When was the last time you stopped to think, “What would actually happen to my business if all our files were suddenly locked away?”
That is exactly the nightmare scenario the FBI is warning about right now. They have issued a new alert about a fast-moving ransomware group called Interlock, and while their attacks started in North America, their reach is already expanding into Europe.
If you have not heard of them before, here is what every business owner should know, and what you can do to stay protected.
Who Are Interlock?
Interlock only appeared in September 2024, but they have quickly made a name for themselves by targeting businesses, infrastructure providers, and public services.
Their method is simple but devastating. Once they break in, they:
- Steal sensitive data quietly in the background.
- Encrypt your systems so you cannot access files.
- Demand a ransom, typically with a short deadline of around four days.
If you do not pay, they publish your stolen data on the dark web for anyone to see.
This “double extortion” approach has become the norm for modern ransomware gangs, but what makes Interlock different is their speed and aggression. They move fast, automate their attacks, and use tactics designed to trick even the most cautious employees.
How They Get In
Interlock uses a mix of social engineering and technical deception to break through defences. Their most common tricks include:
- Fake browser or antivirus updates
- Booby-trapped websites that look legitimate
- Malicious email attachments or links
- Compromised remote access systems
Once inside, they install a toolkit of malware designed to steal credentials, spy on activity, and spread across your network before locking down your data.
They are not limited to one platform either. Interlock targets both Windows and Linux environments, which means any business could be at risk, regardless of size or industry.
Why SMEs Are Prime Targets
It is tempting to assume ransomware only affects large corporations that make headlines. The truth is very different.
Small and medium-sized businesses are often the preferred targets because attackers know their security budgets are smaller, and defences can be inconsistent.
Imagine losing access to your client files, invoices, or operational systems overnight. Even if you have backups, the downtime, cost of recovery, and reputational hit can be severe. I have seen businesses spend weeks rebuilding trust with clients after a single incident.
The FBI’s Advice and Why It Matters
The FBI’s latest guidance is refreshingly clear. Their key recommendations mirror the proactive measures we already implement for clients at Nxt Gen IT:
- Keep software patched and updated. Old systems and unpatched devices are an open door to attackers.
- Enable Multi-Factor Authentication (MFA). Adding that extra verification step is one of the simplest ways to stop unauthorised access.
- Use web filtering and firewalls. These block access to known malicious sites before damage is done.
- Segment your network. Isolate systems so that if one device is infected, the whole network is not compromised.
- Invest in threat detection. Modern security tools can identify suspicious activity early and stop it before it spreads.
It might sound technical, but these are straightforward, practical steps that dramatically reduce your risk.
As I often tell clients, prevention costs far less than recovery. The FBI does not issue alerts like this often, and Interlock is not going away any time soon.
How Nxt Gen IT Helps You Stay Secure
At Nxt Gen IT, we help SMEs turn these recommendations into action. Our team works with business owners who do not have in-house IT security expertise but want complete peace of mind that their systems are protected.
Here is what that looks like in practice:
- Managed threat detection and response across Microsoft 365 and local systems
- Automated patching and updates to keep vulnerabilities closed
- MFA and conditional access policies through Microsoft Entra ID
- Network segmentation and firewall management
- Cyber Essentials and Cyber Essentials Plus preparation
We focus on people-first technology, combining reliable security tools with user-friendly training so your team knows how to spot risks before they escalate.
The Bottom Line
Ransomware is not just a distant problem affecting global corporations. It is a real and growing threat to UK SMEs, and Interlock is the latest proof that cybercriminals are constantly evolving.
You do not need to live in fear of the next attack. You just need the right partner, the right systems, and the right habits in place.
Nxt Steps
If you are unsure how resilient your business really is against ransomware, let us find out together.
Book a free security review with Nxt Gen IT. We will assess your current setup, identify weak points, and show you how to strengthen your defences without unnecessary complexity or cost.
Your data is too important to risk. Let us make sure your business stays secure, confident, and operational no matter what comes next.
Ben helps growing businesses turn technology into a driver of performance instead of a barrier. At Nxt Gen IT he works with SME leaders, recruiters, and fast-scaling teams to design solutions that improve reliability, strengthen security, and unlock growth.
With a background in email deliverability and cloud systems, Ben specialises in making sure businesses communicate effectively, keep data safe, and get the most from Microsoft 365. His experience spans solution design, managed IT services, and virtual CIO support, always with a focus on practical outcomes that reduce headaches for business owners.
Ben has supported organisations across the UK, from recruitment agencies struggling with inbox placement to SaaS firms scaling fast, and SMEs needing a trusted partner for their IT. He believes tech is never the end goal: growth is. His role is to make sure technology never gets in the way of it.