Cybersecurity

5 Ransomware Prevention Steps for South African Businesses

03 November 2025 · 0x1m3 · 6 min read

<div style="background: linear-gradient(135deg, #1B2A4A 0%, #2E5090 100%); padding: 48px 32px; border-radius: 8px; margin: 24px 0; position: relative; overflow: hidden;"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 200" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0.1;"> <polygon points="0,200 100,0 200,200" fill="white"/> <polygon points="150,200 250,0 350,200" fill="white"/> <polygon points="300,200 400,0 500,200" fill="white"/> <polygon points="50,100 100,0 150,100" fill="white"/> <polygon points="250,150 300,50 350,150" fill="white"/> </svg> <h2 style="color: #FFFFFF; margin: 0 0 12px 0; font-size: 28px; position: relative; z-index: 1;">Ransomware does not discriminate by company size.</h2> <p style="color: rgba(255,255,255,0.85); margin: 0; font-size: 16px; position: relative; z-index: 1;">South Africa is the most targeted country in Africa for ransomware attacks. These five steps will help your business stay off the victim list.</p> </div>

Ransomware prevention in South Africa is no longer optional. Interpol's Africa Cyber Threat Assessment identifies the country as the continent's primary target for ransomware and business email compromise. Attacks strike businesses of every size — from JSE-listed corporates to 20-person accounting firms.

The good news: ransomware is preventable. Not with a single product, but with a layered approach that covers protection, detection, and recovery. These five steps will get you there.

1. Deploy Endpoint Detection and Response (EDR)

Traditional antivirus is not enough. Ransomware variants mutate constantly, and fileless attacks bypass signature-based detection entirely. You need endpoint protection that watches behaviour, not just file signatures.

What to do: - Replace legacy antivirus with a behavioural AI-based EDR platform - Ensure autonomous response is enabled — threats must be contained in seconds, not hours - Cover every endpoint: desktops, laptops, servers, and cloud workloads

Why SentinelOne: SentinelOne's behavioural AI detects ransomware by what it does, not what it looks like. When ransomware starts encrypting files, SentinelOne kills the process, quarantines the threat, and rolls back encrypted files to their pre-attack state — automatically. No analyst required.

SentinelOne's patented ransomware rollback is the single most valuable feature in this entire list. It removes the ransom payment from the conversation.

OAS deploys SentinelOne as the Protect pillar of our Three Pillar Managed Security framework.

2. Implement Immutable, Off-Site Backups

If ransomware gets past your defences, your backup is your last line of recovery. But only if the backup itself has not been compromised.

Attackers know this. Modern ransomware actively targets backup systems — deleting shadow copies, encrypting backup files, and disabling backup services before triggering the main encryption payload.

What to do: - Use cloud-first backup with immutable storage that ransomware cannot modify or delete - Store backups off-site, outside your production network - Test restore procedures monthly — a backup you cannot restore is not a backup - Maintain at least 30 days of recovery points

Why Cove Data Protection: Cove stores encrypted backups in N-able's private cloud. These backups are immutable — once written, they cannot be altered or deleted by ransomware or compromised admin credentials. Restoration is fast and reliable.

OAS deploys Cove as the Recover pillar. When SentinelOne's rollback handles the immediate threat, Cove provides the safety net for full system recovery if needed. Two independent recovery paths.

3. Train Your People

Technology catches threats. People prevent them from arriving in the first place.

Phishing remains the primary delivery method for ransomware in South Africa. A single employee clicking a malicious link or opening an infected attachment is enough to compromise an entire network.

What to do: - Run quarterly phishing simulation exercises - Train all staff to verify unexpected email attachments and links — especially those requesting urgent action - Establish a clear reporting process for suspicious emails (make it easy, not punitive) - Include executive leadership in training — C-suite accounts are high-value phishing targets

No technology stack can compensate for an untrained workforce. Security awareness is a force multiplier for every other investment you make.

4. Automate Patch Management

Unpatched software is an open invitation. Ransomware operators routinely scan for known vulnerabilities in operating systems, VPN appliances, and business applications. When they find an unpatched system, they exploit it — often within days of a vulnerability being disclosed.

What to do: - Automate operating system and third-party application patching across all endpoints - Prioritise critical and high-severity patches within 72 hours of release - Monitor patch compliance across your entire fleet — one missed server is one open door - Include network devices and firmware in your patching schedule

Why N-able: N-able's Remote Monitoring and Management (RMM) platform automates patch deployment across Windows, macOS, and third-party applications. OAS monitors patch compliance from a single console and flags devices that fall behind.

OAS deploys N-able as the Detect pillar — providing the continuous monitoring and vulnerability management that prevents ransomware from finding a way in.

5. Build an Incident Response Plan

Prevention reduces risk. A response plan determines whether a successful attack costs your business hours or weeks.

Most South African businesses discover they need an incident response plan after an incident. By then, decisions are made under pressure, communication is chaotic, and recovery takes far longer than necessary.

What to do: - Document a ransomware-specific incident response plan with clear roles and responsibilities - Define communication protocols — who gets notified, in what order, and through which channels - Include POPIA breach notification procedures (72-hour reporting obligation to the Information Regulator) - Run a tabletop exercise at least annually to test the plan - Identify your external partners in advance — legal counsel, forensics, and your managed security provider

When OAS manages your security stack, incident response is built into the service. SentinelOne contains the threat autonomously. OAS provides root cause analysis and recovery coordination. You focus on business continuity while we handle the technical response.

<div style="background: linear-gradient(135deg, #1B2A4A 0%, #2E5090 100%); padding: 36px 32px; border-radius: 8px; margin: 32px 0; position: relative; overflow: hidden;"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 200" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0.1;"> <rect x="20" y="20" width="60" height="60" transform="rotate(15 50 50)" fill="white"/> <rect x="120" y="40" width="50" height="50" transform="rotate(30 145 65)" fill="white"/> <rect x="240" y="10" width="70" height="70" transform="rotate(10 275 45)" fill="white"/> <rect x="320" y="60" width="40" height="40" transform="rotate(25 340 80)" fill="white"/> </svg> <h3 style="color: #FFFFFF; margin: 0 0 12px 0; position: relative; z-index: 1;">The OAS Three Pillar Advantage</h3> <p style="color: rgba(255,255,255,0.85); margin: 0; font-size: 15px; position: relative; z-index: 1;">Notice something? These five steps map directly to our Protect, Detect, Recover methodology. SentinelOne protects your endpoints. N-able detects vulnerabilities and monitors compliance. Cove recovers your data. OAS manages it all. One framework covers every step on this list.</p> </div>

The Bottom Line

Ransomware prevention in South Africa comes down to five disciplines: protect endpoints with AI-driven EDR, back up data to immutable cloud storage, train your people, patch your systems, and plan your response before you need it.

OAS has been securing South African businesses for over 40 years. Our Three Pillar framework delivers all five steps as a single, managed service — so your team can focus on running the business, not fighting ransomware.

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Do not wait for a ransomware incident to expose the gaps. OAS's free security assessment evaluates your organisation against all five prevention steps and provides a clear roadmap to close any gaps.

Request Your Free Security Assessment →