HackingProfessional ServicesProfessional ServicesVulnerability ExploitData ExfiltratedCustomer Data InvolvedIdentity (basic)Financial accountLowContained

Montrose Environmental Group, Inc

bd_42ac8acf41f1dc5a · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 4, 2022

Filed

Sep 6, 2022

To disclose

5 weeks

Affected · nationwide

2691 in this filing

Linked

4 filings

Confidence

66%

Full breach record for Montrose Environmental Group, Inc →

Montrose Environmental Group, Inc. reported an external system breach (hacking) occurring between June 8 and June 11, 2022, discovered on August 4, 2022. The incident affected 269 individuals, including 1 Maine resident. Acquired data included names and financial account or credit/debit card numbers (with security codes/PINs). The company provided written notification and offered 12 months of credit monitoring and identity protection services via Experian.

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Maine clockDiscovered Aug 4, 2022 → Filed with AG Sep 6, 202233d ⏱ 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 · 57 days

discovery → filing · 5 weeks / 33 days

Jun 8, 2022

Begins

Aug 4, 2022

Discovered

Sep 6, 2022

Filed

vs. sector median

14 wks faster

This filing is one of 4 about the same incident.View merged incident

A leak claim by black_basta about this victim predates this filing by 31 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteblack_bastabd_54a7efa529034e1e2022-08-06 · +31dVerified by operator

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_12626356b872f3a92022-09-06Verified by operator
Montana State AGbd_9a97127a2612bae82022-09-06Verified by operator

Name: Montrose Environmental Group, Inc
norm: montrose environmental

Name: Montrose Environmental Group, Inc
norm: montrose environmental
Industry: Professional Servicesllm

Discovered: Aug 4, 2022
Breach occurred: Jun 8, 2022 – Jun 11, 2022
Undetected for: 57 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 6, 2022
Affected individuals: 269state + nationwide
Data types: Identity (basic)Financial account
Data elements: Financial account number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Initial access: exploit_public_facing

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

Time to disclose: 5 weeks(33 days from discovery to filing)
Compliance flags: ME AG >30d · 33dLeak >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 4, 2022
→ Filed with AG: Sep 6, 2022
33d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 4, 2022 → Filed with AG: Sep 6, 2022	33d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGSep 6 · first

Montana State AGSep 6 · first

Maine State AGSep 6 · 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/c8d74d4d-43aa-4dc0-b02a-3017a8a36046.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 6, 2022
Raw hash: e996675bc0252802c47be0a3281dfa58075d39a053d0c364560f54c668d17285

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityMontrose Environmental Group, Inc

Victim entityMontrose Environmental Group, Inc

Incidentdiscovered Aug 4, 2022

Stated responseSent written notification to affected individuals

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov