HackingHealthcareHealthcareStolen CredentialsDelayed DiscoveryCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)Financial accountMediumContained

21st Century Oncology

bd_f97670eab77986b1 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 13, 2015

Filed

Mar 14, 2016

To disclose

17 weeks

Affected

264state residents only

Linked

8 filings

Confidence

66%

Full breach record for 21st Century Oncology →

21st Century Oncology notified patients of a data breach where an unauthorized third party accessed a database containing names, SSNs, and medical/insurance info. The FBI advised the company on Nov 13, 2015, though access likely occurred on Oct 3, 2015. Notifications were sent in April 2016 following an FBI delay request. Forensic investigators were engaged, and credit monitoring was offered.

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Incident timeline

undetected · 41 days

discovery → filing · 17 weeks / 122 days

Oct 3, 2015

Begins

Nov 13, 2015

Discovered

Mar 14, 2016

Filed

vs. sector median

+6 wks slower

This filing is one of 8 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Washington State AGbd_231b0f2f48d86b562016-03-04 · +10dVerified
California State AGbd_71143f2f3db9e0472016-03-04 · +10dVerified
New Hampshire State AGbd_ed346a8482bd7a842016-03-04 · +10dVerified
HHS OCRbd_fcbda5a17a2f0c7e2016-03-04 · +10dVerified

Show 3 more filings ↓up to 654d gap

Massachusetts State AGbd_8b2c60608960c1d32016-04-27 · +44dVerified
South Carolina State AGbd_527c87e1e91d5b942016-04-28 · +45dVerified
HHS OCR enforcementbd_d54ff290c72ee2482017-12-28 · +654dVerified by operator

Name: 21st Century Oncology
norm: 21st century oncology
Domain: 21co.com

Name: 21st Century Oncology
norm: 21st century oncology
Domain: 21co.com
Industry: Healthcarellm

Discovered: Nov 13, 2015
Breach occurred: Oct 3, 2015
Undetected for: 41 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 26, 2016
Affected individuals: 264state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Financial account
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified the Federal Bureau of Investigation (FBI)
Initial access: valid_credentials

During the incident: Hired a leading forensics firm to support our investigation, assess our systems and bolster security
Enhanced internal security protocols
Offering free one-year membership of Experian’s ProtectMyID Alert
Notified patients as quickly as possible
Changes made: Enhanced internal security protocols to help prevent a similar incident in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(122 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 7 states

View merged incident ↗

Washington State AGMar 4 · first

California State AGMar 4 · first

New Hampshire State AGMar 4 · first

HHS OCRMar 4 · first

Montana State AG+10d · this page

Massachusetts State AG+54d

South Carolina State AG+55d

HHS OCR enforcement+664d

Pattern: first filing Mar 4 (WA), last Dec 28 — a 664-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://dojmt.gov/wp-content/uploads/21st-Century-Oncology.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 14, 2016
Raw hash: 6a632ca12067ebfccf5954c2a4f4befc5dc5ec0ebeb6549681c5ddec6befd87d

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entity21st Century Oncology

Victim entity21st Century Oncology

Incidentdiscovered Nov 13, 2015

Stated responseHired a leading forensics firm to support our investigation, assess our systems and bolster security

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov