Jakarta Nanyang School Listed by tengu Ransomware Group: Ransomware Claim — What’s Alleged & What To Do
Jakarta Nanyang School was listed by the tengu ransomware group on January 26, 2026, after internal files were exfiltrated in a ransomware attack. Individuals associated with the school should check whether their data was exposed and follow any guidance issued by the institution.
Breaking down the breach
The only confirmed public information is the January 26, 2026 listing by tengu and the group’s assertion that internal files were taken. No data volume, file categories, or confirmation of encryption has been released by the school or investigators. The number of records or individuals involved remains unknown.
Who is tengu?
Tengu is a ransomware operator that has appeared on threat-intelligence reports since at least 2023. The group follows the common pattern of encrypting victim systems and posting file samples or directory listings on a dedicated leak site to pressure organisations into paying. Its listings are presented as claims by the group; independent verification of the underlying access or data volume is not provided in public reporting.
About Jakarta Nanyang School
Jakarta Nanyang School is a co-educational private institution in Bumi Serpong Damai, Indonesia, established in 2012. It serves students from age three through eighteen across kindergarten, primary, secondary and junior-college programmes and emphasises holistic development that includes academic, moral, physical, social and emotional growth. Schools of this type routinely collect and store personal information on current and former students, parents and staff.
The information in question
The listing refers only to “internal files exfiltrated in ransomware attack.” No inventory of specific data fields has been published. Educational institutions typically hold names, dates of birth, contact details, academic records, health information and financial data related to tuition. The precise contents of any exfiltrated material in this case have not been confirmed.
Why it matters
Personal records held by schools can be used for identity fraud, targeted scams or the creation of fraudulent accounts in a child’s name. For the institution, exposure of internal documents may reveal operational or financial details that affect families and staff. Because the number of affected individuals is undisclosed, the full scope of potential impact cannot yet be assessed.
If your data was in this claimed breach
Individuals connected to Jakarta Nanyang School should treat any school-related email addresses or accounts as potentially exposed and change passwords where reuse has occurred. Enable multi-factor authentication on accounts that hold personal or financial information. Monitor statements from the school for official guidance. Readers can run a free exposure scan of their email address against known breach data to check for prior appearances.
- Change passwords on school-linked accounts and enable multi-factor authentication.
- Review credit and bank statements for unusual activity.
- Watch for official notices from Jakarta Nanyang School.
AICompiled with AI assistance from public sources and published under our editorial standards.
How this breach connects
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Publicly posted by tengu — unverified claim, pending independent verification
Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated assessment, not a definitive rating. Verification status is shown where available.
Attributions to threat groups and methods reflect public reporting and, in some cases, unverified claims made by the groups themselves; they may be incomplete or later revised. Recent Breaches and GalaxyWarden are independent and are not affiliated with, and do not endorse, any company or group named on this page. This information is aggregated from public sources for awareness only and is not legal, security, or investment advice.