When most people think about a cyberattack, they picture the moment it starts—a phishing email is clicked, a password is stolen, or a laptop gets compromised.
But in reality, that’s rarely where the real damage happens. For attackers, gaining access is just step one. What comes next is far more dangerous—and far less visible.
Once inside your network, attackers typically move quietly from system to system, searching for what really matters: financial data, customer records, backups, and administrative control. This process is known as lateral movement, and it’s often the stage where a minor incident turns into a major business disruption.
The important thing to understand is this: lateral movement isn’t inevitable. With the right approach, it can be detected early and stopped before it escalates.
What Is Lateral Movement—and Why Does It Matter?
Lateral movement is how attackers expand their access after the initial breach. Instead of staying on one compromised device, they move across your network—gathering credentials, exploring systems, and identifying high-value targets.
They’re not just looking for data. They’re looking for control. In many cases, attackers aim for:
- Administrative accounts
- Finance systems
- File servers
- Backup infrastructure
What makes this stage particularly challenging is how normal it can look. Attackers often use legitimate tools and follow patterns that resemble everyday IT activity. Without the right visibility, their behaviour can blend in completely.
From a business perspective, this is where risk multiplies. One compromised device might be manageable—but once an attacker starts moving, the potential impact grows quickly, from isolated disruption to full-scale outage or ransomware.
How Attackers Actually Move Around
Despite the complexity of modern IT environments, the methods attackers use are often surprisingly straightforward. They rely on common weaknesses that exist in many organisations—especially where systems have evolved over time.
1. Using Stolen Credentials
Credentials are the easiest way in—and the easiest way around.
If an attacker gets hold of a legitimate username and password, they can often access other systems without raising suspicion. These credentials might come from phishing, malware, password reuse, or weak administrative practices.
Once inside, attackers can:
- Log into other machines
- Access shared resources
- Attempt to escalate privileges
Because the activity appears legitimate, it can go unnoticed for longer than you might expect.
2. Exploiting Misconfigurations
Misconfigurations are one of the most common—and most overlooked—security gaps.
These might include:
- Overly open internal network access
- Weak or shared admin passwords
- Legacy protocols left running
- Systems missing critical patches
These issues rarely happen by accident. They’re usually the result of practical decisions made over time—keeping systems running, avoiding disruption, or simplifying access for users.
Attackers know this, and they actively look for these weak points.
3. Taking Advantage of Trust and Shared Access
Most businesses are designed for collaboration, not restriction. Shared drives, service accounts, and interconnected systems help teams work efficiently—but they can also give attackers a roadmap.
Once inside, attackers often explore:
- Shared folders with sensitive data
- Configuration files or scripts
- Documentation that reveals how systems are managed
In some cases, they even find embedded credentials that allow them to jump to more privileged systems.
Why SMBs Are More Exposed Than They Think
Small and mid-sized businesses often have more complex environments than they realise—combining cloud services, on-premise systems, remote users, and third-party platforms.
At the same time, resources are usually limited.
This creates a few common challenges:
- Limited monitoring and alerting
- Broad internal access with little segmentation
- Heavy reliance on a small number of admins
- Inconsistent patching and configuration
These aren’t unusual—they’re the reality for many growing organisations. But they do create opportunities for attackers, especially when subtle warning signs go unnoticed.
The good news is that reducing risk doesn’t require a massive overhaul. Focused improvements can have a big impact.
How to Spot and Stop Lateral Movement Early
The key to stopping lateral movement is a combination of visibility and control. You don’t need dozens of tools—you need the right ones, used effectively.
Start with Identity Security
Since most attacks rely on credentials:
- Enable multi-factor authentication (MFA) wherever possible
- Separate admin accounts from everyday user accounts
- Limit privileged access to only when it’s needed
Reducing access reduces opportunity.
Watch What’s Happening on Endpoints
Endpoints are often where lateral movement begins—and where it can be stopped.
Look for tools that can:
- Detect unusual behaviour
- Provide detailed visibility
- Quickly isolate compromised devices
That last point is critical. The ability to contain a device quickly can stop an attack from spreading.
Look for Unusual Patterns
Attackers rarely move completely invisibly—they leave small clues.
These might include:
- Logins at unusual times
- Repeated failed login attempts
- Access to unfamiliar systems
- Unexpected use of admin tools
Even basic monitoring can catch these signals if it’s consistent.
Limit Movement with Segmentation
You don’t need a complete network redesign to make a difference.
Start by:
- Restricting access to critical systems
- Separating backups from the main network
- Limiting communication between user devices
The goal is simple: if one system is compromised, it shouldn’t open the door to everything else.
Be Ready to Respond
Detection only matters if you can act on it.
Clear, simple response plans make a huge difference:
- Who takes action
- What gets isolated
- Which accounts are disabled
- What data needs reviewing
Testing these plans—even informally—helps ensure your team can act quickly when it matters most.
A More Practical Approach to Cyber Defence
No organisation can prevent every attack. That’s not a realistic goal.
What is realistic is limiting how far an attacker can go.
A strong, practical approach focuses on:
- Reducing easy pathways through your network
- Detecting unusual activity early
- Responding quickly and effectively
For most SMBs, the biggest gains come from strengthening identity controls, improving endpoint visibility, and applying simple segmentation where it matters most.
Just as importantly, your security approach needs to be sustainable. If controls are too complex or disruptive, they won’t last.
Final Thought
Lateral movement is where cyberattacks gain momentum—but it’s also where they can be stopped.
By focusing on the right areas, you can contain threats early, reduce impact, and avoid turning a small incident into a major disruption.
If you’re unsure how exposed your business might be, a focused assessment can quickly highlight the gaps that matter most—and the practical steps to fix them.