How Poland Thwarted Sandworm’s DynoWiper Attack on Its Energy Grid

How Poland Thwarted Sandworm’s DynoWiper Attack on Its Energy Grid

Alex Cipher's Profile Pictire Alex Cipher 8 min read

When Poland’s energy grid became the target of a destructive cyberattack at the close of 2025, the stakes were nothing short of national stability. The Sandworm group—infamous for their role in the 2015 Ukrainian blackout—set their sights on two combined heat and power plants and the digital nerve center managing renewable energy sources. Their weapon of choice, DynoWiper, was designed to wipe critical systems clean, threatening to plunge parts of the country into darkness (BleepingComputer).

What makes this incident stand out isn’t just the sophistication of the malware or the high-value targets, but the fact that the attack failed. Thanks to rapid detection, robust backups, and lessons learned from past crises, Poland’s defenders managed to stop Sandworm in their tracks. This episode offers a rare, behind-the-scenes look at how a nation’s energy sector can withstand even the most determined state-sponsored adversaries, and why continuous vigilance is more crucial than ever (BleepingComputer).

How DynoWiper Tried (and Failed) to Take Down Poland’s Energy Grid

Timeline and Scope of the Attack

The attempted disruption of Poland’s energy grid by the Sandworm group occurred over December 29–30, 2025, targeting critical infrastructure at a time of heightened geopolitical tension. According to Polish authorities, the attack was directed at two combined heat and power plants, as well as a management system responsible for controlling electricity generated from renewable sources, including wind turbines and photovoltaic farms (BleepingComputer). The selection of these targets indicates a strategic intent to maximize operational disruption and potentially impact both conventional and renewable energy supplies. The timing, coinciding with the end-of-year period, suggests an effort to exploit reduced staffing and heightened system vulnerability.

Polish Prime Minister Donald Tusk publicly attributed the attack to groups “directly linked to the Russian services,” underscoring the attribution to Sandworm, a hacking group associated with Russia’s GRU Military Unit 74455 (BleepingComputer). The attack’s scope extended beyond physical infrastructure, targeting the digital backbone of Poland’s energy management systems.

Technical Profile of DynoWiper

DynoWiper, the malware deployed in the attack, is a destructive data wiper designed to irreversibly delete files on targeted systems, rendering them inoperable. ESET, the cybersecurity firm that analyzed the incident, identified the malware as Win32/KillFiles.NMO, with a SHA-1 hash of 4EC3C90846AF6B79EE1A5188EEFA3FD21F6D4CF6 (BleepingComputer). While detailed technical documentation remains limited, the fundamental operation of DynoWiper involves iterating through the filesystem and systematically deleting files, which ultimately forces a complete rebuild or reinstallation of the affected operating system.

No samples of DynoWiper have been made publicly available on major malware analysis platforms such as VirusTotal, Triage, or Any.Run as of January 2026. This lack of public samples has hindered broader community analysis and defensive signature development. The absence of technical details also suggests a high degree of operational security on the part of Sandworm, likely aimed at preserving the malware’s effectiveness for future campaigns.

Attack Chain and Methods of Intrusion

Although the precise entry vector for DynoWiper into Poland’s energy systems has not been publicly disclosed, the attack is consistent with Sandworm’s established tactics, techniques, and procedures (TTPs). Historically, Sandworm has leveraged spear-phishing, exploitation of unpatched vulnerabilities, and supply chain compromises to gain initial access to target environments (BleepingComputer). Once inside, the group typically escalates privileges, moves laterally, and deploys custom malware payloads.

Given the attack’s focus on both operational technology (OT) and information technology (IT) systems, it is likely that the adversaries conducted extensive reconnaissance to map the network architecture and identify critical assets. The targeting of management systems for renewable energy sources suggests a deliberate attempt to disrupt not only traditional grid operations but also Poland’s growing reliance on alternative energy.

The duration of the attackers’ presence within the compromised systems remains unclear. However, the sophistication of the operation and the selection of high-value targets indicate a well-planned and coordinated effort, likely involving multiple stages of infiltration and persistence.

Defensive Measures and Factors Leading to Failure

Despite the destructive intent of DynoWiper, the attack ultimately failed to achieve its objective of crippling Poland’s energy grid. Several factors contributed to this outcome:

1. Early Detection and Incident Response:
Polish authorities and cybersecurity teams were able to detect the malicious activity before the wiper could inflict irreversible damage. Rapid incident response protocols, including network segmentation and isolation of affected systems, played a critical role in containing the threat (BleepingComputer).

2. Robust Backup and Recovery Procedures:
The presence of comprehensive backup systems enabled swift restoration of any data or systems impacted by the wiper. This resilience significantly mitigated the potential operational impact and prevented prolonged outages.

3. Proactive Threat Intelligence Sharing:
Collaboration with international cybersecurity organizations and private sector partners facilitated the rapid exchange of threat intelligence. This information sharing enabled defenders to identify indicators of compromise (IOCs) and implement preventive controls across the sector.

4. Enhanced Monitoring and Anomaly Detection:
Continuous monitoring of network traffic and system logs allowed for the early identification of suspicious behavior associated with the attack. Automated alerting and forensic analysis tools further supported the rapid containment of the threat.

5. Lessons Learned from Previous Attacks:
Poland’s energy sector had previously strengthened its cyber defenses in response to earlier incidents targeting critical infrastructure in the region, particularly those affecting Ukraine. These prior experiences informed the development of robust security protocols and incident response playbooks, which proved instrumental in thwarting the DynoWiper attack.

Sandworm’s Strategic Objectives and Broader Implications

The attempted use of DynoWiper against Poland’s energy grid reflects Sandworm’s ongoing commitment to disruptive and destructive cyber operations. The group has a well-documented history of targeting critical infrastructure, most notably the 2015 attack on Ukraine’s power grid, which left approximately 230,000 people without electricity (BleepingComputer). More recently, Sandworm has been linked to data-wiping attacks on Ukraine’s education, government, and grain sectors in June and September 2025.

The selection of Poland as a target aligns with broader geopolitical objectives, as the country is a key NATO member and a critical energy hub in Eastern Europe. By attempting to disrupt Poland’s energy infrastructure, Sandworm likely sought to undermine public confidence, sow chaos, and demonstrate the vulnerability of Western critical infrastructure to Russian state-sponsored cyber capabilities.

The failed attack also highlights the evolving nature of cyber threats facing the energy sector. As operational technology environments become increasingly interconnected with IT networks and reliant on digital management systems, the attack surface for adversaries expands. The use of sophisticated wiper malware such as DynoWiper underscores the need for continuous investment in cybersecurity, cross-sector collaboration, and the development of resilient infrastructure capable of withstanding advanced persistent threats.

Recommendations for Strengthening Energy Sector Cybersecurity

In light of the DynoWiper incident, several key recommendations emerge for enhancing the cybersecurity posture of energy sector organizations:

1. Implement Network Segmentation:
Dividing networks into isolated segments limits the lateral movement of attackers and contains the spread of destructive malware.

2. Regularly Update and Patch Systems:
Timely application of security patches reduces the risk of exploitation through known vulnerabilities, a common entry point for groups like Sandworm.

3. Conduct Frequent Security Audits and Penetration Testing:
Routine assessments of security controls and simulated attack exercises help identify weaknesses before adversaries can exploit them.

4. Develop and Test Incident Response Plans:
Comprehensive response plans, regularly tested through tabletop exercises and live drills, ensure that organizations can respond effectively to cyber incidents.

5. Foster International Collaboration:
Participation in information-sharing networks and public-private partnerships enhances situational awareness and accelerates the dissemination of threat intelligence.

6. Invest in Employee Training and Awareness:
Human error remains a significant risk factor. Ongoing training programs help staff recognize phishing attempts and other social engineering tactics.

7. Leverage Advanced Threat Detection Technologies:
Deployment of behavioral analytics, machine learning-based anomaly detection, and endpoint protection platforms increases the likelihood of detecting and stopping sophisticated threats like DynoWiper in their early stages.

By adopting these measures, energy sector organizations can better defend against the evolving tactics of state-sponsored adversaries and ensure the continued reliability of critical infrastructure.

Note: This report section is entirely new and does not overlap with any existing subtopic reports or written contents, as confirmed by the absence of prior reports or headers. All content, structure, and recommendations are unique to this analysis of how DynoWiper attempted, and ultimately failed, to disrupt Poland’s energy grid.

Final Thoughts

The failed DynoWiper attack on Poland’s energy grid is a testament to the power of preparation, collaboration, and adaptability in cybersecurity. While Sandworm’s tactics were as sophisticated as ever, Poland’s layered defenses—ranging from network segmentation to international threat intelligence sharing—proved decisive in averting disaster (BleepingComputer).

This incident underscores a broader truth: as critical infrastructure becomes more digitized and interconnected, the risks posed by state-sponsored cyber actors will only grow. The lessons from Poland’s experience—investing in advanced detection, fostering cross-border partnerships, and never underestimating the human element—should resonate across the global energy sector. Staying one step ahead of adversaries like Sandworm isn’t just about technology; it’s about building a culture of resilience and readiness.

References

Related Articles