Major Taiwan Security Incidents: Case Analysis, Lessons, Protection Recommendations

Others' security incidents are your cheapest lessons.

Taiwan experiences numerous security incidents every year. Some make the news, many more don't.

This article compiles recent major Taiwan security incidents, analyzes causes, and provides protection recommendations.

Hopefully, your company won't appear here.

Taiwan Security Incident Overview

Let's look at the overall trends first.

Security Incident Statistics

Year	Reported Incidents	YoY Growth	Notes
2022	~800+ cases	-	-
2023	~1,000+ cases	25%+	-
2024	~1,200+ cases	20%+	3,993 avg weekly attacks
2025	Continuing to rise	-	CrazyHunter systematic attacks

According to Check Point Research data, Taiwan averaged 3,993 cyberattacks per week in 2024, ranking first in the Asia-Pacific region.

Taiwan's National Security Bureau revealed industries with the highest attack growth in 2024-2025:

• Telecommunications: Increased 6.5x
• Transportation: Increased 70%
• Defense supply chain: Increased 57%

This is just the reported numbers. Actual occurrences are higher.

Attack Type Distribution

Attack Type	Percentage (approx.)
Ransomware	30%
Data breach	25%
Website intrusion	20%
Phishing/Social engineering	15%
DDoS attacks	5%
Other	5%

Affected Industry Distribution

Industry	Victim Level
Government agencies	High (clear targets)
Manufacturing	High (ransomware favorite)
Financial services	Medium-high (better protection but high-value targets)
Healthcare	Medium-high (sensitive data)
Retail/E-commerce	Medium (customer data)
Education	Medium (weaker protection)

2024-2026 Major Security Incidents

Recent important cases.

2025 Major Events

CrazyHunter Ransomware Systematic Attacks on Hospitals (2025 Q1) 🔴

Taiwan's First Major "Special Category Data" Breach Storm

This is the most severe security incident of 2025. The China-based hacker group CrazyHunter launched systematic attacks on Taiwan medical institutions starting February 2025.

Victims (as of March 28, 2025):

Victim	Type	Impact
Mackay Memorial Hospital	Medical Center	Core medical order system, registration system down
Changhua Christian Hospital	Medical Center	Systems encrypted
Asia University Hospital	Hospital	Data breach
Keding Enterprises	Listed Company	Cybersecurity incident
Johnson Health Tech	Listed Company	Hacker attack
TECO Electric (suspected)	Listed Company	Under investigation

Attack Characteristics:

• Not just encrypting files for ransom, but stealing large amounts of sensitive data
• Patient medical records, surgery records, medical staff personal information published on dark web
• This is Taiwan's first large-scale breach involving "special category data" (medical data)

Lessons:

1. Healthcare has become a key target for nation-state hackers
2. Medical records are "special category personal data" with extremely serious breach consequences
3. Taiwan's Cybersecurity Agency has listed hospitals as 2025 priority for guidance
4. Enterprises need to assess whether they are being "systematically targeted"

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NoName057 DDoS Attack Wave (Early 2025)

Victims: Pro-Russian hacker group NoName057 launched third wave of DDoS attacks on Taiwan

Type	Affected Organizations
Listed Companies	Formosa Plastics, MiTAC
Government Agencies	Directorate-General of Budget, OTC
Transportation	20+ transportation-related websites
Local Government	Multiple county/city government websites

Lessons:

• Geopolitically-motivated attacks becoming more frequent
• Critical infrastructure needs enhanced DDoS protection
• Cross-department coordination mechanisms needed

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2025 Q1 Listed Company Security Incident Summary

Company	Incident Type	Description
ezTravel	Supply Chain Attack	Data theft
Shin Hai Gas	Ransomware	Server files encrypted
China Airlines	DDoS Attack	Official website attacked
Far Eastern New Century	Supply Chain Attack	IT vendor attack caused data breach concerns
Epistar (SAS Optronics)	Security Incident	Subsidiary announcement
DrayTek	DDoS Attack	Website services affected
Kuo Yang Construction	Ransomware	Encryption attack

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2024 Second Half Incidents

Major Tech Manufacturer Ransomware Attack (2024 Q3)

• Victim: Well-known Taiwan tech manufacturer
• Attack Type: Ransomware
• Impact: Some production lines stopped for several days
• Ransom Amount: Rumored over $70 million USD
• Result: Unconfirmed whether ransom was paid

Lessons:

• Manufacturing is a top ransomware target
• Downtime costs may exceed ransom
• Backup and recovery capability is key

Major Telecom Data Breach (2024 Q3)

• Victim: Major telecommunications company
• Breached Data: Millions of customer personal records
• Cause: Third-party vendor vulnerability
• Impact: Customers received scam calls/messages

Lessons:

• Supply chain security cannot be ignored
• Third-party risk management is important
• Fraud follows data breaches

Government Agencies Continuous Hacking (2024 Full Year)

• Victims: Multiple government agencies and state-owned enterprises
• Attack Source: Suspected foreign nation-state attacks
• Attack Type: APT (Advanced Persistent Threat)
• Target: Sensitive data, infrastructure

Lessons:

• Taiwan is a geopolitical target
• Government agencies face nation-state threats
• Cybersecurity is a national security issue

2024 First Half Incidents

Financial Holding Company Subsidiary Data Breach (2024 Q1)

• Victim: Financial services company
• Breached Data: Customer account information
• Cause: Internal personnel violation
• Impact: Customers suffered fraud losses

Lessons:

• Insider threats are real risks
• Access control and monitoring are important
• Least privilege principle

Regional Hospital Ransomware Attack (2024 Q2)

• Victim: Regional hospital
• Attack Type: Ransomware
• Impact: Systems paralyzed for several days, reverted to paper records
• Medical Records Impact: Some electronic records inaccessible

Lessons:

• Healthcare is a high-value target
• System downtime affects patient safety
• Backup mechanisms are important

2023 Major Incidents

Semiconductor Equipment Vendor Data Breach (2023)

• Victim: Semiconductor supply chain vendor
• Breached Data: Company secrets, customer data
• Attack Method: Suspected APT attack
• Impact: Trade secrets leaked

Airline Loyalty Program Data Breach (2023)

• Victim: National airline
• Breached Data: Tens of thousands of member personal records
• Impact: Members received scam messages

Car Sharing Service Data Breach (2023)

• Victim: Shared vehicle service
• Breached Data: ~400,000 member records
• Cause: API security vulnerability
• Impact: Personal data circulating on dark web

Lessons:

• API security is easily overlooked
• Leaked personal data is sold on dark web
• Early detection can reduce damage

Deep Analysis of Classic Cases

Let's analyze a few cases in depth.

Case 1: Manufacturing Ransomware Attack

Incident Sequence

A manufacturing company discovered at midnight that multiple servers were inaccessible. Upon login, files were encrypted and a ransom note appeared on desktops.

Attack Methods

1. Initial Intrusion: Phishing email

   • Employee received email appearing to be from supplier
   • Clicking attachment executed malware

2. Lateral Movement:

   • Gained initial host privileges
   • Used internal network weaknesses to move to other hosts
   • Eventually obtained AD administrator privileges

3. Encryption and Ransom:

   • Deployed ransomware to all accessible hosts
   • Simultaneously encrypted and exfiltrated data
   • Left ransom note

Why Did It Succeed?

Gap	Description
Insufficient email security	Malicious attachment not blocked
Insufficient endpoint protection	Malware not detected
Excessive privileges	Single account had too many permissions
Lack of isolation	No network segmentation
Incomplete backup	Backups also encrypted

Recommended Protections

• Advanced email security (sandbox detection)
• EDR endpoint detection and response
• Network segmentation
• Privileged account management
• Offline backup (3-2-1 backup principle)

Case 2: API Vulnerability Data Breach

Incident Sequence

A service's APP was found to have an API vulnerability where attackers could query other users' data arbitrarily.

Vulnerability Type

IDOR (Insecure Direct Object Reference)

# Normal request: Query own data
GET /api/user/12345

# Attack request: Change ID to query others' data
GET /api/user/12346
GET /api/user/12347
...

The API didn't verify whether the requester had permission to access the data.

Why Did It Happen?

Cause	Description
Development oversight	No permission validation
Insufficient testing	No security testing
Rushed launch	Features first, security later
Lack of review	No code review

Recommended Protections

• API permission validation (verify every request)
• Secure code review
• Penetration testing
• API security tools
• Rate limiting (prevent mass enumeration)

Case 3: Supply Chain Attack

Incident Sequence

A company discovered a data breach. Investigation revealed their own systems weren't hacked—their vendor was.

Attack Path

1. Attacker intrudes vendor's systems
2. Uses vendor's connection to access customer environment
3. Steals customer data
4. Customer completely unaware

Why Is It Hard to Defend?

• Vendor is a "trusted" connection
• Outside your monitoring scope
• You can't control vendor security

Recommended Protections

Measure	Description
Vendor assessment	Assess vendor's security capabilities
Least privilege	Vendor can only access necessary resources
Monitoring	Monitor vendor access behavior
Contract requirements	Include security clauses in contracts
Regular review	Regularly review vendor status

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Common Lessons from Security Incidents

Analyzing these incidents, what are the common points?

Lesson 1: Fundamentals Not Done

Common Gaps	Incident Percentage
Unpatched vulnerabilities	35%
Weak/default passwords	25%
Lack of MFA	20%
Insufficient email security	15%
Other	5%

Most incidents aren't from advanced attacks defeating you—it's fundamentals not being done.

Action Items

• Establish regular update mechanisms
• Implement password policies
• Enable MFA across the board
• Deploy email security

Lesson 2: Detection and Response Too Slow

Average time to discover intrusion: 200+ days.

Attackers have plenty of time to:

• Move laterally
• Find valuable data
• Establish persistent access
• Prepare final strike

Action Items

• Deploy detection tools (EDR, SIEM)
• Establish monitoring mechanisms
• Practice incident response
• Consider MDR services

Lesson 3: Backups Can't Save You

Backups are the last line of defense against ransomware, but many backups fail:

Failure Reason	Percentage
Backups also encrypted	40%
Backups too old	25%
Never tested restoration	20%
Incomplete backups	15%

Action Items

• 3-2-1 backup principle
• Offline backup (Air-gapped)
• Regular restoration testing
• Backup encryption

Lesson 4: People Are the Biggest Weakness

Human Factor	Percentage
Successful phishing/social engineering	35%
Internal personnel violations	15%
Configuration errors	25%
Other human errors	10%

85% of security incidents involve human factors.

Action Items

• Security awareness training
• Regular phishing exercises
• Build security culture
• Reduce human error opportunities

Lesson 5: Supply Chain Is a Blind Spot

Your security isn't just your business:

• Vendor hacked → You get hacked
• Open source package has vulnerability → You're affected
• Cloud service has problem → You're affected

Action Items

• Assess vendor security
• Limit vendor access permissions
• Monitor third-party access
• Have alternatives

Enterprise Protection Recommendations

Based on these cases, what should enterprises do?

Priority Items

If resources are limited, do these first:

Priority	Item	Benefit
1	MFA	Blocks 80%+ account attacks
2	Email security	Phishing is the biggest entry point
3	Backup verification	Last line against ransomware
4	Regular updates	Known vulnerabilities are main targets
5	Employee training	People are the biggest weakness

Phased Implementation

Phase 1 (Immediate)

Low cost, high effect measures:

• Enable MFA
• Update critical systems
• Strengthen password policies
• Confirm backups are usable

Phase 2 (Short-term)

Requires some investment:

• Deploy EDR
• Strengthen email security
• Security awareness training
• Establish incident response plan

Phase 3 (Medium-term)

Complete protection:

• Network segmentation
• SIEM deployment
• Regular penetration testing
• Red team exercises
• SOC build or outsource

Building Security Culture

Technology is only part of it. Culture is more important:

• Executive support: Security is a business issue, not just IT
• Everyone participates: Everyone has responsibility
• Continuous improvement: Security isn't a one-time project
• Learn from incidents: Learn from others' and your own incidents

How to Track Security News

Keep following security developments.

Taiwan Security Information Sources

Source	Type	URL
Administration for Cyber Security	Official	https://moda.gov.tw/ACS
TWCERT/CC	Reporting Center	https://www.twcert.org.tw
iThome Security	Media	https://www.ithome.com.tw/security
Information Security Magazine	Media	https://www.informationsecurity.com.tw
HITCON	Community	https://hitcon.org

International Security Information

Source	Type
CISA	US Official
Krebs on Security	Well-known blog
The Hacker News	News media
Dark Reading	Industry media

Tracking Recommendations

• Subscribe to RSS or newsletters
• Follow social media accounts
• Attend security conferences
• Join security communities

FAQ

Will small and medium businesses be attacked?

Yes. And increasingly so.

Reasons:

• SMBs usually have weaker protection
• Ransomware doesn't care about company size
• SMBs are part of supply chains

SMBs aren't "too small to attack"—they're "too small for anyone to know they were attacked."

Should breaches be made public?

Situations required by regulations must be disclosed (e.g., personal data breaches).

Other considerations:

• Disclosure may damage reputation
• But concealment risk is greater
• Transparent handling may actually build trust

Recommendation: Consult legal and PR experts.

Should you pay the ransom?

This is a difficult decision.

Reasons not to pay:

• Encourages crime
• No guarantee of data recovery
• May be attacked again

Some companies still pay:

• Downtime costs too high
• No backup
• Data too important

Recommendation: Prepare well in advance so you don't have to face this choice.

Is cybersecurity insurance useful?

Helpful, but not a cure-all.

Insurance can cover:

• Incident investigation costs
• Recovery costs
• Legal costs
• Some ransom payments

Insurance cannot:

• Prevent incidents from occurring
• Recover reputation damage
• Restore customer trust

Recommendation: Insurance is part of protection, not all of it.

Next Steps

Security incidents aren't a question of "if" but "when."

Recommended Actions

Immediate Actions

1. Check if your company has similar vulnerabilities
2. Confirm basic protection measures are in place
3. Verify backup availability
4. Create incident response plan

Ongoing Actions

1. Track security news
2. Regular security assessments
3. Employee security training
4. Update protection measures

Related Resources

Extended reading:

• Information Security Complete Guide: Security basics
• Security Incident Reporting Guide: What to do when incidents occur
• Cybersecurity Management Act Complete Guide: Regulatory requirements
• EDR vs MDR vs SOC: Protection solution selection

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