HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Drost Kivlahan McMahon & O'Connor LLC

bd_80bff10e0475a3a3 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jan 22, 2024

Filed

Aug 29, 2024

To disclose

31 weeks

Affected

Not disclosed

Linked

8 filings

Confidence

63%

Full breach record for Drost Kivlahan McMahon & O'Connor LLC →

Drost Kivlahan McMahon & O’Connor LLC (DKMO) notified New Hampshire residents of a network breach occurring between Dec 30, 2023 and Jan 22, 2024. An unauthorized actor accessed files containing names and government IDs. DKMO engaged forensic specialists, determined impacted data by July 30, 2024, and offered credit monitoring. No fraudulent misuse was identified.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d31 weeks discovery → filing

Incident timeline

undetected · 23 days

discovery → filing · 31 weeks / 220 days

Dec 30, 2023

Begins

Jan 22, 2024

Discovered

Jul 30, 2024

Scope determined

Aug 29, 2024

Filed

vs. sector median

+13 wks slower

This filing is one of 8 about the same incident.View merged incident

A leak claim by bianlian about this victim predates this filing by 201 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitebianlianbd_ad42d877b2791beb2024-02-09 · +201dVerified by operator

Regulatory filings (6) · sorted by filing gap

Maine State AGbd_06cf8f5a53ec4a462024-08-29Verified
Montana State AGbd_4092b2b66591e42b2024-08-29Verified
Massachusetts State AGbd_60d7ee977e50e02d2024-08-29Verified by operator
Vermont State AGbd_93443d977d8450b82024-08-29Verified

Show 2 more filings ↓up to 28d gap

Indiana State AGbd_9f7fbabc75af16a72024-08-29Verified
Illinois State AGbd_13a9d7461e7394a22024-08-01 · +28dVerified by operator

Name: Drost Kivlahan McMahon & O'Connor LLC
norm: drost kivlahan mcmahon o connor
Domain: dkmolaw.com

Name: Drost Kivlahan McMahon & O'Connor LLC
norm: drost kivlahan mcmahon o connor
Domain: dkmolaw.com
Industry: Professional Servicesllm

Discovered: Jan 22, 2024
Breach occurred: Dec 30, 2023 – Jan 22, 2024
Undetected for: 23 daysoccurrence → discovery
Materiality determined: Jul 30, 2024
Notification sent: Aug 29, 2024
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: notifying regulators, as necessary
Initial access: valid_credentials

During the incident: Launched an investigation into the nature and scope of the event with the assistance of third-party forensic specialists
Undertook a comprehensive and time-intensive review of all potentially impacted files with the assistance of third-party data review specialists
Offering you access to ## months of credit monitoring and identity theft protection services by Experian
Notifying regulators, as necessary
Changes made: Implementing additional technical security measures to strengthen the security of our systems
Reviewing and enhancing our existing data privacy policies and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 31 weeks(220 days from discovery to filing)
Compliance flags: Leak >180d
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 · 7 filings · 7 states

View merged incident ↗

Illinois State AGAug 1 · first

Maine State AG+28d

Montana State AG+28d

Massachusetts State AG+28d

Vermont State AG+28d

Indiana State AG+28d

New Hampshire State AG+28d · this page

Pattern: first filing Aug 1 (IL), last Aug 29 (NH) — a 28-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://mm.nh.gov/files/uploads/doj/remote-docs/drost-kivlahan-mcmahon-oconnor-20240829.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 29, 2024
Raw hash: 5123fc333758d6cb9c376d377a64426d12d039aa1d10817a43ff0fbfeafed52f

Linked disclosures

Ransomware claims (1)

Regulatory filings (6) · sorted by filing gap

Reporting entityDrost Kivlahan McMahon & O'Connor LLC

Victim entityDrost Kivlahan McMahon & O'Connor LLC

Incidentdiscovered Jan 22, 2024

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

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov