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You actually have several options:
1) You can run around screaming like your hair's on fire which will only make matters worse .
2) You could unplug the system and restore it from backup and hope your backups go far back enough.
3) You could launch a formal forensics investigation involving forensics investigators from private firms or even law enforcement if it's bad enough.
The thing is, you have to plan ahead for this type of situation so you're well-prepared when and if something like this happens to you. This will require working with the right people in your organization (IT, security, HR, PR, customer service, operations, and legal) to put together an incident response plan that makes sense for your business.
The best offense is a good defense.
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