HackingFinancial ServicesFinanceCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDFinancial accountHighContained

Santander Holdings U.S.A.

bd_404a6d12d7472512 · schema v1 · pii pii-v1

Severity

High

Discovered

May 10, 2024

Filed

Jun 18, 2024

To disclose

6 weeks

Affected · nationwide

12,78612 in this filing

Linked

5 filings

Confidence

66%

Full breach record for Santander Holdings U.S.A. →

Santander Holdings U.S.A., Inc. reported an external system breach (hacking) affecting 12,786 individuals, including 12 Maine residents. The incident occurred between April 17 and May 9, 2024, and was discovered on May 10, 2024. Compromised data included names, Social Security numbers, and bank account information. Santander blocked access to the system and offered 24 months of credit monitoring through Experian.

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Maine clockDiscovered May 10, 2024 → Filed with AG Jun 18, 202439d ⏱ ME AG >30d6 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 · 23 days

discovery → filing · 6 weeks / 39 days

Apr 17, 2024

Begins

May 10, 2024

Discovered

Jun 18, 2024

Filed

vs. sector median

3 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

Indiana State AGbd_395d62da97223f3d2024-06-18Verified
Vermont State AGbd_cdbe61780213854b2024-06-18Verified
Massachusetts State AGbd_f4d4e89167278c552024-06-18Verified
New Hampshire State AGbd_e1f35afb20d667a22024-07-03 · +15dVerified

Name: Santander Holdings U.S.A.
norm: santander holdings usa

Name: Santander Holdings U.S.A.
norm: santander holdings usa
Industry: Financial Servicesllm

Discovered: May 10, 2024
Breach occurred: Apr 17, 2024 – May 9, 2024
Undetected for: 23 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 18, 2024
Affected individuals: 12,786state + nationwide
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: exploit_public_facing

During the incident: Blocked access to the affected system
Took preventative actions to further safeguard systems
Offered 24 months of identity protection and credit monitoring services through Experian
Changes made: Took preventative actions to further safeguard systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(39 days from discovery to filing)
Compliance flags: ME AG >30d · 39d
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
Discovered: May 10, 2024
→ Filed with AG: Jun 18, 2024
39d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 10, 2024 → Filed with AG: Jun 18, 2024	39d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Indiana State AGJun 18 · first

Vermont State AGJun 18 · first

Massachusetts State AGJun 18 · first

Maine State AGJun 18 · first · this page

New Hampshire State AG+15d

Pattern: first filing Jun 18 (IN), last Jul 3 (NH) — a 15-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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/64c7c259-76f1-4ad5-b4cc-aa49e0421716.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 18, 2024
Raw hash: 4c273a23597842ca1b2739b5116278357cba36ce24c00e836da31535bfa6d166

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entitySantander Holdings U.S.A.

Victim entitySantander Holdings U.S.A.

Incidentdiscovered May 10, 2024

Stated responseBlocked access to the affected system

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov