Social EngineeringEducationEducationPhishingStolen CredentialsData ExfiltratedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDFinancial accountFinancial credentialsPHIHealth (basic)CredentialsAuthenticationMediumContained

Mater Dei High School

bd_d18112056efc29be · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 31, 2021

Filed

Aug 30, 2021

To disclose

30 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for Mater Dei High School →

Mater Dei High School experienced a cybersecurity incident where employee email accounts were compromised via phishing. Unauthorized access occurred from Jan 1 to Mar 4, 2021. Exposed data included PII, SSNs, financial info, and PHI. The school engaged forensic investigators, reset passwords, and offered identity monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 30 days

discovery → filing · 30 weeks / 211 days

Jan 1, 2021

Begins

Jan 31, 2021

Discovered

Aug 30, 2021

Filed

vs. sector median

+22 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Indiana State AGbd_ea61890c6013154c2021-08-30Verified

Name: Mater Dei High School
norm: mater dei high school

Name: Mater Dei High School
norm: mater dei high school
Industry: Educationllm

Discovered: Jan 31, 2021
Breach occurred: Jan 1, 2021 – Mar 4, 2021
Undetected for: 30 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial accountFinancial credentialsPHIHealth (basic)CredentialsAuthentication
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email CollectionT1041 Exfiltration Over C2 Channel
Threat actor: External
Initial access: phishing_link

During the incident: Engaged cyber counsel and a specialized cybersecurity firm to conduct a forensic investigation
Changed all email passwords
Improved computer security settings
Implemented new policies to reduce the storage of sensitive personal information within email systems
Providing 12 months of complimentary identity monitoring services through Kroll
Changes made: Improved computer security settings
Implemented new policies to reduce the storage of sensitive personal information within email systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 30 weeks(211 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Indiana State AGAug 30 · first

California State AGAug 30 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-544417
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 30, 2021
Raw hash: 788af35542e791a390dca7f851bc8c5b1868c4151ec46bea9533f40f18b3a07d

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMater Dei High School

Victim entityMater Dei High School

Incidentdiscovered Jan 31, 2021

Stated responseEngaged cyber counsel and a specialized cybersecurity firm to conduct a forensic investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov