Ransomware attacks are on the rise in Australia, and those operating in regulated industries face higher risks. When a ransomware infection hits a financial services firm or a healthcare provider, the fallout is legal and reputational.
Confidential records are locked. Recovery timelines are measured in days, not hours. And the cost of paying the ransom is only part of the problem.
An effective ransomware protection strategy is built on a defined set of security controls that are tested, integrated, and aligned with compliance requirements.
This article outlines seven critical controls every regulated business in Australia should implement to reduce the risk of ransomware infection and ensure reliable data recovery.
7 Ransomware Mitigation Strategies
#1: Endpoint Detection and Response (EDR)
Many ransomware attacks begin at the endpoint: a laptop, mobile device, unmonitored server. To defend against ransomware threats, businesses need Endpoint Detection and Response (EDR) solutions that monitor behaviours and respond to threats as they emerge.
Key capabilities to look for:
- Real-time detection of suspicious activity across all endpoints
- Automated response to isolate infected systems and contain the threat
- Forensic visibility to support investigation and compliance reporting
- Integration with SIEM platforms for broader incident correlation
EDR tools form the frontline of ransomware defence. They reduce dwell time (the period between infection and detection) and allow the security team to respond before critical data is compromised or systems are encrypted.
#2: Multi-Factor Authentication (MFA)
A successful phishing campaign or credential stuffing attempt can give attackers direct access to systems, including those holding critical data. Once inside, ransomware is often deployed silently, with encryption launched after access is secured.
MFA adds a second layer of protection across:
- Operating systems
- Email platforms
- Remote access tools
- Privileged user accounts
- Third-party integrations and cloud environments
MFA should be mandatory across your environment, not just for external access. Many ransomware infections spread internally once initial access is achieved. Limiting access using MFA can slow or prevent this movement, giving your security team time to intervene.
#3: Ransomware Backup Strategy
A backup system is only useful if it survives the attack. Too often, ransomware encrypts files and accessible backups, leaving organisations with no recovery path except to pay the ransom.
The backup strategy must be:
- Segregated: Backups should be stored off the primary network, ideally in a logically or physically isolated environment
- Immutable: Backups that cannot be altered or deleted by ransomware are essential
- Automated and regular: Backup systems must run on a defined schedule and be tested routinely
- Versioned: Maintaining multiple versions of data ensures restoration from a clean recovery point
Every backup strategy should include disaster recovery objectives that support both business continuity and compliance obligations. This includes clear data recovery timeframes, confirmation of recovery success, and documentation that aligns with audit requirements.
#4: Incident Response Planning
When ransomware strikes, response time directly affects impact. A well-documented, tested incident response plan can make the difference between isolated disruption and prolonged outage.
An incident response plan must address:
- Defined roles and responsibilities across your internal security team and third-party providers
- Clear escalation paths for technical, legal, and communications responses
- Recovery procedures for infected systems, including identification of safe restore points
- Legal and regulatory obligations, including breach notification requirements
- Simulation exercises to test readiness and identify any execution gaps
Simulation is especially important. Plans that look comprehensive on paper often reveal flaws in practice. Conducting tabletop or live-fire exercises gives your team practical experience and helps validate each control, from backup systems to endpoint isolation.
#5: Vulnerability and Patch Management
Unpatched systems remain one of the most common root causes of ransomware infection. Attackers rely on known exploits (often with patches available for months) to gain initial access.
Maintaining a real-time patching cadence helps close these entry points before they’re used.
This involves:
- Asset inventory to track all systems, applications, and devices
- Vulnerability scanning tools that identify weaknesses across your environment
- Automated patch deployment to reduce delays and human error
- Change control policies that ensure patches are tested before rollout
Particular attention should be paid to internet-facing systems and those running older or unsupported operating systems. These often represent the most significant security gaps in an otherwise modern infrastructure.
#6: Cyber Security Awareness Training
The most advanced security controls can still be bypassed by a single click. Phishing remains the leading method for initiating a ransomware infection, often using well-crafted emails to convince employees to open malicious links or attachments.
Awareness training needs to be:
- Frequent: Quarterly training sessions supported by short monthly refreshers
- Targeted: Different roles carry different risk levels and require tailored guidance
- Interactive: Simulated phishing campaigns test real-world responses and highlight weak points
- Measured: Track user performance to identify trends and prioritise remediation
Employees play a frontline role in ransomware defence. Investing in their awareness is part of maintaining a strong overall security posture.
#7: Network and Data Segmentation
When ransomware reaches internal systems, its ability to move laterally determines the scale of damage. Without segmentation, one compromised device can lead to the encryption of hundreds of servers and file shares.
Network and data segmentation controls include:
- Role-based access controls to limit who can view or modify critical data
- Isolated administrative environments to protect privileged credentials
- Segregated backup environments that cannot be accessed by production systems
- Firewall rules and VLANs that restrict traffic between departments or functions
This control doesn’t prevent a ransomware infection, it contains it. By limiting access, network segmentation slows the spread of malware, minimises the attack surface, and creates more time for your security team to respond.
Prevent Attacks with the Right Ransomware Defence Strategy
These seven controls work because they’re operational. They define what gets protected, how response happens, and who’s responsible at each stage. When properly implemented, they make ransomware attacks harder to launch, easier to detect, and faster to contain.
If your organisation handles regulated data and can’t afford prolonged downtime, these controls need to be actioned.
The cyber security team at Evolution Systems can review your current ransomware protection strategy. Get clarity on what’s working, what’s missing, and how to close the remaining gaps.
