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Recommendations to mitigate DDoS threats being made against Australian organisations

The Australian Signals Directorate's Australian Cyber Security Centre (ACSC) is aware of a number of Denial of Service (DoS) for ransom threats being made against Australian organisations, primarily in the banking and finance sector.

What you need to do

Preparing for any DoS attack before it occurs is by far the best strategy, as this sort of incident can be very difficult to respond to once the attack begins. Well-prepared organisations should be able to operate effectively despite these threats and any potential DoS.

We strongly recommend organisations review the ACSC publication Preparing for and Responding to Denial-of-Service Attacks.

If your organisation is affected by a DoS attack, the ACSC recommends:

Talking to your service provider(s) about their ability to immediately implement any responsive actions.

  • Blocking the offending IP address(es).
  • Temporarily transferring online services to cloud-based hosting with high bandwidth and content delivery networks that cache non-dynamic websites.
  • Preferably using multiple major cloud service providers to obtain redundancy.
  • Engage a DoS attack mitigation service for the duration of the incident.

Further information

Read ACSC’s guidance on how organisations can prepare and respond to a cyber security incident.

To report a cybercrime, visit ReportCyber.

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