Hands connecting network firewall device cables

Several key controls significantly reduce ransomware infections before they detonate, including immutable, tested backups; endpoint detection and response with application allowlisting; phishing-resistant multi-factor authentication; disciplined patching of internet-facing systems; and removing or locking down exposed RDP. Together, these five reduce both the odds of a successful intrusion and the damage when one slips through, letting you recover from snapshots instead of negotiating with criminals. CISA’s StopRansomware guidance and NIST’s Ransomware Community Profile both build their frameworks around this same short list, and Mavericks Office Solutions implements every one of them for small and midsize clients.

TL;DR:

  • Locking down exposed RDP, enforcing phishing-resistant MFA, and verifying endpoint detection and response are critical first steps in ransomware prevention.
  • Regular patching of internet-facing assets and testing immutable backups can close major vulnerabilities before attackers exploit them.
  • Segmentation of networks and deploying decoy assets help contain threats and detect reconnaissance activity early.
  • Focus on collecting logs of suspicious activity and setting alerts for unusual behavior to catch ransomware before encryption begins.
  • Small organizations should prioritize these core controls and consider external help, such as government resources or managed providers, to fill staffing gaps.

Table of Contents

What Should Be Your First Ransomware Prevention Priorities?

You don’t need a 40-point compliance checklist to get meaningfully safer this month. You need five or six actions done well, in the right order, with a named owner for each. Here’s the sequence we’d tackle first if you handed us a network today.

  1. Audit and lock down exposed RDP (owner: network admin; hours to a day). Find every internet-facing Remote Desktop Protocol instance, close what isn’t needed, and put the rest behind a VPN or jump host with MFA required.
  2. Enforce phishing-resistant MFA on all remote access and admin accounts (owner: IT/security lead; days). Prioritize email, VPN, and any cloud admin console first.
  3. Verify EDR is actually running on every endpoint (owner: IT manager; a day or two). Inventories drift. Confirm agent health, not just deployment records.
  4. Turn on immutable backups and run one real restore test (owner: backup admin; one to two weeks). A backup nobody has restored is a hope, not a plan.
  5. Patch every internet-facing asset with a known exploited vulnerability (owner: sysadmin; ongoing, first pass within a week). Check the CVE against CISA’s Known Exploited Vulnerabilities catalog before deprioritizing it.

If your budget is thin, start free. CISA offers no-cost vulnerability scanning for organizations that want an outside look at their exposure, and it’s a reasonable first move before spending anything on new tooling.

Pro Tip: Run the RDP audit and the backup restore test in the same week. They’re unrelated tasks, but doing them together tells you, fast, whether your front door is open and whether your parachute actually opens too.

How Do Ransomware Gangs Get In Through RDP and VPNs?

Exposed Remote Desktop Protocol remains one of the most common ways ransomware operators get their first foothold, largely because it’s easy to find with mass internet scans and often protected by nothing more than a password. CISA’s guidance is blunt on this point: don’t expose RDP to the internet at all. If a remote team genuinely needs it, the fix isn’t a stronger password. It’s structural.

  • Disable RDP entirely wherever it isn’t a business requirement.
  • Where it’s needed, move it behind a VPN or a dedicated jump host rather than exposing it directly.
  • Require multi-factor authentication on every remote session, no exceptions for “just this one contractor.”
  • Enforce account lockout policies so brute-force attempts get shut down automatically.
  • Restrict allowed source IPs to known ranges instead of leaving the door open to the world.
  • Log every RDP connection attempt and route those logs somewhere you’ll actually notice a spike.

CISA and industry guidance point to layered controls, including immutable backups, EDR, and email filtering, as capable of blocking the large majority of ransomware strains before they ever execute. That’s the case for treating access-vector hardening as prevention, not just cleanup.

Other internet-facing services deserve the same scrutiny. Run vulnerability scans on a regular schedule, not just after an incident. A web application firewall (WAF) catches a meaningful share of exploit attempts against exposed apps, and protective DNS services block connections to known malicious domains before a payload can even download. Close ports you don’t use, and if you’re running infrastructure as code, treat configuration drift as a security bug, not a maintenance annoyance. A firewall rule someone “temporarily” opened eight months ago is exactly the kind of gap ransomware operators are scanning for right now.

SMB (Server Message Block) protocol traffic deserves its own line item because it’s how ransomware spreads laterally once it’s inside. Block inbound and outbound TCP port 445 and the older NetBIOS ports (137 to 139) at your network perimeter. There’s rarely a legitimate reason for SMB traffic to cross into or out of your network from the internet. Internally, upgrade every system you can to SMBv3, and turn on SMB signing and encryption where your hardware and licensing support it. This won’t stop an attacker with an initial foothold from trying to move sideways, but it slows them down and gives your detection tools a better chance of catching the attempt before it becomes a domain-wide encryption event.

Why Does Phishing-Resistant MFA Matter More Than Passwords?

Credential theft is the other dominant entry point, and it usually starts with a phishing email, not a sophisticated exploit. The fix isn’t “train harder.” It’s making stolen credentials worthless on their own.

  • Deploy phishing-resistant MFA methods, specifically FIDO2 hardware security keys or certificate-based authentication, rather than SMS codes or app-based one-time passwords, which attackers can intercept or trick users into approving.
  • Separate privileged accounts from daily-use accounts, and give administrators dedicated admin workstations that never touch email or general web browsing.
  • Grant privileged access just-in-time, for a specific task and a limited window, rather than leaving admin rights active around the clock.
  • Monitor privileged session activity so an anomalous login at 2 a.m. from an unfamiliar location gets flagged in minutes, not discovered during an audit three months later.
  • Harden your email gateway with safe attachments and safe links scanning, and block Office macros from running in files that arrive from outside your organization.
  • Implement SPF, DKIM, and DMARC on your mail domains to make it harder for attackers to spoof your own company in phishing campaigns.
  • Turn on mailbox auditing and alerting so unusual forwarding rules or mass downloads trigger a review automatically.

Pro Tip: If you can only fund one identity upgrade this quarter, make it hardware security keys for your admin accounts. Attackers who compromise a help desk credential via SMS interception cannot replicate a physical key they don’t possess.

Microsoft’s security guidance frames this as raising the cost of attack: every layer of friction you add, from least-privilege roles to harder-to-traverse infrastructure, pushes opportunistic attackers toward easier targets. Ransomware crews are largely economically motivated. Make yourself expensive to breach, and a meaningful share simply move on. A hardened email security setup closes off the channel most of these campaigns still rely on first.

Do You Need EDR and Application Allowlisting for Ransomware?

Modern endpoint detection and response (EDR) tools do something antivirus software from a decade ago never could: they watch behavior, not just file signatures. A ransomware binary that’s never been seen before still has to encrypt files, disable shadow copies, or attempt to spread across the network, and EDR’s behavioral heuristics catch that pattern even when the specific malware is brand new. Most EDR platforms can also automatically isolate an infected endpoint from the network the moment they detect suspicious activity, which buys your team time before a single infected laptop becomes a company-wide incident.

  • Deploy EDR across every endpoint, including servers, not just user laptops, since gaps in coverage are exactly where ransomware operators establish persistence.
  • Layer in application allowlisting using tools like Microsoft’s Windows Defender Application Control (WDAC) or AppLocker, which block any executable that isn’t explicitly approved to run.
  • Pilot allowlisting policies in audit mode first, so you can see what would have been blocked before you enforce it and break a legitimate business application.
  • Roll allowlisting out department by department rather than company-wide on day one, since false positives are far easier to manage at a smaller scale.
  • Route EDR alerts into a SIEM (security information and event management) platform or SOAR (security orchestration, automation, and response) tool so a single suspicious detection triggers an automated playbook instead of waiting for a human to notice.
  • Define escalation tiers in advance: who gets paged for a low-confidence alert versus who gets called at midnight for confirmed lateral movement.

The combination matters more than either control alone. EDR is your detection and response layer; allowlisting is your prevention layer, stopping unauthorized code from executing in the first place. Small teams often skip allowlisting because it sounds like a heavy lift, but a phased rollout starting with your highest-risk servers, the ones running financial software or holding sensitive data, gets you real protection within weeks rather than months. Our endpoint detection and response guide walks through deployment sequencing in more depth.

How Often Should You Patch to Prevent Ransomware?

Unpatched software remains one of ransomware’s favorite doors, and the fix is less about patching everything and more about patching the right things fast.

  • Prioritize any CVE listed on CISA’s Known Exploited Vulnerabilities catalog that affects an internet-facing asset. Those get remediated within days, not your next maintenance window.
  • Set a formal SLA for patch deployment based on exposure: critical, internet-facing vulnerabilities patched within 72 hours; internal, lower-risk systems within 30 days.
  • Use automated patch orchestration tools so routine updates roll out on schedule instead of depending on someone remembering to click “install” across dozens of machines.
  • When a patch breaks a legacy application you can’t immediately replace, apply a compensating control, network isolation, disabled remote access, or a WAF rule, rather than leaving the vulnerability open indefinitely.
  • Manage infrastructure through code (IaC) where you can, so a server rebuild doesn’t accidentally reintroduce a configuration flaw you’d already fixed.
  • Consider a managed patching service if internal staff can’t keep pace; a missed patch window is a common way small IT teams fall behind without realizing it.

The goal isn’t a perfect patch record. It’s closing the gaps attackers are actively scanning for before they find them, particularly on anything reachable from outside your network.

What Makes Backups Truly Ransomware Proof?

A backup that ransomware can reach and encrypt isn’t a backup. It’s just another target, and attackers know this, which is why modern ransomware operators specifically hunt for and destroy backup systems before triggering encryption elsewhere. The defense is immutability: object lock or write-once storage that makes a backup file mathematically impossible to alter or delete for a set retention period, even by someone with valid admin credentials.

  • Follow the 3-2-1 rule as a baseline: three copies of your data, on two different media types, with one copy stored off-site or offline.
  • Use immutable, air-gapped storage for at least one backup copy so a compromised domain admin account still can’t touch it.
  • Isolate backup credentials from your general Active Directory environment; a backup system shouldn’t authenticate with the same account an attacker just phished.
  • Encrypt backup data both in transit and at rest, and log every backup operation so an unusual deletion attempt gets flagged immediately.
  • Scan backup sets for malware before restoring them. Restoring an infected snapshot just reintroduces the problem you were trying to fix.
  • Restore test on a real schedule, monthly for critical systems, quarterly at minimum for everything else, not just when an auditor asks.

Industry guidance consistently finds that small businesses testing backups and maintaining an incident response plan recover far faster than those that discover their backup strategy has gaps only after an attack.

Measure your restore tests in business terms, not just technical ones. Your recovery time objective (RTO), how long restoration actually takes, and your recovery point objective (RPO), how much data you’d lose since the last good backup, should be numbers your leadership team has seen and approved, not assumptions buried in an IT runbook. A documented backup strategy that’s actually been restore tested is worth more than a more expensive one nobody has verified.

How Does Network Segmentation Stop Ransomware From Spreading?

Every serious ransomware incident has a moment where the attacker, already inside, tries to move from one compromised machine to everything else on the network. Segmentation is what turns that moment into a dead end instead of a company-wide encryption event.

  • Isolate your highest-value assets, domain controllers, file servers, and backup servers, on their own network segments with tightly controlled access rules.
  • Keep administrative workstations on a separate segment from general user devices, so a compromised laptop in accounting can’t reach the domain controller directly.
  • Build firewall rules and VLAN structures around the principle that east-west traffic (machine to machine, inside your network) should be the exception, not the default.
  • Restrict SMB traffic by role. A workstation in marketing has no legitimate reason to open an SMB connection to a server in finance.
  • Log and alert on any connection attempt that crosses a segment boundary outside of expected patterns.
  • Adopt zero trust networking principles progressively, starting with microsegmentation around your most sensitive systems rather than attempting a full architecture overhaul at once.

Segmentation doesn’t have to mean a rebuild. Even a modest first pass, isolating backup infrastructure and domain controllers onto their own VLANs with strict access control lists, meaningfully limits how far an intrusion can spread before your detection tools catch it. Think of it less as a wall around the whole building and more as locked doors between departments: one breached office shouldn’t grant access to every filing cabinet in the building.

What Logs and Alerts Catch Ransomware Before Encryption Starts?

Ransomware rarely arrives and encrypts instantly. There’s almost always a window, sometimes hours, sometimes days, between initial access and detonation, where the attacker is exploring, escalating privileges, and staging the attack. Catching that window depends entirely on what you’re logging and what you’ve configured to alert on.

  • Collect authentication logs, EDR telemetry, DNS and proxy logs, backup system logs, and privileged access events as your baseline telemetry set.
  • Watch for credential stuffing patterns, repeated failed logins against the same account from varying IP addresses.
  • Flag anomalous RDP or VPN behavior, particularly logins at unusual hours or from geographies your business doesn’t operate in.
  • Alert on unusual SMB access patterns, especially a single account suddenly touching file shares it’s never accessed before.
  • Watch for sudden mass file modifications or renames across a short window; that’s often the earliest visible sign of active encryption.
  • Set retention policies long enough to support an investigation (90 days minimum for most logs) and tune alerts regularly so real signals don’t drown in noise.
  • Wire high-confidence alerts directly into a SOAR playbook or, if you lack in-house capacity, a managed detection and response (MDR) service that can respond around the clock.

The mass file modification signal deserves special attention because it’s often the last chance to intervene before widespread damage. A well-tuned detection rule that flags a spike in file rename or modification activity within a short window, tied to automatic account lockout or network isolation, has stopped incidents that would otherwise have spread to every mapped drive on the network.

What Should Be in Your Ransomware Incident Response Plan?

A ransomware incident is not the time to figure out who calls whom. That decision needs to already be written down, tested, and understood by everyone on the list.

  1. Define roles before an incident happens. Who declares the incident, who communicates externally, who has authority to shut down systems, and who’s the backup for each role if the primary is unavailable.
  2. Set up an out-of-band communications channel now. If your email or chat platform is compromised, your incident response team needs another way to coordinate that doesn’t run through the same infected network.
  3. Preserve evidence before you start remediation. Isolate affected systems rather than immediately wiping them; forensic evidence matters for insurance claims and law enforcement.
  4. Know your law enforcement contact points in advance. The FBI’s guidance for CISOs and the Internet Crime Complaint Center (IC3) are the right first calls, and having those numbers ready before an incident saves critical hours.
  5. Run tabletop exercises at least twice a year, using realistic scenarios that force decisions about restoring services, legal notification obligations, and public communications, not just technical containment.
  6. Capture after-action improvements every time and actually implement them before the next exercise, not just file them away.
  7. Line up an external IR firm and your cyber insurer contact before you need them. Waiting until an active incident to find a forensics firm costs you the hours you can least afford to lose.

Regulatory notification obligations often catch organizations off guard mid-incident. FTC breach notification rules and state-level requirements may obligate you to notify regulators or affected individuals, and your legal counsel should be part of the tabletop exercise, not a phone call you make for the first time during a real breach.

How Do You Reduce Human Risk Without Blaming Employees?

Technical controls only work if the people operating around them aren’t the easiest way in, and phishing remains the starting point for a large share of ransomware incidents. The goal of awareness training isn’t to catch employees making mistakes. It’s to measurably shrink the window where a mistake turns into an incident.

  • Run phishing simulations on a recurring schedule, and track click rates and reporting rates over time as your core improvement metric, not a one-time pass/fail score.
  • Reward employees who report suspicious emails, even false positives, since a culture of reporting is worth more than a perfect click rate.
  • Set minimum security expectations for every vendor and managed service provider with network access: MFA enforcement, patch cadence commitments, and incident notification timelines written into the contract, not assumed.
  • Map governance responsibilities to NIST CSF’s five functions, govern, identify, protect, detect, respond, recover, even for a two-person IT team, so gaps are visible instead of implicit.
  • Assign a named owner for each function, even if one person owns three of them, so nothing falls through simply because “someone” was supposed to handle it.

Pro Tip: A phishing training program that only measures click rates is measuring the wrong thing. Track how fast employees report suspicious emails to your security team; that number predicts real-world response speed far better than a quarterly quiz score.

Third-party risk deserves particular attention for smaller organizations that outsource IT or software support, since a vendor’s weak security posture becomes yours the moment they have access to your network. A documented phishing training program paired with clear vendor security requirements closes two of the most commonly exploited human gaps at once.

What Free Government Resources Help With Ransomware Prevention?

You don’t have to build a ransomware prevention program entirely from commercial tools. Several federal resources exist specifically to help organizations, including small businesses with no dedicated security staff, assess and reduce their exposure at no cost.

  • CISA’s StopRansomware guide lays out the full best-practices framework this article draws from, organized by initial access vector, and is worth bookmarking as your reference document.
  • CISA’s free vulnerability scanning services identify internet-facing weaknesses before an attacker does; request an assessment before you invest in paid tooling.
  • NIST’s Ransomware Community Profile maps specific, prioritized outcomes to the broader NIST Cybersecurity Framework, useful if you need to justify a security roadmap to leadership.
  • The FBI’s ransomware guidance for CISOs covers prevention and response behaviors, including what to do in the first hour of a suspected incident.
  • The Internet Crime Complaint Center (IC3) is the formal reporting channel if you’re ever targeted, and reporting helps law enforcement track ransomware infrastructure across victims.

Request the CISA scan early in your prevention timeline, ideally before you finalize a budget, since the results often reveal which controls deserve priority funding.

How Does a Managed Provider Implement These Controls for SMBs?

Every control in this guide is achievable in-house. The honest question for most small IT teams isn’t whether the controls work. It’s whether you have the staffing to run them all, every week, without gaps.

  • Managed EDR deployment and monitoring, including 24/7 triage of alerts so a suspicious detection at 3 a.m. gets a response instead of sitting in a queue until Monday.
  • Hardened backup architecture built on immutable, air-gapped storage with a documented restore-testing cadence, not a “set it and forget it” configuration.
  • MFA rollout and ongoing administration across every remote access point and privileged account, including hardware security key provisioning.
  • Phishing training program design and delivery, with click-rate and reporting-rate tracking over time.
  • Tabletop exercise facilitation, so your incident response plan gets tested by someone who runs these drills regularly, not once a year under time pressure.

Mavericks Office Solutions runs a local, USA-based help desk with an average response time under 12 minutes, which matters most in exactly the moment a ransomware precursor alert fires. Outsourcing makes sense when your internal team is strong on daily operations but stretched thin on 24/7 monitoring and specialized security tooling, not as a replacement for having any security awareness in-house at all. A ransomware readiness review is the natural starting point before committing to a specific service scope.

Deception Technologies: An Early Warning System Attackers Don’t Expect

Every control covered so far focuses on keeping attackers out or slowing them down. Deception technology takes a different approach: it assumes an attacker will eventually get past your perimeter, and it plants traps designed to catch them the moment they start exploring.

Hand connecting cable to decoy server device

A honeypot, in this context, is a decoy asset, a fake file server, a dummy set of credentials, or a false network share, that has no legitimate business purpose. No authorized user or automated process should ever touch it. The moment something does, you have a near-certain signal of compromise, because there’s no false-positive scenario where a real employee accidentally opens a decoy file share that doesn’t appear in any documentation.

This matters specifically for ransomware because of how the attack typically unfolds. Before encryption starts, attackers usually spend time mapping the network, looking for file shares, backup systems, and domain controllers to target. A honeypot file share, seeded to look valuable and placed where an attacker doing reconnaissance would likely stumble across it, catches that exploration phase, often hours or days before the actual encryption event.

Deception tools also work well as a tripwire around your backup infrastructure specifically, given how often ransomware operators target backups first. A decoy backup credential or a fake backup server that alerts the moment anyone attempts to authenticate against it can catch an attacker in the exact window where stopping them still prevents the worst outcome. For resource-constrained teams, even a single well-placed decoy asset, monitored closely, adds a detection layer that’s cheap to deploy and hard for an attacker to distinguish from the real thing.

Where Do Most Ransomware Prevention Plans Actually Go Wrong?

If you have limited staff and a limited budget, the sequence matters as much as the individual controls. Get backups, EDR, and MFA solid first. Those three, done properly and tested, block or contain the majority of what would otherwise become a full-blown incident. Only after that foundation is genuinely solid does it make sense to move on to internet-facing service hardening and a tighter patch cycle.

Where Do Most Ransomware Prevention Plans Actually Go Wrong? — overview diagram

The mistakes I see repeatedly aren’t exotic. They’re mundane. Backups that were configured correctly two years ago and never restore tested since. EDR agents that were deployed company-wide on paper but have quietly stopped reporting on a chunk of endpoints nobody’s checked. MFA that technically exists but still allows a fallback to SMS codes, which defeats much of the point.

None of this requires a massive budget to fix. It requires discipline and a staged plan with actual milestones, not “we’ll get to it.” Pick one control this month, verify it works end to end, and move to the next. A ransomware prevention plan that’s 80% complete and genuinely tested beats a 100% plan on paper that’s never been checked.

— Jeffrey

How Mavericks Office Solutions Supports Your Ransomware Defense

Every control in this guide is buildable in-house, but staffing 24/7 monitoring, keeping EDR agents healthy, and running quarterly restore tests take dedicated hours most small IT teams don’t have to spare. Mavericks Office Solutions is built to close exactly that gap: a US-based help desk with an average response time under 12 minutes, backed by managed cybersecurity and IT services that cover the priorities in this article directly.

Mavericks Office Solutions

Our team handles managed EDR deployment and monitoring, hardened backup architecture with immutable storage and scheduled restore tests, phishing-resistant MFA rollout, and tabletop exercise facilitation, all without routing your calls through an offshore call center. If your internal team is strong operationally but thin on 24/7 security coverage, a ransomware readiness review through our cybersecurity services is the fastest way to see exactly where your gaps sit. For organizations that want the full picture, our managed IT services fold that security work into a single outsourced IT partnership. Reach out to schedule an assessment and get a specific, prioritized list of what to fix first.

Sources