From power grids and pipelines to meat processing and municipal water, operational technology (OT) is the invisible backbone of modern society. But what happens when these systems—built for uptime and efficiency—become targets? The past decade has shown that OT environments are no longer immune from cyber threats. Here are five major attacks that not only shook industries but redefined how we think about industrial cybersecurity.
1. Colonial Pipeline Ransomware Attack: A cybersecurity wake-up call for critical infrastructure
In May 2021, Colonial Pipeline, a major U.S. fuel supplier, fell victim to one of the most disruptive ransomware attacks in American history. The incident forced the company to shut down pipeline operations spanning 5,500 miles, halting the distribution of nearly 45% of fuel consumed on the U.S. East Coast.
Circumstance
Colonial operated the largest refined oil pipeline in the United States. Despite being a backbone of critical infrastructure, it was not immune to the growing wave of ransomware threats targeting industrial networks. Cybersecurity investments had been made—but the attack revealed critical blind spots in identity and access management.
The Attack
The attackers gained entry through a single compromised VPN password connected to an inactive account, which lacked multi-factor authentication. This lapse enabled the ransomware gang DarkSide to breach Colonial’s IT systems without raising alarms.
After infiltration, the attackers deployed ransomware that encrypted critical business systems, locking employees out of scheduling and billing services. Fearing that operational systems might also be compromised, Colonial proactively halted pipeline operations—a decision that triggered panic buying and regional fuel shortages across 12 states.
Tactics Used
DarkSide used a double extortion approach. Not only did they encrypt systems, but they also exfiltrated over 100 gigabytes of sensitive data, threatening to leak it publicly if the ransom wasn’t paid. This forced Colonial into a corner.
Outcome & Response
Colonial paid a $4.4 million ransom in Bitcoin, later partially recovered by the U.S. Department of Justice. The attack disrupted fuel supply chains, affected airlines, and drove up prices, making headlines globally.
The broader impact? U.S. federal agencies declared the attack a national security issue, issuing new pipeline cybersecurity mandates. The case became a prime example of how weak IT security can threaten OT systems.
2. Triton Malware Attack: The first cyber threat to industrial safety systems
The 2017 Triton malware incident marked the first known cyberattack designed to disable industrial safety systems—a terrifying escalation in the scope of cyber warfare. It targeted a Saudi petrochemical plant and had the potential to cause physical destruction and even loss of life.
Circumstance
The targeted plant used Schneider Electric’s Triconex Safety Instrumented System (SIS) to monitor and automate emergency shutdowns. These systems are intended to be fail-safes, preventing accidents when industrial processes go out of control.
In most cyberattacks, adversaries aim to disrupt operations or steal data. But in this case, the attackers set their sights on the very system designed to protect human life and prevent disasters.
The Attack
Hackers gained access to the SIS via network vulnerabilities, deploying the malware Triton (also known as TRISIS or HatMan). The goal was to reprogram the safety controllers, altering shutdown logic and allowing unsafe operations to continue unnoticed.
A flaw in the malware’s code, however, triggered a system fault that led operators to investigate. This lucky break exposed the attack before any physical damage could occur.
Tactics Used
Triton was engineered to provide persistent access to SIS environments, silently overriding safety protocols. The malware was stealthy and sophisticated, implying nation-state involvement—later believed to be affiliated with Russian or Iranian threat actors.
Outcome & Response
While no lives were lost, the attack sent shockwaves through the industrial cybersecurity community. It revealed that adversaries are no longer just aiming to disrupt operations—they are actively targeting systems that protect human lives.
Schneider Electric, in coordination with government agencies and cybersecurity researchers, conducted a comprehensive investigation. The incident accelerated the push for network segmentation, secure authentication, and continuous threat monitoring in safety-critical OT systems.
Also read: Britain Urges Firms to Prioritize Cybersecurity After Attacks
3. Industroyer 2 Attack: Cyber warfare against Ukraine’s energy infrastructure
In April 2022, the Russian cyber unit Sandworm unleashed a new version of its infamous Industroyer malware against Ukraine’s energy sector. Known as Industroyer 2, the malware was deployed during a period of escalating geopolitical tensions—this time, as part of Russia’s broader military invasion.
Circumstance
The 2016 Industroyer attack had caused a major blackout in Kyiv. Since then, Ukraine had bolstered its cyber defenses, especially around critical infrastructure. But Industroyer 2 brought a more refined and coordinated toolkit to the battlefield.
This time, the target was a high-voltage electrical substation. If successful, the attack could have blacked out regions in the middle of wartime operations, endangering civilians and paralyzing national response mechanisms.
The Attack
Industroyer 2 enabled hackers to send unauthorized commands to industrial control systems (ICS) that operate circuit breakers. It didn’t just take down one substation—it was engineered to simultaneously attack multiple facilities, amplifying its destructive capacity.
The attack was timed for maximum disruption, coinciding with military escalations on the ground.
Tactics Used
Hackers first compromised remote admin credentials using supply-chain vulnerabilities. They combined Industroyer 2 with CaddyWiper, a malware that deleted logs and wiped recovery paths—making forensic analysis and system restoration far more difficult.
Their deep knowledge of Ukraine’s electric grid indicated months of pre-attack reconnaissance.
Outcome & Response
Luckily, Ukrainian cybersecurity defenders caught the attack mid-execution, isolating affected systems and preventing widespread outages. The success was credited to strong internal monitoring, real-time response, and global threat intelligence sharing.
The incident underscored that cyber warfare is no longer theoretical—nation-states now use malware as a frontline tool to cripple civilian infrastructure.
4. JBS Foods Ransomware Attack: A cyber disruption to global food supply chains
In June 2021, JBS Foods—one of the world’s largest meat suppliers—was paralyzed by a ransomware attack attributed to REvil, a Russia-based criminal group. The breach temporarily halted operations across 13 plants in the U.S. and several more in Canada and Australia.
Circumstance
JBS handles a significant share of global meat processing. Its plants manage not just production but also logistics, distribution, and inventory management. A cyberattack at this scale had cascading effects on the global food chain.
The timing was also critical—this was during a period when supply chains were already under strain due to the COVID-19 pandemic.
The Attack
REvil infiltrated JBS’s IT systems using known vulnerabilities, encrypted critical files, and demanded a multi-million-dollar ransom. Production lines ground to a halt, and meat deliveries were delayed, affecting supermarkets, restaurants, and fast-food chains.
JBS responded by shutting down systems as a precaution, triggering global alarm over the fragility of food security.
Tactics Used
REvil’s ransomware was file-encrypting and persistent. Once embedded, it took over systems linked to operations, logistics, and payment processing. Though OT environments were not directly infected, they were rendered inoperable due to IT-OT dependencies.
Outcome & Response
JBS paid $11 million in ransom, citing the need to protect its customers from further disruption. The event spurred the food sector into investing more heavily in endpoint security, segmentation, and real-time monitoring.
It was also a wake-up call for industries that had previously seen themselves as low-risk for cyberattacks.
5. Oldsmar Water Treatment Facility Hack: A near miss in critical infrastructure security
In February 2021, a municipal water treatment facility in Oldsmar, Florida, experienced a chilling cyber intrusion. An attacker gained unauthorized remote access and attempted to poison the town’s water supply by increasing sodium hydroxide (lye) levels from 100 ppm to 11,100 ppm.
Circumstance
The Oldsmar plant used TeamViewer to allow remote administration of its OT systems. While convenient, it lacked hardened authentication and was accessible from outdated versions of Windows software.
A facility operator noticed the attack in real time, watching as a remote user moved the mouse cursor and changed chemical levels in the treatment system.
The Attack
The intrusion lasted under 5 minutes, but the intent was clear: cause mass harm by altering the water’s chemical composition. Thankfully, the operator reversed the changes immediately, preventing contamination.
This attack involved no malware, no ransom, and no phishing—just weak credentials and an unmonitored remote access tool.
Tactics Used
This was a manual attack—no automation or payloads were involved. The adversary simply logged in via a misconfigured TeamViewer instance and changed settings manually.
Outcome & Response
Following the attack, Oldsmar disabled remote access and strengthened network segmentation. The FBI and DHS issued alerts to other municipalities, warning of similar vulnerabilities in water and utility systems.
The near-miss became a rallying cry for basic OT cybersecurity hygiene, especially in smaller towns and rural municipalities that often lack dedicated cyber teams.
Final Thoughts: OT security is no longer optional
These five attacks—ranging from espionage to sabotage—demonstrate that OT environments are squarely in the crosshairs of both cybercriminals and nation-states. As digitization continues, the once-isolated world of industrial systems is now exposed to the same vulnerabilities that plague corporate IT networks.
For security professionals, plant operators, and government leaders, the question is no longer if an OT cyberattack will happen—but when, and whether you’re prepared to stop it.
