HackingHealthcareFinancial ServicesHealthcareStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDPHIHealth (basic)Financial accountMinorMediumContained

M&T BANK CORPORATION

bd_ea36eff90c5e5ed7 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 30, 2020

Filed

Jul 10, 2020

To disclose

10 weeks

Affected

2state residents only

Linked

3 filings

Confidence

65%

Full breach record for M&T BANK CORPORATION →13 incidents on file

Sinai Hospital of Baltimore notified patients that M&T Bank, a vendor managing accounts receivable, experienced an incident where an unknown individual fraudulently obtained copies of patient documents between Dec 17, 2019 and Apr 30, 2020. Data included names, SSNs, health insurance info, and clinical details. Sinai offered credit monitoring.

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Incident timeline

undetected · 135 days

discovery → filing · 10 weeks / 71 days

Dec 17, 2019

Begins

Apr 30, 2020

Discovered

Jul 10, 2020

Filed

vs. sector median

2 wks faster

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

Massachusetts State AGbd_546621488bccc7422020-07-06 · +4dVerified
HHS OCRbd_59b62d24ea0673022020-06-29 · +11dVerified

Name: Sinai Hospital of Baltimore
norm: sinai hospital of baltimore
Domain: mtb.com

Name: M&T BANK CORPORATION
norm: m t bank
Domain: mtb.com
Industry: HealthcarellmFinancial Servicesllm

Discovered: Apr 30, 2020
Breach occurred: Dec 17, 2019 – Apr 30, 2020
Undetected for: 135 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDPHIHealth (basic)Financial accountMinor
Data elements: Social Security numberMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Implemented additional security precautions on the Sinai accounts
Began a comprehensive review of the documents the unauthorized individual had access to
Offering you a complimentary one-year membership of Experian’s IdentityWorks Credit 3B
Implemented additional security measures for account access
Provided additional training to account servicing personnel
Changes made: Implemented additional security measures for account access
Provided additional training to account servicing personnel
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(71 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 ↗

HHS OCRJun 29 · first

Massachusetts State AG+7d

Montana State AG+11d · this page

Pattern: first filing Jun 29 (NY), last Jul 10 (MT) — a 11-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/MT-Bank-Consumer-ltr.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 10, 2020
Raw hash: fa5ba5f72a22bd9449017cbc9ddaecb3b333731bab6b2dbec393104893115da6

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entitySinai Hospital of Baltimore

Victim entityM&T BANK CORPORATION

Incidentdiscovered Apr 30, 2020

Stated responseImplemented additional security precautions on the Sinai accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov