Most manufacturing ransomware attacks do not begin on the production floor. They sneak inside the corporate IT systems through a compromised credential, an exposed VPN service, or an overlooked vulnerability.
From there, attackers don’t immediately encrypt files or disrupt production. They move deliberately. They study the environment. They identify where critical systems connect.
By the time production is impacted, the attackers have already mapped the terrain.
The manufacturing sector experienced a 61% surge in ransomware attacks last year. What separates a contained incident from a full production shutdown is not the firewall - it’s whether the activity was detected before the attack crossed from IT into operational systems.
To really understand the risk, you have to look at what happens immediately after someone gets inside your network.
Because most ransomware attacks in manufacturing don’t unfold randomly. They follow a pattern. And that pattern usually plays out in the first 72 hours.
Let’s break down what typically happens during that initial window.
Hour 0-24: Initial Access & Foothold
In the first phase of a manufacturing ransomware attack, attackers are not deploying ransomware. They are establishing control.
How initial access happens -
Exploited vulnerabilities (32%) – commonly unpatched VPN appliances, firewall devices, or exposed RDP services.
Phishing and social engineering (23%) – often targeting finance, procurement, or plant management users.
Compromised credentials (23%) – reused passwords or credentials purchased from initial access brokers.
In practical terms, this often looks like a VPN device that hasn't been patched due to production constraints, a Microsoft 365 account without MFA, and a vendor remote access account that was never revoked.
None of these immediately disrupt production.
Which is exactly why they’re effective.
What attackers do in the first 24 hours-
Once inside the network, attackers typically:
Establish persistence –
They create backdoor access methods to ensure they can reconnect even if credentials are reset.
Harvest credentials –
Using tools designed to extract cached passwords and tokens from memory.
Escalate privileges –
Their objective is domain admin or equivalent administrative access.
Establish command and control communication
This allows them to remotely operate inside the network without triggering obvious alarms.
During this stage, operations continue normally. Production runs, orders ship, and no alarms go off on the plant floor. But from a security standpoint, the organization is already compromised.
Once attackers obtain elevated privileges, their focus shifts from “Can we get in”? to “how far can we go?”. The next phase is where the manufacturing environments become uniquely vulnerable. Because that’s where attackers begin looking for the bridge between IT and OT.
Day 1-3: Lateral Movement & Reconnaissance
If the first 24 hours are about gaining access, the next 48 hours are about control.
By this stage, attackers have elevated privileges inside the IT network – often domain-level access. That changes the nature of the incident entirely.
What happens during lateral movement
Mapping the Network Environment
The first thing attackers typically do is learn how the internal network is structured.
They begin identifying systems such as:
Domain controllers
File servers and shared storage
ERP and finance systems
Remote access gateways
Backup infrastructure
Engineering workstations
This process helps them understand how authentication works across the environment and which systems provide broader administrative control.
For attackers, the objective is simple:
Understand the environment well enough to move without being noticed.
Finding the IT-OT Bridge
For manufacturing organizations, one discovery matters more than anything else the connection between IT systems and operational technology.
Most production environments are no longer fully isolated. Over time, integrations are introduced for efficiency and visibility – MES systems pulling data into ERP platforms, engineering laptops used for both network and equipment configuration, vendor VPN connections for diagnostics, or data historians feeding production metrics into analytics dashboards.
From an operational standpoint, these connections make perfect sense, but from an attacker’s perspective, they act as a pathway.
Attackers now have a potential route towards systems that influence production.
Targeting High-impact systems
The attackers map the connections and simultaneously identify the systems that will give them the most leverage later.
Backup servers are usually high on the list. If ransomware is going to succeed, recovery needs to be limited. That’s why attackers often attempt to access, disable, or encrypt backup repositories before the attack even begins.
The more valuable the data, the greater the pressure during ransom negotiations.
They look for systems that contain valuable operational or business data, including:
Engineering designs
Production documentation or recipes
Customer contracts and financial records
Shared internal file storage
This stage is particularly risky because nothing appears unusual from an operational standpoint. From the plant floor, everything looks routine.
But behind the scenes, attackers may already have a detailed map of the network and a clear understanding of where the most damaging points of failure exist.
Not sure whether your IT and OT environments are properly segmented — or whether you'd even detect lateral movement if it was happening right now? Our ransomware readiness checklist walks through exactly these questions. Download the 2026 Manufacturing Report and complete the 15-minute self-assessment inside.
Manufacturing organizations often have attackers inside their environment for several days before ransomware is deployed.
Once attackers confirm they can reach critical systems and limit recovery options, their objective shifts. Reconnaissance ends and execution begins.
Day 3-30: Encryption & Production Shutdown
Once attackers have mapped the environment, confirmed access to critical systems, and identified backup infrastructure, the attack moves into its final stage. This is where the disruption begins. Before ransomware is actually deployed, attackers usually take a few steps to make sure recovery will be difficult.
The backup environment is often the first target, but security tools can also become a target during the stage. If attackers have administrative privileges, they may try to disable endpoint protection or monitoring systems that can interfere with the encryption process.
Once attackers are confident they have enough control, they deploy the ransomware payload across the network.
Instead of targeting a single machine, modern ransomware attacks typically spread quickly through multiple systems at the same time. Within minutes, files begin becoming inaccessible, shared folders stop responding, applications fail to launch, and systems start returning error messages. And eventually, the ransom note appears.
The Cost of Downtime
For manufacturers, the real cost of ransomware is rarely just the ransom itself. The largest impact usually comes from operational disruption.
Industry estimates place the average downtime cost for manufacturing at roughly $260,000 per hour. Depending on production volume, supply chain commitments, and contractual obligations, the financial impact can escalate quickly.
Missed production targets can trigger delayed shipments, contractual penalties, and strained customer relationships. Even after systems are restored, returning to full production capacity often takes additional time.
How Manufacturers Can Reduce the Risk of a Production Shutdown
After seeing how ransomware attacks unfold, one thing becomes clear: most incidents are not the result of a single mistake. They happen because small gaps exist across multiple areas like network visibility, access control, backup protection, or monitoring.
Individually, those gaps may seem minor. But when attackers move through an environment over several days, those weaknesses start to compound.
That’s why resilience in manufacturing often depends on understanding where the biggest risks actually exist even in the tiniest gaps.
The most common gaps we see in manufacturing environments-
Network segmentation between IT and OT environments is often incomplete, allowing attackers to move between systems more easily.
Remote access for vendors or contractors sometimes remains active long after projects are finished.
Backup systems connected to the same network as production infrastructure, making them vulnerable during an attack.
Security monitoring focuses primarily on traditional IT systems while operational environments receive little visibility.
Before investing in new tools or major infrastructure changes, most organizations benefit from simply understanding where their current exposure lies.
Questions worth asking include:
Are IT and OT environments properly segmented?
Do we know which systems provide a bridge between networks?
Are backups isolated and protected from ransomware?
Would we detect unusual lateral movement inside the network?
If systems were encrypted today, how quickly could we recover production?
If your team can't confidently answer these questions, you're not alone — and now is the right time to find out where you stand.
We built a practical ransomware readiness checklist specifically for manufacturing environments. It covers six areas — network segmentation, remote access controls, backup protection, monitoring visibility, incident response, and operational recovery — and takes about 15 minutes to complete.
It's included inside our 2026 Ransomware in US Manufacturing Report, which you can download here.
If you'd prefer to work through your environment with an OT security specialist rather than on your own, you can request a complimentary security assessment. We'll map your current exposure across IT and OT systems and give you a clear picture of where the gaps are.
Two options. Both free. One goal: find the gaps before an attacker does.
