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This Alert is relevant to Australians who use Unitronics PLCs in their environments which may not have applied appropriate cybersecurity practices and have the devices exposed to the internet.

Background / What has happened?

Mitigation / How do I stay secure?

These mitigations apply to all internet-facing PLCs, not just Unitronics.

Immediate steps to prevent attack:

  • Change all default passwords on PLCs and HMIs and use a strong password. Ensure the Unitronics PLC default password is not in use.
  • Disconnect the PLC from the public-facing internet or filter access to known internet endpoints that require access.

Follow-on steps to strengthen your security posture:

  • Implement multifactor authentication for access to the operational technology (OT) network whenever applicable.
  • If you require remote access, implement a firewall and/or virtual private network (VPN) in front of the PLC to control network access. A VPN or gateway device can enable multifactor authentication for remote access even if the PLC does not support multifactor authentication.
  • Create strong backups of the logic and configurations of PLCs to enable fast recovery. Familiarise yourself with factory resets and backup deployment as preparation in the event of ransomware activity.
  • Keep your Unitronics and other PLC devices updated with the latest versions by the manufacturer.
  • Confirm third-party vendors are applying the above-recommended countermeasures to mitigate exposure of these devices and all installed equipment.

Assistance / Where can I go for help?

Organisations or individuals that have been impacted or require assistance can contact us via 1300 CYBER1 (1300 292 371).

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