MalwareEducationEducationRansomwareData ExfiltratedData EncryptedSupply Chain (3P Vendor)Customer Data InvolvedGovernment IDIdentity (basic)MediumContained

Millbrook School

bd_36c204ef230469bb · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 16, 2020

Filed

Mar 23, 2021

To disclose

36 weeks

Affected

5state residents only

Linked

4 filings

Confidence

66%

Full breach record for Millbrook School →

Millbrook School notified the New Hampshire Attorney General of a cybersecurity incident involving its third-party vendor, Blackbaud, Inc. Blackbaud experienced a ransomware event in May 2020, which resulted in the exfiltration of unencrypted personal information, including names and Social Security numbers, of five New Hampshire residents. Millbrook notified affected individuals on March 22, 2021, and provided 24 months of credit monitoring services.

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Incident timeline

undetected · 76 days

discovery → filing · 36 weeks / 250 days

May 1, 2020

Begins

Jul 16, 2020

Discovered

Mar 23, 2021

Filed

vs. sector median

+27 wks slower

This filing is one of 4 about the same incident.View merged incident

Part of BLACKBAUD, INC. supply-chain incident (2020) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_4866dd6a89cc68052021-03-24 · +1dVerified
Indiana State AGbd_4debb556a0ac30012021-03-22 · +1dVerified
Maine State AGbd_df56e7d39b154f152021-03-22 · +1dCandidate

Name: Millbrook School
norm: millbrook school

Name: Millbrook School
norm: millbrook school
Industry: Educationllm

Discovered: Jul 16, 2020
Breach occurred: May 1, 2020
Undetected for: 76 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 22, 2021
Affected individuals: 5state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Filed Security Incident Notification with New Hampshire Attorney General pursuant to N.H. Rev. Stat. § 359-C:20
Third party: via Blackbaud, Inc.
Initial access: exploit_public_facing

During the incident: Notified potentially impacted five (5) New Hampshire residents by letter
Offered twenty-four (24) months of complimentary credit monitoring and identity theft services
Reviewed relationship with Blackbaud and technical controls in place for securing data
Changes made: Reviewing relationship with Blackbaud and technical controls in place for securing data
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 36 weeks(250 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGMar 22 · first

Maine State AGMar 22 · first

New Hampshire State AG+1d · this page

Massachusetts State AG+2d

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://mm.nh.gov/files/uploads/doj/remote-docs/millbrook-20210323.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 23, 2021
Raw hash: 029fb2f97cd6e702946cbb429366b13577842943689c714a32652cb36868485f

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMillbrook School

Victim entityMillbrook School

Incidentdiscovered Jul 16, 2020

Stated responseNotified potentially impacted five (5) New Hampshire residents by letter

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov