Social EngineeringHealthcareHealthcarePhishingStolen CredentialsDelayed DiscoveryCustomer Data InvolvedSupply Chain (3P Vendor)PHIHealth (basic)Identity (basic)LowContained

Memorial Radiation Oncology Medical Group

bd_43d7251d7c4d362d · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 13, 2025

Filed

Jul 15, 2025

To disclose

5 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for Memorial Radiation Oncology Medical Group →

Memorial Radiation Oncology Medical Group disclosed an email phishing incident involving a former third-party vendor. Unauthorized parties accessed patient email and SharePoint accounts between December 13-16, 2024. The organization learned of the incident on June 13, 2025. Affected data includes names and other patient information. The company is providing credit monitoring and additional cybersecurity training.

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Incident timeline

undetected · 182 days

discovery → filing · 5 weeks / 32 days

Dec 13, 2024

Begins

Jun 13, 2025

Discovered

Jul 15, 2025

Filed

vs. sector median

8 wks faster

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

Name: Memorial Radiation Oncology Medical Group
norm: memorial radiation oncology medical

Name: Memorial Radiation Oncology Medical Group
norm: memorial radiation oncology medical
Industry: Healthcarellm

Discovered: Jun 13, 2025
Breach occurred: Dec 13, 2024 – Dec 16, 2024
Undetected for: 182 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PHIHealth (basic)Identity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: External
Third party: via former third-party vendor
Initial access: phishing_link

During the incident: Measures were taken immediately in response
A thorough investigation was conducted to determine what occurred
A review was performed of the emails, attachments, and SharePoint files that may have been accessed
Changes made: Additional cybersecurity training is being provided to staff
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(32 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://oag.ca.gov/ecrime/databreach/reports/sb24-605497
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 15, 2025
Raw hash: b8bc086d157141d0739aa11fa06cca2aeaabfccdf9dc6a8b28d0352007bebc10

Reporting entityMemorial Radiation Oncology Medical Group

Victim entityMemorial Radiation Oncology Medical Group

Incidentdiscovered Jun 13, 2025

Stated responseMeasures were taken immediately in response

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov