MalwareRansomwareData ExfiltratedData EncryptedIDENTITY_BASICLowContained
Mastery Charter High School
bd_ac760a429f740ea3 · schema v1 · pii pii-v1
Full breach record for Mastery Charter High School →Mastery Charter High School experienced a cybersecurity incident in September 2024 involving malicious encryption attributed to an unauthorized actor. The incident resulted in data exfiltration and affected personal information including names. The school shut down systems, engaged cybersecurity professionals, reported to federal law enforcement, and offered credit monitoring to affected individuals.
Vermont clock✗ VT AG >45 bday38 weeks discovery → filing
⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
This filing is one of 4 about the same incident.View merged incident
Linked disclosures
Why this link?Regulatory filings (3) · sorted by filing gap
- bd_557cf3225408f29aIndiana State AGfiled 2025-06-06Verified
- bd_d445c07723535b6bMaine State AGfiled 2025-06-06Candidate
- bd_e77dfb9a7798647dNew Hampshire State AGfiled 2025-06-12(6d gap)Verified
Source provenance
- Source URL
- https://ago.vermont.gov/document/2025-06-06-mastery-charter-high-school-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- Jun 6, 2025
- Raw hash
- d0fcc0bb28d724482687353a9be2391eec3019cee8363267ea022396b2b735d6
Reporting entity
- Name
- Mastery Charter High Schoolnorm: mastery charter high school
Victim entity
- Name
- Mastery Charter High Schoolnorm: mastery charter high school
Incident
- Discovered
- Sep 15, 2024
- Materiality determined
- —
- Notification sent
- Jun 6, 2025
- Affected individuals
- Not disclosed
- Data types
- IDENTITY_BASIC
- Attack vector
- Ransomware
- MITRE ATT&CK
- T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
- Threat actor
- ExternalFinancial
- Regulator citations
- reporting the matter to federal law enforcementreporting this Incident to relevant government agencies
Compliance
- Time to disclose
- 38 weeks(264 days from discovery to filing)
- Compliance flags
- VT AG >45 bday
- Discovery-date grounding
- unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.