HackingFinancial ServicesFinanceData ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)HighContained

The Mather Group LLC

bd_c8317ee81c4eba6b · schema v1 · pii pii-v1

Severity

High

Discovered

Aug 10, 2023

Filed

Sep 14, 2023

To disclose

5 weeks

Affected · nationwide

3,5212 in this filing

Linked

6 filings

Confidence

66%

Full breach record for The Mather Group LLC →

The Mather Group LLC, a financial services entity based in Chicago, experienced an external system breach (hacking) on June 21, 2023. The incident compromised the names and Social Security Numbers of 3,521 individuals, including 2 Maine residents. The breach was discovered on August 10, 2023, and written notifications were sent to affected individuals on September 14, 2023, along with 12 months of credit and identity protection services.

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Maine clockDiscovered Aug 10, 2023 → Filed with AG Sep 14, 202335d ⏱ ME AG >30d5 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 · 50 days

discovery → filing · 5 weeks / 35 days

Jun 21, 2023

Begins

Aug 10, 2023

Discovered

Sep 14, 2023

Filed

vs. sector median

3 wks faster

This filing is one of 6 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (5) · sorted by filing gap

Massachusetts State AGbd_16a721f3980fd9502023-09-14Verified
Vermont State AGbd_2a7169609785dc402023-09-14Verified
New Hampshire State AGbd_36da1fe1362248262023-09-14Verified
Montana State AGbd_3fb0edde155368132023-09-14Candidate

Show 1 more filing ↓

Indiana State AGbd_9798f80942aa90de2023-09-14Verified

Name: The Mather Group LLC
norm: the mather

Name: The Mather Group LLC
norm: the mather
Industry: Financial Servicesllm

Discovered: Aug 10, 2023
Breach occurred: Jun 21, 2023
Undetected for: 50 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 14, 2023
Affected individuals: 3,521state + nationwide
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Filed data breach notice with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Sent written notification to affected individuals
Offered 12 months of IDX credit and identity protection service
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(35 days from discovery to filing)
Compliance flags: ME AG >30d · 35d
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 10, 2023
→ Filed with AG: Sep 14, 2023
35d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 10, 2023 → Filed with AG: Sep 14, 2023	35d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 6 filings · 6 states

View merged incident ↗

Massachusetts State AGSep 14 · first

Vermont State AGSep 14 · first

New Hampshire State AGSep 14 · first

Montana State AGSep 14 · first

Indiana State AGSep 14 · first

Maine State AGSep 14 · first · this page

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-a1252b4f8318/21adf4e9-1860-4752-91f4-7e8a206e90bb.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 14, 2023
Raw hash: a00707f0b27652d45ad675200ce4f3af01745b10b729cd65a355e9801c46a3b2

Linked disclosures

Regulatory filings (5) · sorted by filing gap

Reporting entityThe Mather Group LLC

Victim entityThe Mather Group LLC

Incidentdiscovered Aug 10, 2023

Stated responseSent written notification to affected individuals

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov