For many years, cybersecurity looked like something only big companies needed to worry about. That is no longer true. Cybercriminals target small and medium-sized enterprises not because they are high profile, but because they are often easier to break into.
The numbers bear this out. In CSA’s Singapore Cybersecurity Health Report 2025, released in October 2026, almost nine in 10 Singapore organisations surveyed said they had encountered at least one cybersecurity incident in 2025. Yet 46% of businesses still saw themselves as unlikely targets.
This guide explains the most common cyber threats facing Singapore SMEs in 2026, in plain language, and what you can do about each one.
1. Ransomware
Ransomware locks your files and systems, then demands payment to unlock them. Many groups also steal data first and threaten to publish it. Ransomware was the most commonly reported incident in CSA’s 2025 health survey, and CSA’s Singapore Cyber Landscape 2025/2026 recorded 165 ransomware cases reported in 2025, up from 159 the year before. CSA notes that SMEs are disproportionately affected because of weaker cybersecurity maturity and limited resources.
How to protect yourself: endpoint security with EDR to stop ransomware early, and backups stored separately from your network so you can recover without paying. See the 3-2-1 backup rule and our guide on what to do after a ransomware attack.
2. Stolen Passwords and Compromised Accounts
Compromised credentials were the second most common incident type in CSA’s 2025 survey. Attackers get passwords through phishing pages, data leaks from other websites, or simply guessing weak passwords. Once they log in to email or Microsoft 365, they can read conversations, send emails as you and quietly set up forwarding rules.
How to protect yourself: turn on multi-factor authentication (MFA) for email, cloud apps, VPN and admin accounts, use unique passwords with a password manager, and remove accounts promptly when staff leave.
3. Phishing and Social Engineering
Phishing emails and messages trick staff into clicking a link, opening an attachment or handing over login details. CSA received about 4,800 reported phishing attempts in 2025. The number fell from 2024, but the messages are getting more convincing: attackers now use AI to write fluent, personalised emails with none of the old spelling mistakes.
How to protect yourself: email security filtering, staff awareness training, and a simple rule that anyone can report a suspicious message without blame.
4. Fake Invoices and Payment Fraud
A supplier emails to say their bank account has changed. A director urgently asks finance to make a transfer. These scams, often called business email compromise, are aimed squarely at SMEs because one successful payment can be worth tens of thousands of dollars. They often come from a real but hacked email account, so they look completely genuine.
How to protect yourself: always verify bank detail changes and urgent payment requests by phone using a number you already have, require two people to approve large payments, and protect email accounts with MFA.
5. Unpatched Systems and Automated Attacks
Cybercriminals no longer pick targets by hand. Automated tools scan the internet around the clock for weaknesses: outdated software, missing security updates, weak passwords and exposed remote access. If your system shows a weakness, the tool tries to break in, whether you have 5 staff or 500.
How to protect yourself: regular patch management for computers, servers and firewalls, a business-grade firewall, and never exposing remote desktop directly to the internet.
6. AI-Powered Scams and Deepfakes
CSA warns that threat actors are increasingly using AI to work faster and at larger scale, including voice clones, video deepfakes and tools designed to get around MFA. A phone call that sounds exactly like your director asking for an urgent transfer is no longer science fiction.
How to protect yourself: agree a verification step for any unusual payment or data request, however senior the person seems, and train staff that urgency is a warning sign.
7. Malware Hidden in Everyday Activity
Modern malware often hides inside normal-looking programs, runs only in memory, copies trusted system behaviour and spreads quietly over days or weeks. Traditional antivirus, which looks for known bad files, can miss it entirely. Infected computers can also be recruited into botnets; CSA detected around 284,300 instances of infected infrastructure in Singapore in 2025.
How to protect yourself: behaviour-based endpoint security with EDR, centrally monitored. See Antivirus vs Endpoint Security (EDR) for the difference, and consider managed detection and response (MDR) if you want experts watching your systems around the clock.
8. Accidental Data Leaks
Not every incident is an attack. Staff email the wrong customer list, share a OneDrive folder with “anyone with the link”, or lose an unencrypted laptop. Under the PDPA, these can still be data breaches that must be assessed and, in some cases, reported to the PDPC.
How to protect yourself: a Microsoft 365 security review of sharing settings, Data Loss Prevention rules for sensitive data, device encryption and basic PDPA training.
Threats at a Glance
| Threat | What it does | Key protection |
|---|---|---|
| Ransomware | Locks files and systems, may leak data | EDR and separate, tested backups |
| Stolen passwords | Attackers log in as your staff | MFA and unique passwords |
| Phishing | Tricks staff into clicking or sharing details | Email security and awareness training |
| Fake invoices | Diverts payments to criminals | Phone verification and dual approval |
| Unpatched systems | Automated tools break in through known weaknesses | Patch management and firewall |
| AI scams and deepfakes | Convincing fake voices, videos and emails | Verification steps for payments and requests |
| Hidden malware | Spreads quietly and evades antivirus | Behaviour-based EDR and monitoring |
| Accidental data leaks | Personal data shared or lost by mistake | M365 review, DLP and PDPA training |
Why SMEs Are Targeted
CSA’s 2025 survey found that 56% of businesses cited a lack of knowledge and experience as a challenge, and 37% cited insufficient manpower and resources. Attackers know this. Small teams are busy, there is often no dedicated IT security person, and one convincing message at the wrong moment is enough.
The point isn’t that people are careless. It’s that people are human and often under pressure, which is why the right protections need to be in place.
Where to Start
The good news is that the same handful of basics protect against most of these threats:
- Turn on MFA for email, cloud, VPN and admin accounts.
- Use strong, unique passwords and a password manager.
- Keep all devices, software and firewalls updated.
- Replace basic antivirus with behaviour-based endpoint security or EDR.
- Back up data automatically, store a copy separately and test restores.
- Train staff to spot phishing, fake invoices and urgent payment requests.
For the full checklist, see our Cybersecurity for Singapore SMEs: A Practical Starter Guide, which sets out the 16-point minimum security baseline for small companies.
If Something Goes Wrong
- Disconnect affected devices from the network and call your IT provider.
- Call the Cyber Incident Helpline on 6890 9555, launched in October 2026 by the Cyber Resilience Centre, for first-response advice and referrals.
- Report the incident to the police, which also notifies SingCERT.
- For ransomware, follow our step-by-step guide on what to do after a ransomware attack.
How Ostendo Helps
Ostendo helps Singapore SMEs protect against these threats with Acronis Endpoint Security, Acronis Backup, Microsoft 365 Backup and day-to-day IT support, including MFA, patching, email security, Microsoft 365 reviews and staff awareness.
Eligible SMEs can get up to 50% grant support for Acronis Endpoint Security, Acronis Backup and Microsoft 365 Backup. Read our EDGE grant guide for details.
Frequently Asked Questions
What is the biggest cyber threat to SMEs in Singapore?
Ransomware was the most commonly reported incident in CSA’s 2025 health survey, followed by compromised credentials and social engineering such as phishing and impersonation scams.
Are small businesses really targeted?
Yes. Almost nine in 10 organisations surveyed by CSA encountered at least one cybersecurity incident in 2025, and CSA notes SMEs are disproportionately affected by ransomware.
Is antivirus enough to protect my business?
Not on its own. Modern attacks often use stolen passwords or hide inside normal programs. Behaviour-based endpoint security with EDR, MFA and tested backups give much better protection.
How do I spot a fake invoice email?
Be suspicious of any change to bank details or urgent payment request, even from a known contact. Verify by phone using a number you already have, not one in the email.
Who can I call for help after a cyber incident in Singapore?
The Cyber Incident Helpline (6890 9555) gives first-response advice. You should also report incidents to the police, and to the PDPC if personal data is involved and the breach is notifiable.
Check Your Cyber Readiness
Want to know how exposed your business is? WhatsApp Ostendo on +65 9457 3538, or download our Cyber Resilience Checklist below. It takes less than five minutes and highlights areas you can improve straight away.
Checklist: Seven Essentials for Cyber Resilience and IT Optimization
In today’s fast-paced digital landscape, SMBs face unique challenges in managing their IT infrastructure.
This checklist is designed to help you score and identify where you stand regarding cyber resilience and what areas in your organization lack expertise, resources and experience regarding IT support, and partnering with an MSP like us, is crucial.
Fill out the form to download the checklist today!
