Lessons Learned: Cheyenne and Arapaho Tibes Rhysida Ransomware Attack
Credit: The Record (https://therecord.media/cheyenne-arapaho-ransomware-rhysida)
What Happened
A recent ransomware attack against the Cheyenne and Arapaho Tribes highlights a growing and urgent cybersecurity crisis impacting tribal governments across the United States.
According to reporting, the Rhysida ransomware gang claimed responsibility for the attack, demanding 10 Bitcoin (~$660,000) to prevent the release of stolen data.
Initial intrusion detected: December 8, 2025
Systems impacted: Schools, email, phone systems, and critical operations
Major disruption: Tribal schools were forced offline
Response: Systems shut down; federal authorities engaged
Outcome: Tribe refused to pay the ransom
Tribal leadership made a clear and powerful statement:
This attack was treated as a serious criminal act and no payment would be made to attackers.
Why This Matters for Tribal Governments
This incident is not isolated, it’s part of a broader pattern. Tribal governments, like municipalities and school systems, are increasingly targeted because they:
Operate critical infrastructure (education, healthcare, gaming, public services)
Often have limited cybersecurity resources
Maintain valuable financial and personal data
The attackers behind Rhysida ransomware gang have also targeted:
Major corporations
Hospitals and airlines
Government agencies (including transportation departments and cities)
This reinforces a hard truth:
No organization is too small—or too remote—to be a target.
Real-World Impact
Cyber disruptions affect sovereignty, economic stability, and public safety. Like many cyber incidents, this wasn’t just a technical issue, it disrupted real lives:
Students lost access to learning systems
Staff lost communication tools
Government operations slowed or halted
Community trust was tested
Are required to meet federal compliance obligations (e.g., 638 programs, grants, insurance)
Key Takeaways for Leadership
1. Early Detection is Critical
The intrusion attempt was identified early, but it still escalated.
Continuous monitoring (24/7 SOC, endpoint detection, identity monitoring) is essential.
2. Incident Response Planning Matters
The Tribe acted quickly by shutting down systems and coordinating response efforts.
➡ Organizations without a tested incident response plan risk longer downtime and greater damage.
3. Ransomware is a Business Model
Groups like Rhysida ransomware gang rely on pressure tactics:
Data theft (double extortion)
Public leak threats
Operational disruption
Paying ransom does not guarantee recovery and it often increases future targeting.
4. Cyber Insurance & Compliance Are Now Requirements
The Tribe worked with its insurance provider, highlighting the role of:
Cyber insurance readiness
Documented controls
Governance and oversight
Many cyber policies now require alignment with frameworks like CIS Controls v8.
How HOZHO Cybersecurity Helps Prevent This
At HOZHO Cybersecurity, we work with tribal governments, schools, and enterprises to prevent exactly this type of disruption.
Our vCISO Membership Model provides:
Leadership & Governance
Dedicated Virtual CISO
Policy development aligned to CIS Controls v8
Executive reporting and compliance readiness
Protection & Detection
Identity Threat Detection & Response (ITDR)
Email and phishing protection
External attack surface monitoring
Dark web exposure monitoring
Response Readiness
Incident response planning
Tabletop exercises
Real-time incident coordination
People-Focused Security
Security awareness training
Simulated phishing campaigns
The Bottom Line
The Cheyenne & Arapaho incident is a wake-up call:
Cybersecurity is no longer optional, it is essential for long term resiliance. Tribal governments must protect not just systems—but their people, services, and sovereignty.
Know Your Risk
Get your cybersecurity score with a free risk assessment from HOZHO Cybersecurity. Identify vulnerabilities, improve compliance, and strengthen your organization’s security posture today.
We’re offering a Free External Risk Assessment to help your organization understand its exposure:
Identify publicly visible vulnerabilities
Detect misconfigurations and risks
Get actionable recommendations from a vCISO
Schedule your free consultation today. Let’s make sure your organization is not the next headline.