Can someone help. I am furious. BTCG user/worker benutzer_1 has hacked my antminer and changed a script file somewhere to redirect to his worker. What will BTC Guild do about this? Short of changing my SSH password which I have now done what else can I do?

UPDATE: Config file for cgminer did not show his pool/worker (priority 0) and a reboot has deleted killed his worker. Now very confused.

Thanks