Public incident case studies

Cyber incidents, traced to the consequence.

Public-source analysis focused on what happened, what it cost, which readiness gaps mattered, and what changed afterwards.

The organisations profiled are not and have not been Lykos Defence clients. These case studies are based solely on public-source information and examine publicly documented incident impacts, outcomes, and preparedness considerations.

Historic ransomware & data breach

Change Healthcare

Initial access 12 February 2024 · ransomware and nationwide disruption 21 February

192.7Mpeople impacted by the breachHHS records approximately 192.7 million individuals as affected by the Change Healthcare breach.
US$3.87B+
disclosed response and business-disruption impact
>US$9B
interest-free funding advanced to care providers
9 days
from initial remote access to ransomware deployment
  • Identity and access
  • Third-party risk
  • Operational resilience and business continuity
  • Privacy and data lifecycle
  • Governance
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Production largely restored

Coca-Cola / fairlife

Ransomware disclosed 16 July 2026 · majority production restored by 27 July

U.S.-widefairlife production temporarily suspendedRansomware reached production-related systems and led fairlife to suspend production operations across the United States.
4
U.S. facilities in the recovery
11 days
from disclosure to majority production restored
1
Canadian production network unaffected
  • Operational resilience and business continuity
  • Asset and vulnerability management
  • Incident response
  • Privacy and data lifecycle
  • Process safety
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Resolved enforcement outcome

FIIG Securities

2023 cyber-attack · Federal Court outcome 2026

A$3.0Mcourt-ordered financial outcomeA$2.5M penalty + A$500k ASIC costs
385GB
confidential information stolen
18,000
clients notified
4+ years
cybersecurity failures cited
  • Governance
  • Monitoring and detection
  • Asset and vulnerability management
  • Secure configuration and development
  • Security awareness
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Material impact documented

Latitude Financial

2023 cyber incident · Remediation and investigations ongoing

A$68.3M2023 cyber-related costs and provisionsPre-tax, reported in Latitude’s 2023 Annual Report
7.9M
drivers' licence numbers stolen
6.1M
additional partial records
5–6 weeks
platform restoration
  • Third-party risk
  • Identity and access
  • Privacy and data lifecycle
  • Operational resilience and business continuity
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Recovered; investigation ongoing

Mackay Sugar

Incident disclosed 10 June 2026 · all three mills operational by 26 June

2 millsnormal operations haltedThe incident stopped milling and cane haulage at Farleigh and Racecourse during the crushing season.
16 days
until all three mills were operational
~1,300
farms in the Mackay Sugar supply network
~700,000t
average annual raw sugar production
  • Operational resilience and business continuity
  • Incident response
  • Third-party risk
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Impact known; proceedings ongoing

Medibank

2022 cybercrime event · Regulatory proceedings ongoing

A$160.8Mcumulative disclosed non-recurring cybercrime costsMedibank disclosed A$160.8 million in non-recurring cybercrime costs through FY26.
9.7M
Australians in OAIC allegations
~520GB
data allegedly extracted
No MFA
on VPN, OAIC alleges
  • Identity and access
  • Monitoring and detection
  • Third-party risk
  • Privacy and data lifecycle
  • Evidence preservation and forensic readiness
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Investigation and attribution ongoing

Minnesota Water Systems

Coordinated OT attacks 26–27 July 2026 · investigation and attribution ongoing

30+Minnesota water systems affectedMalicious activity reached technology used to remotely monitor and control community water infrastructure.
100+
internet-exposed U.S. water-sector systems targeted in July
~90 min
to restore Braham’s water plant
US$14,495
proposed replacement of 15 older Alpena cellular modems
  • PLC, HMI and control-system security
  • Asset and vulnerability management
  • Remote access
  • Operational resilience and business continuity
  • Third-party risk
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Regulatory and class-action ongoing

Optus

Data breach 17–20 September 2022 · regulatory and class-action litigation ongoing

A$140Mcustomer response and recovery provisionProvision for identity document replacement, credit monitoring, the independent review, and related response activity.
9.5M+
former and current customer records accessed
2.47M
active subscribers had identity information accessed
4 years
access-control coding error existed before the breach
  • Secure configuration and development
  • Asset and vulnerability management
  • Monitoring and detection
  • Privacy and data lifecycle
  • Governance
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