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Introduction: The Attack That Looked Like Maintenance
A cyberattack against critical infrastructure does not always begin with an obvious alarm, a dramatic ransomware note, or a sophisticated zero-day exploit. Sometimes it begins with something much quieter: a router, a maintenance connection, a remote-access interface, or a network path that engineers have trusted for years.
That is what makes Poland’s latest energy-sector incident so disturbing.
According to Poland’s CERT, attackers infiltrated a smaller combined heat and power plant serving approximately 50,000 residents after compromising infrastructure connected to a wind farm. They eventually reached the plant’s operational technology environment, interacted with programmable logic controllers, disrupted industrial processes, and attempted to make recovery more difficult.
The most important discovery was not a particular malware sample. It was the route the attackers used.
They exploited an internet-facing Fortinet device, discovered a Teltonika cellular router, established an SSH tunnel, entered a private APN used by the distribution system operator, and eventually crossed toward the plant’s OT environment.
In other words, a network architecture intended to separate and protect operational communications became part of the attack path.
And that lesson reaches far beyond Poland.
The Bigger Picture: Why This Incident Matters
Critical Infrastructure Is Becoming More Connected
Modern energy facilities are no longer isolated industrial islands.
Wind farms, substations, combined heat and power plants, distribution networks, remote terminal units, PLCs, engineering workstations, cellular routers, VPN gateways and cloud-connected management systems increasingly depend on interconnected communications.
That connectivity brings efficiency.
It also creates opportunities for attackers.
A device that appears to be nothing more than a communications bridge can become a stepping stone into an environment where digital commands have physical consequences.
The Target Was a Smaller CHP Plant
The incident involved a combined heat and power facility responsible for supplying heat to roughly 50,000 residents.
That detail is important because critical infrastructure attacks are not limited to enormous national power stations.
A smaller facility can still represent an important piece of local resilience.
If an attacker interrupts industrial processes at the right time, the consequences can extend beyond the organization’s IT department.
They can affect heating, electricity generation, water treatment, industrial production, transportation, communications and public confidence.
The Attack Began Somewhere Else
CERT’s investigation indicates that the intrusion started at a wind farm.
The attackers first compromised an internet-facing Fortinet VPN and firewall device.
From that position, they discovered additional infrastructure, including a Teltonika cellular router.
This is a classic example of why defenders cannot think only in terms of individual assets.
A firewall might be hardened.
A router might be patched.
A PLC might not even have direct internet access.
Yet if those systems are connected in the wrong way, an attacker does not necessarily need to compromise the PLC directly.
They can simply find another route.
The Private APN Became the Unexpected Bridge
What Is a Private APN?
A private APN, or Access Point Name, can provide controlled cellular connectivity between devices and a private organizational network.
In industrial environments, this can be extremely useful.
Remote terminal units, field equipment and other operational devices can communicate over cellular infrastructure without exposing their services directly to the public internet.
But isolation is only as strong as the architecture surrounding it.
The Critical Architectural Mistake
According to CERT Polska, the compromised facility used a Teltonika RUTX50 router with two physical interfaces.
One interface connected to the serial link associated with the RTU.
The second Ethernet interface connected to a VLAN managed by the central firewall.
That design satisfied the
But the investigation found that there were no equivalent requirements governing how the cellular router’s administrative interface should be handled.
That gap became crucial.
Security Requirements Cannot Stop at the Protocol
The organization had defined how operational data should travel.
It had not adequately defined how the device carrying that data should itself be administered.
That distinction can be devastating.
A network can enforce strict rules around DNP3 communications while leaving a router’s management interface insufficiently protected.
The attacker does not need to break DNP3.
They simply attack the infrastructure surrounding it.
From Router Access to the OT Network
SSH Created the Tunnel
After discovering the Teltonika router, the attackers used SSH to establish a tunnel.
That gave them a path deeper into the environment.
Tunneling is particularly dangerous in industrial networks because defenders may see legitimate communications between trusted systems while failing to recognize that the underlying session is being manipulated.
The WAGO PLC Became the Next Step
Once inside the CHP environment, the attackers discovered a WAGO programmable logic controller.
They then used SSH access on that controller to reach the operational network.
This is where the intrusion crossed an important boundary.
The attackers were no longer simply inside corporate or telecommunications infrastructure.
They were interacting with industrial control equipment.
Patience Became a Weapon
The attackers reportedly spent approximately a week conducting reconnaissance.
That period is revealing.
The objective was apparently not to break something immediately.
Instead, the attackers studied the environment.
They identified devices.
They tested connections.
They learned which systems communicated with each other.
They explored the operational network.
Then they acted.
That patience is one of the greatest challenges facing defenders of industrial environments.
The Siemens PLCs Were Put Into Stop Mode
The Moment Digital Access Became Physical Risk
After reconnaissance, the attackers connected to Siemens PLCs.
They switched the controllers into stop mode and set a password that prevented operators from changing their state and control logic.
This is a particularly serious form of interference.
A PLC is not merely another computer.
It can control industrial processes that interact with physical equipment.
When attackers interfere with those controllers, they are effectively manipulating the machinery through software.
The Industrial Process Was Interrupted
The attack affected the steam turbine and water treatment systems.
The cogeneration process was disrupted.
The plant temporarily lost operational continuity.
Fortunately, staff were able to restore affected systems quickly enough to prevent a heat or electricity outage.
That outcome should not be confused with a harmless incident.
The absence of a major outage does not mean the attack was unsuccessful in every respect.
The attackers reached the OT environment.
They manipulated industrial controllers.
They disrupted processes.
And they demonstrated that the architecture could be used to reach systems with physical consequences.
The WAGO Controller Was Deliberately Damaged
Covering Tracks Became Part of the Attack
The attackers also damaged the WAGO controller that had served as a gateway into the network.
They corrupted its partition table, leaving the device unable to boot properly.
Investigators could not recover valuable logs from it.
That created a second problem for defenders.
The incident was no longer simply about restoring the device.
Investigators also had to reconstruct what happened without the evidence that might have been stored on it.
Factory Reset Was Not Enough
The affected organization attempted a factory reset.
But the reset did not repair the damaged partition table.
The controller remained unusable.
This demonstrates an important distinction between recovery and forensic preservation.
A factory reset may sometimes restore functionality.
It does not necessarily recover evidence.
And if a device has been deliberately manipulated, treating recovery as the only priority can destroy valuable information about the intrusion.
The Attackers Did More Than Touch PLCs
Moxa Infrastructure Was Reconfigured
The investigation found that Moxa serial device servers and network switches were reconfigured.
The apparent objective was to interfere with legitimate access.
This shows how attackers can manipulate the supporting infrastructure around industrial controllers rather than focusing exclusively on the controllers themselves.
Industrial Drives Were Also Targeted
ABB and Schneider Electric variable frequency drives were also touched during the intrusion.
Not every attempted connection succeeded.
Some actions were incomplete.
Some access attempts failed.
That is normal in real-world intrusions.
Attackers rarely move through an industrial environment with perfect knowledge.
They experiment.
They encounter obstacles.
They make mistakes.
They try again.
Failure Does Not Mean the Environment Was Secure
Some failed connections might initially appear reassuring.
They should not.
A failed attempt can still reveal information to the attacker.
It can also indicate that the attacker was systematically mapping the environment.
The important question is not simply whether every command worked.
The important question is how far the attacker was able to progress before detection.
The Most Dangerous Vulnerability Was Architectural
No Exotic Zero-Day Was Required
One of the most important lessons from the incident is that the attackers apparently did not need a spectacular zero-day exploit to reach the industrial environment.
They used accessible infrastructure.
They exploited a compromised edge device.
They discovered a cellular router.
They created a tunnel.
They leveraged existing network relationships.
Then they patiently explored the OT environment.
That is a powerful reminder that cybersecurity failures often emerge from combinations of ordinary weaknesses.
Security Is a Chain, Not a Single Device
A perfectly configured PLC does not protect a poorly secured gateway.
A secure private APN does not protect an exposed management interface.
A hardened OT network does not help if an attacker can legitimately tunnel into it.
A patched firewall cannot compensate for excessive trust between network segments.
Industrial security therefore has to be evaluated as a chain.
If one link provides a reliable bridge, the entire architecture can become vulnerable.
Deep Analysis
Defensive Command: Identify Listening Services
On Linux-based industrial gateways or management systems, defenders can review listening services with:
ss -tulpn
This can reveal TCP and UDP services that are actively listening and help identify unexpected administrative interfaces.
Defensive Command: Review SSH Configuration
Because SSH was central to the intrusion path, administrators should examine SSH configuration and authentication logs:
sudo grep -E "^(Port|PermitRootLogin|PasswordAuthentication|AllowUsers)" /etc/ssh/sshd_config
Authentication activity can be reviewed with:
sudo journalctl -u ssh --since "7 days ago"
On systems using traditional authentication logs:
sudo grep -Ei "sshd.(accepted|failed|invalid)" /var/log/auth.log
The exact log location varies by distribution.
Defensive Command: Identify Unexpected SSH Sessions
Active network connections can be inspected with:
ss -tnp | grep ':22'
This does not prove malicious activity, but unexpected long-lived SSH sessions deserve investigation.
Defensive Command: Review Routing Information
A compromised gateway may provide an attacker with a path between network segments.
Defenders can inspect routing tables with:
ip route
For more detailed interface information:
ip addr
The objective is to understand exactly which networks a gateway can reach.
Defensive Command: Inspect Network Interfaces
Industrial gateways should have a documented purpose for every interface.
On Linux:
ip -br addr
can provide a concise overview.
Any interface connecting corporate IT, cellular networks, engineering systems or OT should be mapped and justified.
Defensive Command: Look for Unexpected Tunnels
Defenders should investigate SSH tunneling and port-forwarding activity.
A basic process review can begin with:
ps aux | grep '[s]sh'
And active connections can be examined using:
ss -tunap
The presence of SSH does not automatically mean compromise, particularly in maintenance environments.
The critical question is whether the session corresponds to an authorized person, device and maintenance window.
Defensive Command: Review Firewall Rules
Linux-based gateways can expose active firewall rules through:
sudo iptables -L -n -v
For systems using nftables:
sudo nft list ruleset
Unexpected forwarding rules deserve particular attention.
Defensive Command: Check System Persistence
Attackers who gain access to gateways may attempt to maintain persistence.
Defenders can inspect systemd services with:
systemctl list-unit-files --state=enabled
Scheduled tasks should also be reviewed:
sudo crontab -l
and:
ls -la /etc/cron.
These commands are useful for defensive investigation, not as proof that persistence exists.
Defensive Command: Search for Suspicious Authentication Events
A simple defensive search can help identify repeated failed or unexpected authentication:
sudo journalctl --since "14 days ago" | grep -Ei "failed|invalid|authentication"
In production environments, centralized logging should provide a much stronger source of evidence.
DNP3 Requires Special Attention
DNP3 was designed for industrial communications and remains widely used in energy environments.
Organizations should not assume that using DNP3 automatically makes a network secure.
The surrounding architecture, routing, authentication, device management and segmentation remain critical.
A secure industrial protocol traveling through an insecure architecture can still produce a dangerous outcome.
Private Cellular Networks Are Not Automatically Safe
The incident demonstrates why the phrase “private network” should never become a synonym for “trusted network.”
A private APN can reduce exposure.
It can also create an attractive pathway for an attacker who compromises an authorized endpoint.
Every interface should therefore be treated according to its actual security properties rather than its network label.
OT Segmentation Must Be Enforced Technically
The most important architectural question should be:
Can a compromise of a communications device directly lead to control of industrial equipment?
If the answer is yes, segmentation needs to be reconsidered.
Firewalls, access-control lists, jump servers, one-way architectures where appropriate, strong authentication and carefully controlled management interfaces can reduce the risk.
Maintenance Access Deserves Zero Trust
Industrial organizations frequently depend on remote maintenance.
That creates a difficult balance.
Engineers need access.
Vendors need access.
Operators need access.
Attackers want exactly the same thing.
Remote access should therefore be temporary, authenticated, logged and limited to the minimum resources required for the task.
Logging Must Survive Device Destruction
The WAGO controller incident highlights another major weakness.
If the compromised device contains the only useful evidence, destroying or corrupting that device can erase the defender’s visibility.
Critical infrastructure operators should therefore prioritize centralized logging.
Logs from gateways, firewalls, authentication systems, VPNs and network sensors should be stored independently from the devices generating them.
The Human Element: Why the Incident Was Initially Misunderstood
It Looked Like a Contractor Problem
During maintenance work, personnel initially believed that the process interruption might have been caused by an engineering mistake.
That assumption was understandable.
Industrial environments experience configuration errors, equipment failures and maintenance problems regularly.
But it demonstrates how cyberattacks can hide behind ordinary operational explanations.
The Difference Between Failure and Attack
A machine stops.
An engineer investigates.
A configuration is changed.
A controller becomes inaccessible.
At first glance, this can look exactly like a technical accident.
The difference is discovered when multiple anomalies are connected.
Unexpected remote access.
Unusual configuration changes.
Multiple devices affected.
Controllers placed into stop mode.
Authentication changes.
Network equipment reconfigured.
A device deliberately damaged.
Together, those indicators form a very different story.
What Undercode Say:
- The Router Was More Important Than the PLC
The most revealing component of this attack may not have been the Siemens PLC.
It was the network architecture surrounding it.
2. Attackers Follow Trust
Attackers rarely care whether a device is called IT, OT, telecom or maintenance infrastructure.
They follow whatever relationship gives them the next level of access.
3. Private Does Not Mean Trusted
A private APN can provide useful isolation, but it cannot compensate for weak endpoint security.
4. Administrative Interfaces Are Often Forgotten
Organizations carefully define industrial protocols while neglecting the management interfaces of the equipment carrying those protocols.
5. Cellular Routers Deserve Enterprise-Level Security
Industrial cellular routers should be treated as security-critical infrastructure, not disposable communications equipment.
- The Edge Is Now Part of OT Security
The security boundary no longer ends at the industrial firewall.
Routers, VPNs, serial gateways and remote-access systems can all become part of the OT attack surface.
7. Reconnaissance Was a Major Warning
The week-long reconnaissance period shows why early detection matters.
An attacker who spends days exploring the network is potentially preparing for a more damaging operation.
8. Time Can Favor the Attacker
The longer an intruder remains unnoticed, the more they learn.
Knowledge of industrial dependencies can be more valuable than a new exploit.
- OT Attacks Do Not Need Immediate Destruction
An attacker can first map the environment.
Then manipulate communications.
Then interfere with controllers.
Then disrupt physical processes.
10. Failed Attacks Still Generate Intelligence
Even unsuccessful connections tell an attacker something about the environment.
Defenders should therefore monitor failed access attempts, not just successful ones.
11. PLC Credentials Need Special Protection
Controller credentials should never be treated like ordinary workstation passwords.
Access should be tightly controlled and monitored.
12. Password Changes Can Become a Weapon
The attackers used password protection to prevent operators from changing controller state and logic.
That turns a normal security mechanism into an operational obstacle.
13. Recovery Planning Must Include OT
Restoring a server is not the same as restoring an industrial process.
Recovery procedures need to account for controllers, drives, HMIs, communications equipment and safety dependencies.
- Factory Reset Is Not a Complete Recovery Strategy
A reset may restore configuration.
It may not recover evidence.
It may not repair deliberate filesystem or storage corruption.
15. Forensic Preservation Matters
Investigators need independent evidence sources before destructive recovery actions are performed.
16. Centralized Logging Is Essential
Critical evidence should not live exclusively on potentially compromised field devices.
17. Network Diagrams Must Reflect Reality
Security teams should periodically verify that actual network connectivity matches documented architecture.
18. Forgotten Connections Are Dangerous
The undocumented Ethernet connection can be more dangerous than the documented industrial protocol.
19. Segmentation Must Be Tested
A diagram showing separation is not enough.
Organizations should test whether the separation actually prevents lateral movement.
20. Vendor Access Requires Strong Controls
Remote vendor access should not become a permanent pathway into operational networks.
21. Temporary Access Should Actually Expire
Accounts and tunnels created for maintenance should have automatic expiration wherever practical.
22. Monitoring Must Cover Industrial Equipment
Traditional endpoint security cannot see everything happening inside PLCs, RTUs and serial gateways.
23. Industrial Network Detection Is Becoming Essential
Network monitoring can identify unusual controller access, scanning, protocol behavior and configuration changes.
24. Energy Operators Need Attack-Path Thinking
The right question is not simply “Is this device vulnerable?”
It is “If this device is compromised, where can the attacker go next?”
- The First Compromise May Be Far From the Final Target
The attack reportedly began at a wind farm and eventually reached a CHP plant’s operational environment.
That illustrates why organizations must understand interconnected infrastructure.
- Renewable Energy Is Part of the Same Security Ecosystem
Wind farms, solar facilities, substations and CHP plants cannot be treated as isolated security problems.
27. Attackers Exploit Complexity
Every additional gateway, router and management platform introduces another relationship that must be secured.
28. Simplicity Can Be a Security Advantage
Fewer pathways can mean fewer opportunities for lateral movement.
29. Industrial Convenience Can Create Hidden Risk
A connection added to make maintenance easier can remain years after its original purpose has been forgotten.
30. Documentation Is a Security Control
Knowing exactly why an interface exists is part of securing it.
31. Incident Response Must Include Engineers
Cybersecurity teams cannot investigate industrial attacks effectively without understanding the physical processes involved.
32. Engineers Need Cybersecurity Awareness
Likewise, engineers should understand that unexpected controller behavior may be evidence of compromise.
33. Cybersecurity and Safety Are Converging
Once malicious commands can affect physical processes, cybersecurity becomes part of operational safety.
- The Absence of an Outage Is Not Proof of Failure
The plant avoided a major heat or electricity interruption.
That is fortunate, but it does not eliminate the significance of the intrusion.
35. Attackers May Learn From Every Attempt
Even when an operation does not achieve its maximum objective, adversaries can collect valuable information for future campaigns.
36.
ESET’s separate analysis attributed the late-2025 Polish energy attack involving DynoWiper to Russia-aligned Sandworm with medium confidence.
That connection places the broader activity within a history of destructive attacks against energy infrastructure.
- The 2015 Ukraine Attack Remains a Warning
The anniversary timing highlighted by ESET is especially striking because Sandworm has previously been associated with attacks against Ukraine’s electricity infrastructure.
38. Destructive Malware Changes the Threat Model
When attackers combine network intrusion with destructive tooling, the objective may move beyond espionage toward disruption or sabotage.
39. Critical Infrastructure Needs Defense in Depth
There should never be one security control standing between an attacker and industrial equipment.
40. The Biggest Lesson Is Architectural
The most frightening aspect of this incident is that it demonstrates how ordinary infrastructure can become an extraordinary security risk.
The attacker did not necessarily need to defeat every security mechanism.
They needed to find the connection that trusted them enough to move forward.
The Sandworm Connection Adds Another Layer
DynoWiper and the December 2025 Campaign
The broader Polish energy-sector activity also drew attention from ESET, which linked a separate late-2025 campaign to the Russia-aligned Sandworm APT with medium confidence.
Researchers identified a destructive wiper known as DynoWiper.
The malware was associated with an attempted attack against Poland’s energy sector on December 29, 2025.
Destructive Intent Matters
ESET’s analysis reportedly found architecture consistent with destructive behavior.
Even though no successful widespread disruption was confirmed from that activity, the presence of a destructive wiper changes how defenders should interpret the threat.
The objective of such malware is not simply to steal information.
It can be designed to damage systems or make recovery more difficult.
Timing Increased the Risk
The campaign occurred during the winter period, when energy infrastructure can be particularly sensitive to disruption.
It also coincided with the tenth anniversary of the 2015 cyberattack against Ukraine’s power grid associated with Sandworm.
That historical context makes the Polish incidents particularly significant for European energy operators.
Why This Attack Could Have Been Much Worse
Heat Demand Creates a Unique Risk
A CHP facility is not simply another industrial business.
Its operation can directly affect heating services.
An interruption during severe winter conditions could therefore create consequences beyond lost production.
Industrial Processes Are Interdependent
The steam turbine, water treatment, generation systems, PLCs, drives and communications infrastructure are connected through operational dependencies.
Disrupting one component can create secondary effects elsewhere.
Attackers Were Already Inside the Control Environment
This is perhaps the most important point.
Once attackers can communicate with PLCs and industrial drives, defenders are no longer dealing with a conventional corporate intrusion.
The attacker has crossed into a domain where software commands can influence machinery.
✅ Attackers Reached the OT Environment
The supplied CERT account states that attackers moved from compromised network infrastructure through a cellular router and eventually reached industrial control systems, including PLCs.
The incident therefore represents more than a conventional IT compromise.
✅ Industrial Processes Were Disrupted
The report describes Siemens PLCs being placed into stop mode and interference with the steam turbine, water treatment system and cogeneration process.
However, the facility restored affected systems quickly enough to avoid a confirmed heat or electricity outage.
✅ The Private APN Was Part of the Attack Path
CERT specifically identified the use of the private APN architecture as an unusual element of the intrusion.
The important issue was not that private APNs are inherently insecure, but that the surrounding architecture created an unexpected path into the operational environment.
✅ WAGO Equipment Was Damaged
The report states that attackers corrupted the partition table of a WAGO controller used as a gateway, preventing it from booting normally.
The attempted factory reset did not repair the damage.
✅ ESET Linked DynoWiper to Sandworm With Medium Confidence
ESET reportedly attributed the separate DynoWiper-related operation to the Russia-aligned Sandworm APT with medium confidence.
That attribution should be distinguished from absolute proof of responsibility.
Prediction
(+1) Industrial Network Segmentation Will Become More Aggressive
Energy operators are likely to move toward stronger separation between corporate IT, cellular communications, engineering systems and OT.
The concept of “trusted internal network” will continue to lose relevance.
(+1) Cellular Routers Will Receive More Security Attention
Industrial routers and gateways are likely to receive the same security scrutiny traditionally given to firewalls and VPN appliances.
Their administrative interfaces will increasingly become part of formal security audits.
(+1) OT Monitoring Will Become Standard
More energy companies will deploy monitoring capable of detecting unusual PLC access, unexpected configuration changes and suspicious remote sessions.
(+1) Maintenance Access Will Become More Temporary
Permanent remote-access pathways will increasingly be replaced with controlled, time-limited access that can be automatically disabled after maintenance.
(-1) Attackers Will Continue Looking for Trusted Network Bridges
As defenders strengthen conventional internet-facing systems, attackers are likely to concentrate more heavily on overlooked infrastructure such as cellular gateways, remote-access systems and vendor connections.
(-1) Small Facilities May Remain Attractive Targets
Smaller energy facilities may have fewer cybersecurity resources while still controlling systems with significant physical consequences.
That combination makes them appealing stepping stones for sophisticated attackers.
The Final Lesson: The Quietest Device May Be the Most Dangerous
A Router Can Become a Weapon
The Polish incident offers a powerful warning for every organization operating critical infrastructure.
The most dangerous device in an industrial network is not necessarily the one running the most important software.
Sometimes it is the device nobody thinks about.
A cellular router.
A serial gateway.
A remote maintenance appliance.
A firewall rule.
An SSH account.
A forgotten management interface.
Any of these can become the bridge between an attacker and the physical world.
The Real Battlefield Is the Connection Between Systems
Attackers did not need to start by controlling a turbine.
They needed to find a route toward it.
That route reportedly passed through an internet-facing security device, a cellular router, a private APN, a gateway controller and eventually the OT environment.
Every step represented another opportunity for detection.
Every overlooked trust relationship represented another opportunity for the attacker.
Poland’s Warning Extends Beyond Poland
The significance of this incident is therefore much larger than one CHP plant.
Energy infrastructure across Europe increasingly depends on remote communications, cellular connectivity and distributed industrial systems.
The same architectural assumptions can exist in many countries.
The same forgotten interfaces can exist in many facilities.
And the same difference between “maintenance problem” and “cyberattack” can determine whether an organization detects an intrusion early or discovers it only after machines begin behaving unexpectedly.
Security Must Follow the Entire Attack Path
The lesson is ultimately simple.
Do not secure only the firewall.
Do not secure only the PLC.
Do not secure only the private APN.
Secure the path between them.
Because in modern critical infrastructure, the attacker may not need to break through the front door.
They only need to discover the side door that everyone forgot was connected to the control room.
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