HackingHealthcareHealthcareStolen CredentialsCapture Stored DataData ExfiltratedCustomer Data InvolvedDelayed DiscoveryFinancial accountHealth (basic)Identity (basic)Government IDPHIHighActive

21st Century Oncology

bd_231b0f2f48d86b56 · schema v1 · pii pii-v1

Severity

High

Discovered

Nov 13, 2015

Filed

Mar 4, 2016

To disclose

16 weeks

Affected

2,802state residents only

Linked

8 filings

Confidence

70%

Full breach record for 21st Century Oncology →

21st Century Oncology notified the Washington AG that the FBI advised on Nov 13, 2015, that an unauthorized third party illegally obtained patient information from a database. Access likely occurred on Oct 3, 2015. Data included names, SSNs, diagnosis, treatment, and insurance info. 2,802 WA residents were notified. The FBI requested a notification delay. The incident is under active FBI investigation.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 41 days

discovery → filing · 16 weeks / 112 days

Oct 3, 2015

Begins

Nov 13, 2015

Discovered

Mar 4, 2016

Filed

vs. sector median

+5 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

California State AGbd_71143f2f3db9e0472016-03-04Verified
New Hampshire State AGbd_ed346a8482bd7a842016-03-04Verified
HHS OCRbd_fcbda5a17a2f0c7e2016-03-04Verified
Montana State AGbd_f97670eab77986b12016-03-14 · +10dVerified by operator

Show 3 more filings ↓up to 664d gap

Massachusetts State AGbd_8b2c60608960c1d32016-04-27 · +54dVerified
South Carolina State AGbd_527c87e1e91d5b942016-04-28 · +55dVerified
HHS OCR enforcementbd_d54ff290c72ee2482017-12-28 · +664dVerified 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: Mar 4, 2016
Affected individuals: 2,802state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Financial account
Data elements: Medical informationHealth insurance IDSocial Security numberName
WA-stated cause: Unauthorized Access
WA-stated duration: lifecycle Unknowndexposure Unknownd
WA-stated discovery: Found after the fact
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified the Federal Bureau of Investigation (FBI)Notified the Washington Attorney General
Initial access: valid_credentials

During the incident: Hired a leading forensics firm to support the investigation, assess systems and bolster security
Enhanced internal security protocols
Worked closely with the FBI on its investigation
Mailed letters to affected Washington residents
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: 16 weeks(112 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 ↗

California State AGMar 4 · first

New Hampshire State AGMar 4 · first

HHS OCRMar 4 · first

Washington State AGMar 4 · first · this page

Montana State AG+10d

Massachusetts State AG+54d

South Carolina State AG+55d

HHS OCR enforcement+664d

Pattern: first filing Mar 4 (CA), 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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM9611.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 4, 2016
Raw hash: ca64ef43df000a9bc8161d5e55818f2cfd72925114f6e16db5e43794784e00a0

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 the investigation, assess systems and bolster security

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com