MalwareProfessional ServicesProfessional ServicesRansomwareData EncryptedData ExfiltratedCustomer Data InvolvedIdentity (basic)LowContained

Macmillan and its affiliates

bd_ee9c616b15df8f76 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 25, 2022

Filed

Dec 20, 2022

To disclose

25 weeks

Affected

Not disclosed

Linked

4 filings

Confidence

63%

Full breach record for Macmillan and its affiliates →

Macmillan and its affiliates experienced a ransomware incident between June 16 and June 25, 2022. On June 25, 2022, the company became aware of suspicious activity involving file encryption. An investigation confirmed that personal information, including names and email addresses, was accessed without authorization and exfiltrated from Macmillan U.S. systems. The company engaged third-party specialists, restored systems, notified federal law enforcement, and offered 24 months of credit monitoring to affected individuals.

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California clockDiscovered Jun 25, 2022 → Notified Dec 20, 2022178d ✗ CA 60-day late25 weeks discovery → filing

Incident timeline

undetected · 9 days

discovery → filing · 25 weeks / 178 days

Jun 16, 2022

Begins

Jun 25, 2022

Discovered

Dec 20, 2022

Filed

vs. sector median

+7 wks slower

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

California State AGbd_6d54a863f8a876a02022-12-01 · +19dCandidate
Indiana State AGbd_b5561471521b65862022-12-01 · +19dVerified
Massachusetts State AGbd_e810fdb276c8d4df2022-12-01 · +19dVerified

Name: Macmillan and its affiliates
norm: macmillan and its affiliates

Name: Macmillan and its affiliates
norm: macmillan and its affiliates
Industry: Professional Servicesllm

Discovered: Jun 25, 2022
Breach occurred: Jun 16, 2022 – Jun 25, 2022
Undetected for: 9 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 20, 2022
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: External
Regulator citations: Notified federal law enforcement

During the incident: Immediately addressed a network security incident
Launched an investigation with the assistance of third-party specialists
Restored functionality to the affected systems
Engaged the assistance of third-party specialists to conduct a thorough manual review of all information potentially impacted
Notified federal law enforcement of this incident
Changes made: Instituted additional safeguards
Reviewing existing policies and procedures regarding cybersecurity
Evaluating additional measures and safeguards to try to further protect against this type of incident in the future
Offered twenty-four (24) months of complimentary credit monitoring and identity restoration services provided through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 weeks(178 days from discovery to filing)
Compliance flags: CA 60-day late · 178d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Jun 25, 2022
→ Notified: Dec 20, 2022
178d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Jun 25, 2022 → Notified: Dec 20, 2022	178d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

California State AGDec 1 · first

Indiana State AGDec 1 · first

Massachusetts State AGDec 1 · first

California State AG+19d · this page

Pattern: first filing Dec 1 (CA), last Dec 20 (CA) — a 19-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/sb24-560263
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 20, 2022
Raw hash: 011e3b80dd03d62ccc5b98381a07e7c9a9844cea3ed41f8ca3a5d7c21caa218e

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMacmillan and its affiliates

Victim entityMacmillan and its affiliates

Incidentdiscovered Jun 25, 2022

Stated responseImmediately addressed a network security incident

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov