MalwareHealthcareHealthcareRansomwareCapture Stored DataData ExfiltratedCustomer Data InvolvedPHIGovernment IDIdentity (basic)Health (basic)MediumContained

One Community Health

bd_263ec385e615791b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 20, 2021

Filed

Nov 22, 2021

To disclose

31 weeks

Affected

Not disclosed

Linked

7 filings

Confidence

65%

Full breach record for One Community Health →2 incidents on file

One Community Health experienced a ransomware cyber-attack between April 19 and April 20, 2021. Abnormal activity was detected on April 20, 2021. Investigation concluded on October 6, 2021, revealing that Social Security numbers, full names, dates of birth, addresses, insurance information, diagnosis information, and treatment information were removed from the network. The organization offered one year of complimentary credit monitoring via Experian IdentityWorks and implemented enhanced cybersecurity defenses including endpoint detection and managed detection and response.

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Leak gap clock⏱ Leak >30d31 weeks discovery → filing

Incident timeline

undetected · 1 days

discovery → filing · 31 weeks / 216 days

Apr 19, 2021

Begins

Apr 20, 2021

Discovered

Nov 22, 2021

Filed

vs. sector median

+18 wks slower

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitepysabd_bec32e8ec6b2f2d52021-09-13 · +70dVerified by operator

Regulatory filings (5) · sorted by filing gap

Massachusetts State AGbd_3160c106a12e74b62021-11-22Verified
Washington State AGbd_35ad13c84ba11aa92021-11-22Verified
Oregon State AGbd_649bee50f83e02db2021-11-22Verified
HHS OCRbd_7192441b0b10f5ef2021-11-22Verified

Show 1 more filing ↓

Montana State AGbd_e0a5b3d61a15dd392021-11-22Verified

Name: One Community Health
norm: one community health

Name: One Community Health
norm: one community health
Industry: Healthcarellm

Discovered: Apr 20, 2021
Breach occurred: Apr 19, 2021 – Apr 20, 2021
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PHIGovernment IDIdentity (basic)Health (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial

During the incident: Worked very closely with cybersecurity professionals to quickly isolate the affected systems and identify the nature of the attack
Offering a free, one-year membership to Experian IdentityWorksSM Credit 3B
Changes made: Partnered with cybersecurity experts to significantly increase our cybersecurity defenses
Implemented improved endpoint detection
Implemented 24x7 managed detection and response
Implemented email and attachment security enhancements
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 31 weeks(216 days from discovery to filing)
Compliance flags: Leak >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 5 states

View merged incident ↗

Massachusetts State AGNov 22 · first

Washington State AGNov 22 · first

Oregon State AGNov 22 · first

HHS OCRNov 22 · first

Montana State AGNov 22 · first

California State AGNov 22 · first · this page

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/sb24-547830
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 22, 2021
Raw hash: 12c05f7e0c00488ff0b58cd7117d7feb6031db3d54a84578344a525d885cf266

Linked disclosures

Ransomware claims (1)

Regulatory filings (5) · sorted by filing gap

Reporting entityOne Community Health

Victim entityOne Community Health

Incidentdiscovered Apr 20, 2021

Stated responseWorked very closely with cybersecurity professionals to quickly isolate the affected systems and identify the nature of the attack

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov