Social EngineeringHealthcareTechnologyHealthcarePhishingStolen CredentialsCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)CredentialsLowContained

ATC Healthcare Services, LLC

bd_668c33a2e141b2df · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 22, 2021

Filed

Jul 1, 2022

To disclose

27 weeks

Affected

3state residents only

Linked

5 filings

Confidence

65%

Full breach record for ATC Healthcare Services, LLC →

ATC Healthcare Services, LLC notified Montana residents of unauthorized access to employee email accounts between Feb 9 and Dec 22, 2021. Discovered Dec 22, 2021. Access likely via phishing. PII and credentials exposed. Remediation included password resets, security enhancements, and credit monitoring offers.

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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
Indiana State AGbd_6923c1933acb879e2022-07-01Verified
Massachusetts State AGbd_8052894aef0454712022-07-01Verified
California State AGbd_b8409d1a39d9d96a2022-07-01Verified

Name: ATC Healthcare Services, LLC
norm: atc healthcare

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

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: 3state-resident count only
Data types: PIIIdentity (basic)Credentials
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Secured the accounts, including password changes
Conducted a diligent investigation to confirm the full nature and scope of the event
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: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Maine State AGJul 1 · first

Indiana State AGJul 1 · first

Massachusetts State AGJul 1 · first

California State AGJul 1 · first

Montana 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://dojmt.gov/wp-content/uploads/OCP/Consumer-Notification-Letter-369.pdf
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: 28e30ed359a7ee5fdf008f0b59ba1dc19eeadb652beb9c2fa0a826bc2cc7d356

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityATC Healthcare Services, LLC

Victim entityATC Healthcare Services, LLC

Incidentdiscovered Dec 22, 2021

Stated responseSecured the accounts, including password changes

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov