder,but i find that is better than google as it gives you detailed info about the ip you are tracking,sort of cuts down the leg work you need to do

hope this helps

loon