HackingFinancial ServicesFinanceVulnerability ExploitStolen CredentialsSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedTargetedIdentity (basic)Government IDFinancial accountMediumContained

Western Alliance Bank

bd_1ff1a0aa9cf88a3e · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 27, 2025

Filed

Mar 14, 2025

To disclose

7 weeks

Affected

11state residents only

Linked

12 records

Confidence

65%

Full breach record for Western Alliance Bank →

Western Alliance Bank notified the Maryland AG of a data security incident affecting 11 Maryland residents. A threat actor exploited an unknown vulnerability in a third-party secure file transfer software between Oct 12-24, 2024, to access files containing names, SSNs, DOBs, financial account numbers, driver's licenses, and passports. WAB engaged forensic investigators, notified law enforcement, and is offering credit monitoring.

J jump to incidentP pin to compareR raw source

Maryland clock⏱ MD AG >30d7 weeks discovery → filing

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
Montana State AGbd_31bf2692dfc20e2e2025-03-14Verified
Massachusetts State AGbd_50441007ebdd801d2025-03-14Verified

Show 6 more filings ↓up to 109d gap

Maine State AGbd_72b6c4555f8350882025-03-14Verified
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: Polsinelli (on behalf of Western Alliance Bank)
norm: polsinelli on behalf of western alliance bank

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

Discovered: Jan 27, 2025
Breach occurred: Oct 12, 2024 – Oct 24, 2024
Undetected for: 107 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 14, 2025
Affected individuals: 11state-resident count only
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: Notified Maryland Office of the Attorney General
Initial access: exploit_public_facing

During the incident: Engaged a forensic security firm, through counsel, to assist with WAB’s investigation of the incident
Notified law enforcement of this incident
Notifying involved individuals via first-class United States mail
Offering complimentary credit monitoring services
Changes made: Enhancing its 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: MD AG >30dLeak >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

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

Montana State AGMar 14 · first

Massachusetts State AGMar 14 · first

Maine State AGMar 14 · first

New Hampshire State AGMar 14 · first

Maryland 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://oag.maryland.gov/resources-info/SBN%20Documents/2025/ITU-376555.pdf
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: 1a95f6bc493adc6d9885d12fe25c0acb0a53d6907132ff13be71f801d7acd5e7

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityPolsinelli (on behalf of Western Alliance Bank)

Victim entityWestern Alliance Bank

Incidentdiscovered Jan 27, 2025

Stated responseEngaged a forensic security firm, through counsel, to assist with WAB’s investigation of the incident

ComplianceMD AG >30d

Extraction provenanceno artifact recorded

Source provenanceoag.maryland.gov