HackingHealthcareHealthcareStolen CredentialsCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)Government IDPHIHealth (basic)MediumContained

ATC Healthcare Services, LLC

bd_b8409d1a39d9d96a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 22, 2021

Filed

Jul 1, 2022

To disclose

27 weeks

Affected

Not disclosed

Linked

5 filings

Confidence

65%

Full breach record for ATC Healthcare Services, LLC →

ATC Healthcare Services, LLC notified the California Attorney General of unauthorized access to employee email accounts occurring between February 9, 2021, and December 22, 2021. The incident was discovered on December 22, 2021. The investigation confirmed unauthorized access but could not rule out access to data within the accounts. Affected individuals may have had personal information, potentially including PHI and PII, exposed. ATC secured accounts, implemented additional security measures, and offered credit monitoring.

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California clockDiscovered Dec 22, 2021 → Notified Jun 2, 2022162d ✗ CA 60-day late27 weeks discovery → filing

Incident timeline

undetected · 316 days

discovery → filing · 27 weeks / 191 days

Feb 9, 2021

Begins

Dec 22, 2021

Discovered

Jul 1, 2022

Filed

vs. sector median

+15 wks slower

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Maine State AGbd_3f0d1a519ddac57d2022-07-01Candidate
Montana State AGbd_668c33a2e141b2df2022-07-01Verified
Indiana State AGbd_6923c1933acb879e2022-07-01Verified
Massachusetts State AGbd_8052894aef0454712022-07-01Verified

Name: ATC Healthcare Services, LLC
norm: atc healthcare

Name: ATC Healthcare Services, LLC
norm: atc healthcare
Industry: Healthcarellm

Discovered: Dec 22, 2021
Breach occurred: Feb 9, 2021 – Dec 22, 2021
Undetected for: 316 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 2, 2022
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)Government IDPHIHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: External

During the incident: Took steps to secure the email accounts
Initiated an investigation to determine the nature and scope of the event
Conducted a diligent review to identify what information was present in the impacted email accounts
Implemented additional technical security measures designed to mitigate recurrence of this type of incident
Reviewing and enhancing existing data privacy policies and procedures
Offering access to credit monitoring and identity theft protection services through Epiq at no cost
Changes made: Implemented additional technical security measures designed to mitigate recurrence of this type of incident
Reviewing and enhancing existing data privacy policies and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 27 weeks(191 days from discovery to filing)
Compliance flags: CA 60-day late · 162d
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: Dec 22, 2021
→ Notified: Jun 2, 2022
162d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Dec 22, 2021 → Notified: Jun 2, 2022	162d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Maine State AGJul 1 · first

Montana State AGJul 1 · first

Indiana State AGJul 1 · first

Massachusetts State AGJul 1 · first

California State AGJul 1 · 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/sb24-554865
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 1, 2022
Raw hash: e5a107ed04366c56009f2b6497368f51e1274584918790d1635b965f4a961159

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityATC Healthcare Services, LLC

Victim entityATC Healthcare Services, LLC

Incidentdiscovered Dec 22, 2021

Stated responseTook steps to secure the email accounts

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov