Diamond Electric Holdings announced that its Thai subsidiary suffered unauthorized access on September 8, 2025, resulting in local servers and several personal computers being encrypted by ransomware [1]. The company isolated external and intra-group network connections, disabled affected devices, and engaged a local cybersecurity firm to investigate the scope of impact [1]. The announcement stated that no impact on the parent company or other group companies had been confirmed at the time and that potential data exposure remained under investigation [1].
Backfill: this event became public on Sep 26, 2025 and we added it on Nov 10, 2026. It is not a new event.
HighMonitoringBackfillOfficially confirmed
Diamond Electric Discloses Ransomware Encryption at Thai Subsidiary
1 min read
- Disclosed
- Sep 26, 2025
- Occurred
- Sep 8, 2025
- Published
- Nov 10, 2026
- Last updated
- Nov 7, 2026
- CVSS basis
- Our assessment
- Attack vector
- Impact
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Manufacturing
What to do nowOur advice
The announcement stated that no impact on the parent company or other group companies had been confirmed at the time and that potential data exposure remained under investigation [1].
Timeline
- Incident publicly disclosed[1]
Technical details
Source-Supported Details
The announcement stated that no impact on the parent company or other group companies had been confirmed at the time and that potential data exposure remained under investigation [1].
Source excerpt: "(JST) on Monday, September 8, 2025, Thai Diamond & Zebra Electric’s network system was subject to unauthorized access by a third party. It was confirmed that local servers and some personal computers were infected with and their data had been encrypted." [1].
References
Official / primary1
- [1]
“(JST) on Monday, September 8, 2025, Thai Diamond & Zebra Electric’s network system was subject to unauthorized access by a third party. It was confirmed that local servers and some personal computers were infected with ransomware and their data had been encrypted.”
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