HackingFinancial ServicesFinanceVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDHighContained

Northfield Bank

bd_79fd0089944d1124 · schema v1 · pii pii-v1

Severity

High

Discovered

Aug 8, 2023

Filed

Sep 7, 2023

To disclose

4 weeks

Affected · nationwide

4,1121 in this filing

Linked

7 filings

Confidence

65%

Full breach record for Northfield Bank →

Northfield Bank reported a data breach affecting 4,112 individuals due to a security event involving the MOVEit Transfer application at a third-party vendor. The breach occurred between May 27, 2023, and May 31, 2023, and was discovered on August 8, 2023. The compromised information includes names and Social Security numbers. The bank offered affected individuals two years of credit monitoring and identity restoration services.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Aug 8, 2023 → Filed with AG Sep 7, 202330d ✓ ME AG ≤30d4 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 · 73 days

discovery → filing · 4 weeks / 30 days

May 27, 2023

Begins

Aug 8, 2023

Discovered

Sep 7, 2023

Filed

vs. sector median

5 wks faster

This filing is one of 7 about the same incident.View merged incident

Part of Progress Software Corporation supply-chain incident (2023) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Massachusetts State AGbd_05cc028fdb8910792023-09-08 · +1dVerified
New Hampshire State AGbd_9963040c41fa49262023-09-08 · +1dVerified
Vermont State AGbd_e04b124b7a8d579e2023-09-08 · +1dCandidate
Indiana State AGbd_2d7bc11eba226abc2023-09-25 · +18dVerified

Show 2 more filings ↓up to 25d gap

Vermont State AGbd_d86ff387ddb8a86a2023-09-25 · +18dVerified
New Hampshire State AGbd_d9885b4724d481062023-10-02 · +25dVerified

Name: Northfield Bank
norm: northfield bank

Name: Northfield Bank
norm: northfield bank
Industry: Financial Servicesllm

Discovered: Aug 8, 2023
Breach occurred: May 27, 2023 – May 31, 2023
Undetected for: 73 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 7, 2023
Affected individuals: 4,112state + nationwide
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1195 Supply Chain Compromise
Threat actor: External
Initial access: exploit_public_facing

During the incident: Offered two years of Credit Monitoring and Identity Restoration Services through Kroll.
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(30 days from discovery to filing)
Compliance flags: ME AG ≤30d · 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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Aug 8, 2023
→ Filed with AG: Sep 7, 2023
30d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 8, 2023 → Filed with AG: Sep 7, 2023	30d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 5 states

View merged incident ↗

Maine State AGSep 7 · first · this page

Massachusetts State AG+1d

New Hampshire State AG+1d

Vermont State AG+1d

Indiana State AG+18d

Vermont State AG+18d

New Hampshire State AG+25d

Pattern: first filing Sep 7 (ME), last Oct 2 (NH) — a 25-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/fec08671-932c-4f98-8ff0-a12647dc8ac2.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 7, 2023
Raw hash: 5f540014a3ce75ee8b06b4c57491d366590f0611518071025d89fd42a253db7c

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityNorthfield Bank

Victim entityNorthfield Bank

Incidentdiscovered Aug 8, 2023

Stated responseOffered two years of Credit Monitoring and Identity Restoration Services through Kroll.

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov