Social EngineeringEducationEducationPhishingStolen CredentialsCustomer Data InvolvedEmployee Data InvolvedMulti-Stage ChainPIIIdentity (basic)LowContained

Loomis Chaffee School

bd_c92f880e531b025c · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 25, 2024

Filed

Feb 18, 2025

To disclose

17 weeks

Affected

3state residents only

Confidence

65%

Loomis Chaffee School reported a phishing incident where unauthorized parties accessed employee email accounts between Oct 10-27, 2024. The school detected the incident on Oct 25, 2024, secured accounts, and engaged forensic investigators. Notification letters were mailed on Feb 18, 2025, to 3 NH residents, offering credit monitoring. PII was accessed via email.

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Incident timeline

undetected · 15 days

discovery → filing · 17 weeks / 116 days

Oct 10, 2024

Begins

Oct 25, 2024

Discovered

Jan 10, 2025

Scope determined

Feb 18, 2025

Filed

vs. sector median

+8 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed3 affectedView incident

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

Name: Loomis Chaffee School
norm: loomis chaffee
Domain: loomis.us
Industry: Educationllm

Discovered: Oct 25, 2024
Breach occurred: Oct 10, 2024 – Oct 27, 2024
Undetected for: 15 daysoccurrence → discovery
Materiality determined: Jan 10, 2025
Notification sent: Feb 18, 2025
Affected individuals: 3state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General
Initial access: phishing_link

During the incident: Took steps to secure the email accounts
Launched an investigation with the assistance of a third-party forensic investigation firm
Mailed notification letters to individuals whose information was involved
Offering individuals whose information were involved complimentary credit monitoring and identity protection services
Changes made: Implemented, and will continue to adopt, additional safeguards and technical security measures to further protect and monitor our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(116 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/loomis-chaffee-school-20250218.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: 450a3ce4b145ee0fd7fd89bb5bb1907974ca35e5c408debcd338071be45b946f

Reporting entityThe Loomis Chaffee School

Victim entityLoomis Chaffee School

Incidentdiscovered Oct 25, 2024

Stated responseTook steps to secure the email accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov