A New Ransomware Threat Is Making the Rounds — Here’s How to Stay Ahead
This week, the Cybersecurity and Infrastructure Security Agency (CISA), along with the FBI, the Department of Health and Human Services, and the Multi-State Information Sharing and Analysis Center, issued a joint warning about a dangerous new ransomware variant known as Interlock.
Interlock has been actively targeting businesses and infrastructure across North America and Europe — and it’s not just a big-business problem.
Small businesses, especially those with:
- Flat networks
- Outdated systems
- Limited IT staff
…are often the easiest targets.
At Wavefinity, we take these alerts seriously. Here’s what you need to know, and what you can do today to protect your systems.
What Is Interlock Ransomware?
Interlock is a strain of ransomware that encrypts files and demands a ransom payment — usually in cryptocurrency — in exchange for the decryption key.
It’s part of a broader rise in highly-targeted, high-impact attacks against both critical infrastructure and small businesses.
Investigators have linked Interlock to:
- Sophisticated social engineering attacks
- Exploitation of known vulnerabilities in outdated software/firmware
Signs You May Be at Risk
CISA has identified Indicators of Compromise (IOCs) and Tactics, Techniques, and Procedures (TTPs) tied to Interlock activity.
While these technical details are for IT professionals, the risk factors are easy to spot:
- No DNS filtering or web application firewall (WAF) in place
- No user training on phishing or social engineering
- Unpatched systems or outdated software/firmware
- Flat network architecture (no segmentation or VLANs)
- No multi-factor authentication (MFA) for email or admin tools
4 Things You Can Do Right Now
Whether you’re a one-person operation or managing a larger team, here are four immediate actions to reduce your risk:
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Lock Down Access Points Use DNS filtering and web application firewalls to stop bad traffic before it reaches your endpoints.
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Update Everything Keep your OS, business apps, firmware, and security tools fully updated. Vulnerabilities are the #1 entry point for attackers.
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Segment Your Network Separate admin devices, guest Wi-Fi, and business-critical systems using VLANs or subnets. If something gets infected, it can’t spread like wildfire.
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Implement Strong Identity Controls Use strong passwords, disable unused accounts, and require MFA for all critical logins — especially remote access and cloud services.
Why It Matters
Ransomware attacks aren’t just disruptive — they can devastate a small business.
Potential impacts include:
- Data loss
- Prolonged downtime
- Loss of public trust
Interlock is just the latest reminder that cybersecurity is business continuity.
If your business handles sensitive data, provides client services, or can’t afford a day of downtime, act proactively, not reactively.
Need Help?
Wavefinity helps businesses in Colorado’s Vail Valley and beyond stay protected with modern, layered cybersecurity strategies.
From ransomware protection to Microsoft 365 security hardening — we’ve got your back.
📞 Contact us today for a risk assessment or a quick chat about your current setup.
Learn More
Read the full advisory at StopRansomware.gov and stay informed on emerging threats.
This Interlock alert is part of an ongoing federal effort to help protect businesses of all sizes from the rising tide of ransomware.
Stay vigilant. Stay patched. Stay protected.
– The Wavefinity Team
