HackingFinancial ServicesFinanceVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountHighContained

Western Alliance Bank

bd_72b6c4555f835088 · schema v1 · pii pii-v1

Severity

High

Discovered

Jan 27, 2025

Filed

Mar 14, 2025

To disclose

7 weeks

Affected · nationwide

21,8996 in this filing

Linked

12 records

Confidence

65%

Full breach record for Western Alliance Bank →

Western Alliance Bank reported a third-party vendor software breach occurring Oct 12-24, 2024, discovered Jan 27, 2025. Unauthorized actors exploited an unknown vulnerability in secure file transfer software to exfiltrate files containing names, SSNs, and financial data. 21,899 individuals affected; 6 in Maine. Law enforcement notified; credit monitoring offered.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >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 · 107 days

discovery → filing · 7 weeks / 46 days

Oct 12, 2024

Begins

Jan 27, 2025

Discovered

Mar 14, 2025

Filed

vs. sector median

2 wks faster

This filing is one of 12 records about the same incident.View merged incident

A leak claim by cl0p about this victim was first seen 49 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

California State AGbd_06380a907e1b2dce2025-03-14Candidate
Nebraska State AGbd_1664f06702ed95452025-03-14Verified
Maryland State AGbd_1ff1a0aa9cf88a3e2025-03-14Verified
Montana State AGbd_31bf2692dfc20e2e2025-03-14Verified

Show 6 more filings ↓up to 109d gap

Massachusetts State AGbd_50441007ebdd801d2025-03-14Verified
New Hampshire State AGbd_c53d68dc954452b42025-03-14Verified
Washington State AGbd_1e2bedd75bd91a032025-06-30 · +108dVerified
Oregon State AGbd_aa0c3c3710d657002025-06-30 · +108dVerified
New Hampshire State AGbd_ca35ca5f0299f3142025-06-30 · +108dVerified
Texas State AGbd_f8043b0f67779b8f2025-07-01 · +109dVerified

Showing first 10 of 11 linked disclosures.

Name: Western Alliance Bank
norm: western alliance bank
Domain: westernalliancebank.com

Name: Western Alliance Bank
norm: western alliance bank
Domain: westernalliancebank.com
Industry: Financial Servicesllm

Discovered: Jan 27, 2025
Scope identified: Feb 21, 2025Maine’s notice clock starts here (10 M.R.S. §1348(1))The letter says: “On February 21, 2025, we determined that the files contained some of your personal information, including your name and Social Security number.”
Breach occurred: Oct 12, 2024 – Oct 24, 2024
Undetected for: 107 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 14, 2025
Affected individuals: 21,899state + nationwide
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Filed notification with Maine Attorney General
Initial access: supply_chain

During the incident: Notified law enforcement
Offering a complimentary one-year membership of Experian IdentityWorks Credit 3B
Changes made: Enhancing technical security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(46 days from discovery to filing)
Compliance flags: Leak >30dME AG ≤30d · 21d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Scope identified: Feb 21, 2025
→ Filed with AG: Mar 14, 2025
21d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Scope identified: Feb 21, 2025 → Filed with AG: Mar 14, 2025	21d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

California State AGMar 14 · first

Nebraska State AGMar 14 · first

Maryland State AGMar 14 · first

Montana State AGMar 14 · first

Massachusetts State AGMar 14 · first

New Hampshire State AGMar 14 · first

Maine State AGMar 14 · first · this page

Washington State AG+108d

Oregon State AG+108d

New Hampshire State AG+108d

Texas State AG+109d

Pattern: first filing Mar 14 (CA), last Jul 1 (TX) — a 109-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 11 — 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/655a94de-d6a8-4736-a67c-abd1cba4ebaa.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 14, 2025
Raw hash: 9404e9c130b8ce05d60547c690d13b47f15711e7aaa9073635b96dde91d9f610

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityWestern Alliance Bank

Victim entityWestern Alliance Bank

Incidentdiscovered Jan 27, 2025

Stated responseNotified law enforcement

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov