No organisation wants to suffer a ransomware infection – but they continue to be one of the most common and damaging cyber threats. Preparation is key. To effectively prevent ransomware attacks, you need to understand how attackers gain access, how they spread, and which security measures block them early.
If you’re already experiencing suspicious activity – such as locked files, ransom demands, or encrypted backup data – you may already be dealing with a cyber attack.
The changing face of ransomware incidents
In 2025, attackers are increasingly using double extortion ransomware: they not only encrypt files with a malicious encryption key, but also steal sensitive data to threaten a data breach. This “pay twice” model amplifies both the economic and reputational impacts of an incident.
Attackers often exploit:
- Phishing attacks with a malicious link or attachment that installs malicious code
- Weak or compromised credentials for remote desktop protocol (RDP) or other remote access
- Unpatched operating systems like Microsoft Windows and outdated security software
- Social engineering and unsafe web browsing habits that lead to malicious sites
Once inside, attackers move laterally through network connections, escalate user permissions on privileged accounts, and target cloud backups, offline backups, and other critical assets to make recovery harder.
Why prevention matters
Ransomware is a form of malicious software that locks up your critical data and demands payment for a decryption key. Many attacks now involve data exfiltration, where criminals exfiltrate data before encrypting it, increasing leverage.
The impact of a ransomware attack includes:
- Disruption of critical systems and corporate network operations
- Costly system recovery efforts
- Regulatory obligations with agencies like the infrastructure security agency or federal bureau
- Long-term harm to reputation and customer trust
By contrast, proactive security measures – such as security awareness training, anti malware software, and resilient backup solutions – dramatically reduce the chance of a successful attack and limit damage.
Eight essential security measures to prevent ransomware
Here are the eight most important steps to reduce ransomware risks:
Multi Factor Authentication (MFA)
Essential for remote access, email, and cloud services.
Stops attackers using compromised credentials.
Patch Operating Systems and Security Software Quickly
Regularly apply updates to Microsoft Windows and applications.
Use vulnerability scanning and automated patching to regularly test for flaws.
Network Segmentation and Access Management
Separate critical systems into secure zones.
Limit user accounts and system administrators to least-privilege access.
Advanced Email and Web Filtering with Anti Malware Software
Block phishing attacks before they reach employees.
Filter malicious sites and suspicious web browsing activity.
Endpoint Security Features and Password Managers
Use EDR to detect abnormal behaviour like mass encryption.
Enforce secure passwords and provide password managers for staff.
Resilient Backup Solution (Offline Backups + Cloud Backups)
Store backups securely and away from the main corporate network.
Regularly test recovery from both offline backups and cloud backups.
Security Awareness Training
Teach staff how to spot social engineering, phishing attacks, and malicious links.
Ensure relevant stakeholders know how to escalate threats quickly.
Cyber Incident Response Exercises
Test your security team, managed service providers, and system administrators with realistic ransomware drills.
Involve IT, legal, and leadership to strengthen your security strategy.
Strengthening network security
To minimise future attacks and limit blast radius:
- Restrict remote desktop protocol to VPNs with MFA and strict access management.
- Monitor network connections for unusual patterns (failed logins, outbound beacons).
- Block access to malicious sites using protective DNS.
Immediate actions if you detect ransomware
If you suspect a ransomware infection on infected systems:
- Isolate affected computer systems from the corporate network.
- Disable or reset user accounts and privileged accounts.
- Preserve forensic evidence for the security team before wiping or rebuilding.
- Notify relevant stakeholders and escalate to your managed service providers or external security services.
Why choose Zenzero for ransomware defence?
At Zenzero, we specialise in helping organisations prevent ransomware and recover from ransomware incidents. Our services cover everything from penetration testing and vulnerability scanning to proactive security strategy design, security awareness training, and 24/7 cyber incident response.
With expertise in network security, security software, and protecting critical assets, Zenzero ensures your organisation is prepared for both current and future attacks. Whether you need to strengthen security features, harden infrastructure security, or recover from a cyber attack, we’re here to support you. Get in touch here.
Frequently Asked Questions
What is the best way to prevent ransomware?
No single tool is enough. A layered approach with MFA, patching, segmentation, anti malware software, and resilient backup solutions offers the best protection.
Can ransomware affect backup data?
Yes. Attackers often target cloud backups and offline backups. Always regularly test your backup solution to ensure system recovery is possible.
Do small businesses need the same protections as enterprises?
Yes – ransomware targets businesses of all sizes. Scaled security services from managed service providers are essential for SMEs.
How long does recovery take?
It varies. With tested security measures, backup data, and a skilled security team, recovery can take days. Without preparation, recovery may stretch into weeks or months.