Well, you can use monit to monitor the checksums of your zones files, and he will send you an alert if the files have changed. This is a nice little tool it worth the look. He can monitor many services and do some actions if a service is missing, send you an email warning and sms very nice.
tripwire" is another method of monitoring files. it works decently enough. The best prevention is to make sure you set up things as securely as possible, and always check for updates/exploits.
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