MalwareHealthcareHealthcareRansomwareData ExfiltratedData EncryptedRansom DemandedPIIIdentity (basic)LowContained

Highlands Oncology Group PA

bd_0a83c6ebc878fd09 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2023

Filed

Dec 29, 2023

To disclose

13 weeks

Affected

7state residents only

Linked

3 filings

Confidence

65%

Full breach record for Highlands Oncology Group PA →2 incidents on file

Highlands Oncology Group PA notified Montana residents of a cyber-attack discovered on September 26, 2023. An unauthorized third party accessed systems between Sept 25-26, encrypted files (ransomware), and potentially exfiltrated personal information including names. The company engaged forensic investigators, notified law enforcement, and offered one year of Experian IdentityWorks credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 1 days

discovery → filing · 13 weeks / 94 days

Sep 25, 2023

Begins

Sep 26, 2023

Discovered

Dec 29, 2023

Filed

vs. sector median

+1 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

HHS OCRbd_a1130dfe4f5478012023-12-22 · +7dVerified
Illinois State AGbd_54d50cfdf6a9b4832023-01-01 · +362dCandidate

Name: Highlands Oncology Group PA
norm: highlands oncology

Name: Highlands Oncology Group PA
norm: highlands oncology
Industry: Healthcarellm

Discovered: Sep 26, 2023
Breach occurred: Sep 25, 2023 – Sep 26, 2023
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 7state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: notified law enforcement

During the incident: Began an investigation
Notified law enforcement
Worked to secure our systems
Engaged a forensic security firm to assist with our investigation and confirm the security of our computer systems
Offering a complimentary one-year membership of Experian IdentityWorks SM Credit 3B
Changes made: Enhancing our technical security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(94 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Illinois State AGJan 1 · first

HHS OCR+355d

Montana State AG+362d · this page

Pattern: first filing Jan 1 (IL), last Dec 29 (MT) — a 362-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/OCP/Consumer-notification-letter-992.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 29, 2023
Raw hash: bd704e776da53c7c419cf9e7816b5b9ccf9588727cb0993a1ed0fb11c986566b

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityHighlands Oncology Group PA

Victim entityHighlands Oncology Group PA

Incidentdiscovered Sep 26, 2023

Stated responseBegan an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov