MalwareProfessional ServicesProfessional ServicesRansomwareData ExfiltratedData EncryptedRansom DemandedIdentity (basic)Government IDMediumContained

Montrose Environmental Group, Inc

bd_9a97127a2612bae8 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 11, 2022

Filed

Sep 6, 2022

To disclose

12 weeks

Affected

2state residents only

Linked

4 filings

Confidence

65%

Full breach record for Montrose Environmental Group, Inc →

Montrose Environmental Group, Inc. notified Montana residents of a ransomware attack discovered on June 11, 2022. Unauthorized access occurred between June 8-11, 2022, potentially exposing employee and client names, dates of birth, and driver's license numbers. Montrose engaged third-party specialists, reset passwords, notified law enforcement, and offered 12 months of credit monitoring.

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Incident timeline

undetected · 3 days

discovery → filing · 12 weeks / 87 days

Jun 8, 2022

Begins

Jun 11, 2022

Discovered

Sep 6, 2022

Filed

vs. sector median

6 wks faster

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

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
Maine State AGbd_42ac8acf41f1dc5a2022-09-06Verified

Name: Montrose Environmental Group, Inc
norm: montrose environmental

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

Discovered: Jun 11, 2022
Breach occurred: Jun 8, 2022 – Jun 11, 2022
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 6, 2022
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified law enforcement

During the incident: Engaged third-party specialists
Resetting relevant account passwords
Notified law enforcement
Changes made: Offering 12 months of complimentary credit monitoring and identity protection services through Experian
Evaluating existing policies, procedures, and processes to determine whether additional measures are appropriate
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 12 weeks(87 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGSep 6 · first

Maine State AGSep 6 · first

Montana 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://dojmt.gov/wp-content/uploads/OCP/Consumer-Notification-Letter-546.pdf
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: 56bcbc5ffe50dc1ab088123258ef74f75a22fdb461dde9c1e33794e495071d4f

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityMontrose Environmental Group, Inc

Victim entityMontrose Environmental Group, Inc

Incidentdiscovered Jun 11, 2022

Stated responseEngaged third-party specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov