HackingHealthcareHealthcareStolen CredentialsCustomer Data InvolvedEmployee Data InvolvedPIIIdentity (basic)Government IDMediumContained

Prospect Medical Holdings, Inc.

bd_35efeda2e5a8d88f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 1, 2023

Filed

Sep 29, 2023

To disclose

8 weeks

Affected

73state residents only

Linked

13 records

Confidence

65%

Full breach record for Prospect Medical Holdings, Inc. →

Prospect Medical Holdings, Inc. notified the NH Attorney General of a data security incident. Unauthorized access occurred July 31-Aug 3, 2023. Discovered Aug 1, 2023. Employee and dependent PII (including SSNs) accessed. 73 NH residents affected. Notifications mailed Sept 29, 2023. Credit monitoring offered.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d8 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 1 days

discovery → filing · 8 weeks / 59 days

Jul 31, 2023

Begins

Aug 1, 2023

Discovered

Sep 29, 2023

Filed

vs. sector median

1 wks faster

This filing is one of 13 records about the same incident.View merged incident

A leak claim by rhysida about this victim was first seen 36 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Indiana State AGbd_01179efaed3e75352023-09-29Verified
HHS OCRbd_2fef4c679272ccd32023-09-29Verified
Maine State AGbd_6ef44d457fd8b2602023-09-29Verified
Vermont State AGbd_91573382e8c024192023-09-29Verified

Show 6 more filings ↓up to 154d gap

California State AGbd_bd24866d0fea52f92023-09-29Verified
Massachusetts State AGbd_c20d4bad3ff6d87f2023-09-29Verified
Montana State AGbd_f1bc0b4d5ad05a502023-09-29Verified
California State AGbd_e78b914f634463f72023-12-13 · +75dVerified
New Hampshire State AGbd_610b4d3b2e537df72024-02-29 · +153dVerified
Massachusetts State AGbd_e9100cb92bc339de2024-03-01 · +154dVerified

Showing first 10 of 12 linked disclosures.

Name: Prospect Medical Holdings, Inc.
norm: prospect medical
Domain: pmh.com

Name: Prospect Medical Holdings, Inc.
norm: prospect medical
Domain: pmh.com
Industry: Healthcarellm

Discovered: Aug 1, 2023
Breach occurred: Jul 31, 2023 – Aug 3, 2023
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Sep 29, 2023
Affected individuals: 73state-resident count only
Data types: PIIIdentity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Took steps to secure its systems
Contained the incident
Notified law enforcement
Engaged a third-party forensic firm to conduct an investigation
Mailed notification letters via United States Postal Service First-Class mail
Changes made: Offering individuals whose information may have been involved complimentary credit monitoring and identity protection services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(59 days from discovery to filing)
Compliance flags: Leak >30d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 7 states

View merged incident ↗

Indiana State AGSep 29 · first

HHS OCRSep 29 · first

Maine State AGSep 29 · first

Vermont State AGSep 29 · first

California State AGSep 29 · first

Massachusetts State AGSep 29 · first

Montana State AGSep 29 · first

New Hampshire State AGSep 29 · first · this page

California State AG+75d

New Hampshire State AG+153d

Massachusetts State AG+154d

Pattern: first filing Sep 29 (IN), last Mar 1 (MA) — a 154-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 12 — the full spread may be wider.

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://mm.nh.gov/files/uploads/doj/remote-docs/prospect-medical-holdings-20230929.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 29, 2023
Raw hash: ab356a49b26098f536cc6baa5f6969d6ba28e53901780e41af8131d8b42f4226

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityProspect Medical Holdings, Inc.

Victim entityProspect Medical Holdings, Inc.

Incidentdiscovered Aug 1, 2023

Stated responseTook steps to secure its systems

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov