HackingHealthcareEducationHealthcareVulnerability ExploitData ExfiltratedCustomer Data InvolvedPIIIdentity (basic)Government IDMediumContained

THE MEDICAL COLLEGE OF WISCONSIN, INC.

bd_07df4c9699a28e03 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 21, 2023

Filed

Nov 14, 2023

To disclose

8 weeks

Affected

27state residents only

Linked

5 filings

Confidence

66%

Full breach record for THE MEDICAL COLLEGE OF WISCONSIN, INC. →7 incidents on file

Medical College of Wisconsin notified affected individuals of a third-party data incident involving the MOVEit Transfer solution. Unauthorized actors exploited a vulnerability in MOVEit to access data stored on MCW's server on May 27, 2023. MCW discovered the incident on September 21, 2023. Personal information, potentially including SSNs and government IDs, was removed. MCW engaged third-party investigators and offered credit monitoring services.

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Incident timeline

undetected · 117 days

discovery → filing · 8 weeks / 54 days

May 27, 2023

Begins

Sep 21, 2023

Discovered

Nov 14, 2023

Filed

vs. sector median

2 wks faster

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

Part of Progress Software Corporation supply-chain incident (2023) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

HHS OCRbd_753d8a044dea7d712023-11-14Candidate
Vermont State AGbd_de0fa02547aa70ce2023-11-14Candidate
Massachusetts State AGbd_e2241480b3dee3962023-11-14Verified
New Hampshire State AGbd_297e007c221295502023-11-20 · +6dVerified

Name: THE MEDICAL COLLEGE OF WISCONSIN, INC.
norm: the medical college of wisconsin

Name: THE MEDICAL COLLEGE OF WISCONSIN, INC.
norm: the medical college of wisconsin
Industry: HealthcarellmEducationllm

Discovered: Sep 21, 2023
Breach occurred: May 27, 2023
Undetected for: 117 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 14, 2023
Affected individuals: 27state-resident count only
Data types: PIIIdentity (basic)Government ID
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: exploit_public_facing

During the incident: Engaged third-party professionals to assist in the investigation and remediation of the vulnerability
Offering a complimentary membership of Experian IdentityWorks
Set up a dedicated and confidential toll-free response line
Changes made: Review of ongoing third-party vendor relationships
Continually evaluate and modify practices and internal controls to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(54 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 ↗

HHS OCRNov 14 · first

Vermont State AGNov 14 · first

Massachusetts State AGNov 14 · first

Montana State AGNov 14 · first · this page

New Hampshire State AG+6d

Pattern: first filing Nov 14 (WI), last Nov 20 (NH) — a 6-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-841.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 14, 2023
Raw hash: 832ed5b50958908b9228bbc30d8377bd2cc2aeffbb26277a8607efdd18a6943b

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityTHE MEDICAL COLLEGE OF WISCONSIN, INC.

Victim entityTHE MEDICAL COLLEGE OF WISCONSIN, INC.

Incidentdiscovered Sep 21, 2023

Stated responseEngaged third-party professionals to assist in the investigation and remediation of the vulnerability

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov