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10.5.8. Recovering from intrusion

In short, stay calm. Then take the following actions in this order:

  • Disconnect the machine from the network.

  • Try to find out as much as you can about how your security was breached.

  • Backup important non-system data. If possible, check these data against existing backups, made before the system was compromised, to ensure data integrity.

  • Re-install the system.

  • Use new passwords.

  • Restore from system and data backups.

  • Apply all available updates.

  • Re-examine the system: block off unnecessary services, check firewall rules and other access policies.

  • Reconnect.

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