Social EngineeringEducationEducationPhishingTargetedPIIHealth (basic)LowContained

The Loomis Chaffee School

bd_a6382d32faf09e21 · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 25, 2024

Filed

Feb 18, 2025

To disclose

17 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for The Loomis Chaffee School →

The Loomis Chaffee School notified affected individuals of a phishing incident where unauthorized parties accessed certain email accounts between Oct 10-27, 2024. The attackers accessed emails containing names and medical information. The school engaged forensic investigators and secured accounts. No specific count of affected individuals was provided.

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Maryland clock✗ MD AG >90d17 weeks discovery → filing

Incident timeline

undetected · 15 days

discovery → filing · 17 weeks / 116 days

Oct 10, 2024

Begins

Oct 25, 2024

Discovered

Feb 18, 2025

Filed

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

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

New Hampshire State AGbd_c92f880e531b025c2025-02-18Verified

Name: The Loomis Chaffee School
norm: the loomis chaffee school

Name: The Loomis Chaffee School
norm: the loomis chaffee school
Industry: Educationllm

Discovered: Oct 25, 2024
Breach occurred: Oct 10, 2024 – Oct 27, 2024
Undetected for: 15 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 18, 2025
Affected individuals: Not disclosed
Data types: PIIHealth (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: External
Regulator citations: Notified Maryland Attorney General
Initial access: phishing_link

During the incident: Took steps to secure the email account
Launched an investigation with the assistance of a third-party forensic investigation firm
Changes made: Implemented additional safeguards and technical security measures to further protect and monitor its systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(116 days from discovery to filing)
Compliance flags: MD AG >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

New Hampshire State AGFeb 18 · first

Maryland State AGFeb 18 · 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.maryland.gov/resources-info/SBN%20Documents/2025/ITU-376368.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 18, 2025
Raw hash: 1bc75f8d77a52108bde294344a1697668cd8d31e024961a8f6426f7d0d838d15

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityThe Loomis Chaffee School

Victim entityThe Loomis Chaffee School

Incidentdiscovered Oct 25, 2024

Stated responseTook steps to secure the email account

ComplianceMD AG >90d

Extraction provenanceno artifact recorded

Source provenanceoag.maryland.gov