Ransomware Prevention Checklist for Thai Businesses 2026

Ransomware remains one of the most damaging threats to Thai organizations because it can halt operations within hours. Use these seven controls to check how ready your organization is before an incident happens.

1. Back up the right way

Follow the 3-2-1 rule: three copies, on two types of media, with one copy offline or immutable so ransomware cannot encrypt it. Test a real restore at least quarterly — a backup you cannot restore is not a backup.

2. Cover every device with EDR

Traditional antivirus may not be enough. Deploy EDR on every endpoint and server to spot abnormal behavior such as mass file encryption and isolate infected machines immediately. Check regularly for devices missing the agent or running outdated versions.

3. Harden accounts and identity

Enforce MFA on email, VPN and every admin account, separate admin accounts from daily-use accounts, and never reuse passwords. Attackers more often log in with stolen credentials than exploit a vulnerability.

4. Patch fast and close internet-facing exposure

Prioritize patches for actively exploited vulnerabilities, especially VPNs, mail servers and anything exposed to the internet. Never leave RDP directly reachable; allow access only through a VPN or ZTNA.

5. Protect email and train staff

Phishing is still the most common entry point. Use email and web filtering, restrict Office macros, and run regular training with simulated phishing so staff know exactly who to report suspicious messages to.

6. Segment the network and limit privileges

Separate critical systems such as file servers and databases from user networks, and grant only the access each role needs. This limits the damage if a single machine is compromised.

7. Prepare and rehearse your response plan

Document an incident response plan with owners, contact channels, criteria for isolating systems and who must be notified. Rehearse it at least once a year and keep contact details for an external response team ready in advance.

How Seqrite can help

Seqrite Endpoint Protection, EDR and XDR help prevent and detect ransomware behavior on endpoints and across layers, backed by a local team in Thailand that can assess, deploy and tune policies for your organization. Contact our sales team for a consultation or demo.