Ransomware Guide for Korean SMEs: Prevention, Response, and Recovery (2026)
Korea recorded 56 ransomware attacks in 2025 — the highest ever — with 93% of victims being SMEs. Learn about the KISIA free protection program, the 3-2-1 backup rule, and how to respond.
Ransomware Guide for Korean SMEs: Prevention, Response, and Recovery
South Korea recorded 56 ransomware attacks in 2025 — the highest number in five years. 93% of victims were small and medium enterprises. While large corporations have dedicated security teams, SMEs are easy targets due to limited resources.
Key Stats (2025)
| Metric | Number |
|---|---|
| Annual attacks | 56 (5-year high) |
| SME victims | 93% |
| Average downtime | 16 days |
| Recovery rate after payment | ~65% |
Attack Vectors
| Vector | Share |
|---|---|
| Email attachments | 35% |
| Remote Desktop (RDP) | 25% |
| Software vulnerabilities | 20% |
| Supply chain | 10% |
| Other (USB, websites) | 10% |
Prevention: 3-2-1 Backup Rule
- 3 copies of your data
- 2 different storage types (NAS + external drive)
- 1 offline copy (air-gapped from network)
Security Basics Checklist
- Update all software to latest versions
- Disable RDP or move behind VPN
- Strengthen admin passwords (12+ characters)
- Enable multi-factor authentication (MFA)
- Train employees on phishing recognition
- Install antivirus with real-time monitoring
KISIA Free Protection Program
KISA provides free security services to 41 SMEs: vulnerability assessments, ransomware response solutions, and security training. Apply at boho.or.kr.
During an Attack
Never Do This
| Don't | Why |
|---|---|
| Pay the ransom | No guarantee; makes you a repeat target |
| Keep working on infected PC | Spreads encryption |
| Delete encrypted files | Blocks future decryption |
Immediate Actions
- Disconnect from network — unplug LAN, disable Wi-Fi
- Report to KISA 118
- Preserve evidence — screenshot ransom notes
- Verify offline backups
- Contact security professionals
Recovery: No More Ransom
nomoreransom.org offers free decryption tools. Use "Crypto Sheriff" to identify your ransomware type. Never delete encrypted files — a decryptor may become available later.
Sharing Backup Credentials Safely
SMEs need to share backup admin passwords among team members. Sending via iMessage or email risks exposure.
Use LOCK.PUB to create password-protected links:
- Write backup credentials as a secure memo
- Set access password + expiration time
- Share the link with authorized personnel
- Send the password via phone call
Auto-deletes after expiration — no sensitive data left in chat history.
Summary
| Phase | Key Actions |
|---|---|
| Prevention | 3-2-1 backup, updates, MFA, KISIA |
| During attack | Disconnect, KISA 118, never pay |
| Recovery | nomoreransom.org, restore from backup |
| Credentials | LOCK.PUB for safe sharing |
Prevention is the best defense. Never pay the ransom.
Keywords
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