Social EngineeringHealthcareHealthcarePhishingStolen CredentialsMulti-Stage ChainCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Health (basic)PHILowContained

University of Michigan/Michigan Medicine

bd_1b94129da0161dd1 · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 23, 2022

Filed

Nov 10, 2022

To disclose

11 weeks

Affected

8state residents only

Confidence

65%

Full breach record for University of Michigan/Michigan Medicine →11 incidents on file

Michigan Medicine notified Montana residents of a phishing incident (Aug 15-23, 2022) where employee credentials were compromised. Compromised email accounts contained patient PHI including names, DOBs, and medical records. No SSNs or financial data were involved. Accounts were disabled on Aug 23, 2022. Notices sent Oct 26, 2022.

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Incident timeline

undetected · 8 days

discovery → filing · 11 weeks / 79 days

Aug 15, 2022

Begins

Aug 23, 2022

Discovered

Nov 10, 2022

Filed

vs. sector median

on median

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed8 affectedView incident

Name: University of Michigan/Michigan Medicine
norm: university of michigan michigan medicine
Domain: med.umich.edu

Name: University of Michigan/Michigan Medicine
norm: university of michigan michigan medicine
Domain: med.umich.edu
Industry: Healthcarellm

Discovered: Aug 23, 2022
Breach occurred: Aug 15, 2022 – Aug 23, 2022
Undetected for: 8 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 26, 2022
Affected individuals: 8state-resident count only
Data types: Identity (basic)Health (basic)PHI
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Regulator citations: Reported incident to law enforcementNotifying the U.S. Department of Health and Human Services Office for Civil Rights
Initial access: phishing_link

During the incident: Disabled compromised accounts
Made password changes
Engaged a vendor to assist in the mailing of patient notice letters
Reviewed emails and attachments to determine if sensitive data was impacted
Reported incident to law enforcement
Notifying the U.S. Department of Health and Human Services Office for Civil Rights
Changes made: Assessing the ability to place additional technical safeguards on email system and infrastructure
Providing training and education materials to increase employee awareness
Sending regular, simulated phishing emails
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(79 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

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://dojmt.gov/wp-content/uploads/OCP/Consumer-Notification-Letter-704.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 10, 2022
Raw hash: 8d950d5b002c9590981e98f96161084b06ea6724cd9682d0a2f628e93294cf4f

Reporting entityUniversity of Michigan/Michigan Medicine

Victim entityUniversity of Michigan/Michigan Medicine

Incidentdiscovered Aug 23, 2022

Stated responseDisabled compromised accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov