HackingFinancial ServicesFinanceStolen CredentialsSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountHighContained

MidFirst Bank

bd_4cdab9b39b8d0719 · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 13, 2023

Filed

Aug 4, 2023

To disclose

7 weeks

Affected

6,097state residents only

Linked

5 filings

Confidence

71%

Full breach record for MidFirst Bank →2 incidents on file

MidFirst Bank notified Washington AG of a third-party data breach involving the MOVEit file transfer platform. Unauthorized access occurred May 27-31, 2023, affecting customer names, SSNs, and account numbers. 6,097 Washington residents were notified. The bank offered 24 months of identity monitoring via OnAlert.

J jump to incidentP pin to compareR raw source

Washington clock⏱ WA AG >30d7 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 · 17 days

discovery → filing · 7 weeks / 52 days

May 27, 2023

Begins

Jun 13, 2023

Discovered

Aug 4, 2023

Filed

vs. sector median

1 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Montana State AGbd_3f83236ccf1420dd2023-08-21 · +17dVerified
Massachusetts State AGbd_5eec0209f5842ab82023-08-21 · +17dVerified
Oregon State AGbd_63b23748175961ff2023-08-21 · +17dVerified
California State AGbd_e933a0e5fa8c3b692023-08-21 · +17dVerified

Name: MidFirst Bank
norm: midfirst bank
Domain: midfirst.com

Name: MidFirst Bank
norm: midfirst bank
Domain: midfirst.com
Industry: Financial Servicesllm

Discovered: Jun 13, 2023
Breach occurred: May 27, 2023 – May 31, 2023
Undetected for: 17 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 4, 2023
Affected individuals: 6,097state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: NameSocial Security numberFinancial account numberDate of birth
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found after the fact
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: supply_chain

During the incident: Offering a complimentary, 24-month membership to OnAlertTM (Essential Bundle) from ChexSystems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(52 days from discovery to filing)
Compliance flags: WA AG >30d
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.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Washington State AGAug 4 · first · this page

Montana State AG+17d

Massachusetts State AG+17d

Oregon State AG+17d

California State AG+17d

Pattern: first filing Aug 4 (WA), last Aug 21 (CA) — a 17-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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA26105.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 4, 2023
Raw hash: 4838483c080c9af9ef4fa1e9b19179654e523fd438831264b264d67c87a7835c

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityMidFirst Bank

Victim entityMidFirst Bank

Incidentdiscovered Jun 13, 2023

Stated responseOffering a complimentary, 24-month membership to OnAlertTM (Essential Bundle) from ChexSystems

ComplianceWA AG >30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com