Social EngineeringHealthcareHealthcarePhishingData ExfiltratedCustomer Data InvolvedIdentity (basic)Health (basic)PHILowContained

OncoHealth

bd_a93374cf8bda9c23 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 4, 2025

Filed

Nov 20, 2025

To disclose

11 weeks

Affected · nationwide

391 in this filing

Confidence

66%

Full breach record for OncoHealth →

OncoHealth, Inc. reported a phishing incident on August 26, 2025, discovered September 4, 2025, affecting 39 individuals (1 in Maine). A fraudulent Zendesk account was added to an email distribution, inadvertently exposing PHI (names, DOB, Humana ID) to an impersonator. OncoHealth deactivated the account and enhanced security controls.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Sep 4, 2025 → Filed with AG Nov 20, 202577d ⏱ ME AG >30d11 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 9 days

discovery → filing · 11 weeks / 77 days

Aug 26, 2025

Begins

Sep 4, 2025

Discovered

Nov 20, 2025

Filed

vs. sector median

2 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed39 affectedView incident

Name: OncoHealth
norm: oncohealth
Domain: oncohealth.us
Industry: Healthcare

Name: OncoHealth
norm: oncohealth
Domain: oncohealth.us
Industry: Healthcare
Industry: Healthcarellm

Discovered: Sep 4, 2025
Breach occurred: Aug 26, 2025
Undetected for: 9 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 10, 2025
Affected individuals: 39state + nationwide
Data types: Identity (basic)Health (basic)PHI
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified Maine Attorney General
Initial access: phishing_link

During the incident: Enhanced internal controls
Increased security awareness
Updated Zendesk system protections and training materials
Deactivated fraudulent Zendesk account
Changes made: Enhanced internal controls
Increased security awareness
Updated Zendesk system protections and training materials
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(77 days from discovery to filing)
Compliance flags: ME AG >30d · 77d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Sep 4, 2025
→ Filed with AG: Nov 20, 2025
77d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Sep 4, 2025 → Filed with AG: Nov 20, 2025	77d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/f3a84649-3311-4d5e-bf11-529654b9e719.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 20, 2025
Raw hash: ac807c648f4f8fc9e952eb60b641547c0ca62eaad248b27077f66b317f482f1d

Reporting entityOncoHealth

Victim entityOncoHealth

Incidentdiscovered Sep 4, 2025

Stated responseEnhanced internal controls

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov