Sandworm’s DynoWiper Attack on Poland’s Power Grid: How Cyberdefenders Stopped a Nation-State Threat
Executive Summary
In late December 2025, Poland’s power sector faced the largest cyberattack in its history, attributed to the notorious Russian state-backed Sandworm group. The attackers deployed a new destructive malware strain dubbed DynoWiper, attempting to disrupt critical energy operations by wiping systems within operational networks. Polish cyber defense teams identified the attack early through advanced threat monitoring and contained the threat before any operational damage occurred. No loss of service or data was reported, and authorities confirmed that core infrastructure remained uncompromised. The incident has intensified scrutiny of nation-state threats to Europe’s energy grid, reinforcing calls for resilient cybersecurity postures across all critical infrastructure assets.
Sandworm’s use of a novel wiper malware and focus on lateral movement echo a sharp uptick in high-impact, geopolitically motivated attacks targeting EU utilities. This case highlights the growing sophistication and persistence of nation-state cyber operations, raising fresh challenges for defenders in the energy sector and beyond.
Why This Matters Now
This attempted attack underscores the heightened risk of state-sponsored cyber operations against energy infrastructure as geopolitical tensions remain high. The emergence of DynoWiper and Sandworm’s evolving tactics reflect a broader trend of disruptive, destructive attacks targeting critical services—making robust, adaptive defenses an immediate priority.
Attack Path Analysis
Sandworm likely initiated the attack via an initial compromise such as exploiting a cloud-exposed service or spear-phishing to gain an initial foothold. After access, the attackers attempted to escalate privileges, possibly abusing identity roles or misconfigurations to obtain broader permissions. Lateral movement within the power sector's environment enabled the adversary to target key workloads and systems, leveraging east-west pathways. The attackers established command and control by creating covert channels to manage malware and issue instructions. Efforts were made to collect and exfiltrate sensitive data using encrypted or covert outbound channels. The final stage involved an attempted destructive impact via DynoWiper to disrupt operations, but the attack was ultimately unsuccessful.
Kill Chain Progression
Initial Compromise
Description
Attackers likely gained initial access via exploitation of an exposed cloud service or targeted phishing against privileged accounts to obtain entry into the power grid's cloud network.
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MITRE ATT&CK® Techniques
Disk Wipe
Service Stop
Ingress Tool Transfer
Command and Scripting Interpreter
User Execution
Valid Accounts
Impair Defenses
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
NIS2 Directive – Incident Handling and Recovery
Control ID: Article 21(2)(d)
CISA Zero Trust Maturity Model 2.0 – Continuous Monitoring and Response
Control ID: Detect and Respond (SOC-2)
PCI DSS 4.0 – Incident Response Plan
Control ID: 12.10
NYDFS 23 NYCRR 500 – Cybersecurity Program
Control ID: 500.02
DORA (Digital Operational Resilience Act) – Operational and Security Risk Management
Control ID: Art. 5(2)(f)
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Oil/Energy/Solar/Greentech
Direct target of Sandworm's DynoWiper attack on Polish power infrastructure requires enhanced east-west traffic security and egress filtering against nation-state threats.
Utilities
Critical infrastructure vulnerability to Russian nation-state actors demands zero trust segmentation and encrypted traffic protection for power grid operational technology systems.
Government Administration
National security implications from largest Polish cyberattack require multicloud visibility, threat detection capabilities, and secure hybrid connectivity for government energy oversight.
Computer/Network Security
Industry must develop enhanced capabilities against wiper malware and nation-state lateral movement tactics targeting critical infrastructure through inline IPS solutions.
Sources
- New DynoWiper Malware Used in Attempted Sandworm Attack on Polish Power Sectorhttps://thehackernews.com/2026/01/new-dynowiper-malware-used-in-attempted.htmlVerified
- ESET Research: Sandworm behind cyberattack on Poland’s power grid in late 2025https://www.welivesecurity.com/en/eset-research/eset-research-sandworm-cyberattack-poland-power-grid-late-2025/Verified
- Researchers say Russian government hackers were behind attempted Poland power outagehttps://techcrunch.com/2026/01/23/researchers-say-russian-government-hackers-were-behind-attempted-poland-power-outage/Verified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Cloud Network Security Framework controls—such as Zero Trust segmentation, east-west traffic security, policy-based egress controls, and inline threat prevention—would have prevented or limited attacker movement and destructive payload delivery. Microsegmentation and high-performance encryption at key points could have contained compromise attempts and exfiltration, reducing the scope and impact of the attack.
Control: Cloud Native Security Fabric (CNSF)
Mitigation: Centralized inline policy enforcement could block unauthorized or abnormal initial access.
Control: Zero Trust Segmentation
Mitigation: Identity-based policy segmentation limits lateral privilege elevation.
Control: East-West Traffic Security
Mitigation: Lateral movement detection and workload microsegmentation block attacker propagation.
Control: Multicloud Visibility & Control
Mitigation: Abnormal command and control patterns are detected and contained.
Control: Egress Security & Policy Enforcement
Mitigation: Outbound data exfiltration is blocked or tightly monitored.
Destructive malware payloads are detected and blocked in transit.
Impact at a Glance
Affected Business Functions
- Energy Generation
- Energy Distribution
- Renewable Energy Management
Estimated downtime: N/A
Estimated loss: N/A
No confirmed data exposure; attack was detected and mitigated before causing disruption.
Recommended Actions
Key Takeaways & Next Steps
- • Implement zero trust segmentation to restrict lateral movement and limit privilege escalation across workloads and accounts.
- • Deploy east-west traffic inspection and microsegmentation to enforce granular policy between regions and critical assets.
- • Enforce outbound (egress) security controls and anomaly detection to monitor and block command and control as well as data exfiltration channels.
- • Leverage inline IPS and centralized policy frameworks for real-time threat detection, blocking known malware like DynoWiper before impact.
- • Enhance visibility and policy automation across multi-cloud environments to ensure rapid detection, response, and continuous posture hardening.
