HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedTargetedPIIIdentity (basic)MediumContained

THOMPSON COBURN LLP

bd_b40d210e2b06d256 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 29, 2024

Filed

May 1, 2025

To disclose

48 weeks

Affected

4,149state residents only

Linked

13 filings

Confidence

65%

Full breach record for THOMPSON COBURN LLP →2 incidents on file

Thompson Coburn, LLP notified individuals of a cybersecurity incident where unauthorized actors accessed files containing names and other personal information between May 28-29, 2024. The firm engaged forensic specialists, reviewed affected files, and offered credit monitoring services. The incident is contained.

J jump to incidentP pin to compareR raw source

South Carolina clock✓ SC CRA notice due48 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 1 days

discovery → filing · 48 weeks / 337 days

May 28, 2024

Begins

May 29, 2024

Discovered

May 1, 2025

Filed

vs. sector median

+29 wks slower

This filing is one of 13 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Illinois State AGbd_bca3feb9282b2ecd2025-05-01Verified by operator
Montana State AGbd_32b01e9f0204bad62025-04-30 · +1dVerified
Indiana State AGbd_4e74aaeebe6a09542025-04-30 · +1dVerified
Maine State AGbd_701bdfa64bf675ab2025-04-30 · +1dVerified

Show 6 more filings ↓up to 121d gap

Vermont State AGbd_7de9090db5f14f602025-04-30 · +1dVerified
California State AGbd_bc01038a5aee99bd2025-04-30 · +1dVerified
Nebraska State AGbd_c638e59ef9811f162025-04-30 · +1dVerified
New Hampshire State AGbd_f2a4f37f8236c7522025-04-30 · +1dVerified
New Hampshire State AGbd_0f38d2bde5ce25bd2024-12-31 · +121dVerified
Massachusetts State AGbd_5b550fa881215a692024-12-31 · +121dVerified

Showing first 10 of 12 linked disclosures.

Name: THOMPSON COBURN LLP
norm: thompson coburn
Domain: thompsoncoburn.com

Name: THOMPSON COBURN LLP
norm: thompson coburn
Domain: thompsoncoburn.com
Industry: Professional Servicesllm

Discovered: May 29, 2024
Breach occurred: May 28, 2024 – May 29, 2024
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 4,149state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External

During the incident: Launched an investigation into the nature and scope of the activity with the assistance of third-party forensic specialists
Undertook a comprehensive review of the affected files
Offering you immediate access to credit monitoring and identity theft protection services for <<CM Duration>> months at no cost to you, through Equifax
Changes made: Reviewing existing security policies
Implemented additional cybersecurity measures to further protect against similar events moving forward
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 48 weeks(337 days from discovery to filing)
Compliance flags: SC CRA notice due
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

New Hampshire State AGDec 31 · first

Massachusetts State AGDec 31 · first

Montana State AG+120d

Indiana State AG+120d

Maine State AG+120d

Vermont State AG+120d

California State AG+120d

Nebraska State AG+120d

New Hampshire State AG+120d

Illinois State AG+121d

South Carolina State AG+121d · this page

Pattern: first filing Dec 31 (NH), last May 1 (SC) — a 121-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 12 — 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://consumer.sc.gov/sites/consumer/files/Documents/Security%20Breach%20Notices/2025/ThompsonCoburnLLP.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 1, 2025
Raw hash: c248c17d0c4fed7531546fb3cf41909227ce4ee15388312a0c29b14739ed490f

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityTHOMPSON COBURN LLP

Victim entityTHOMPSON COBURN LLP

Incidentdiscovered May 29, 2024

Stated responseLaunched an investigation into the nature and scope of the activity with the assistance of third-party forensic specialists

ComplianceSC CRA notice due

Extraction provenanceno artifact recorded

Source provenanceconsumer.sc.gov