MalwareTechnologyManufacturingInformationDelayed DiscoveryPIIIdentity (basic)LowActive

Mevion Medical Systems, Inc.

bd_7e7d32019136fbc0 · schema v1 · pii pii-v1

Severity

Low

Discovered

Apr 8, 2021

Filed

Jun 17, 2021

To disclose

10 weeks

Affected

1state residents only

Linked

5 filings

Confidence

65%

Full breach record for Mevion Medical Systems, Inc. →

Mevion Medical Systems notified employees of a security incident where an unknown actor accessed systems between March 28-29, 2021. The company discovered the malware impact on April 8, 2021, engaged forensic specialists, and notified law enforcement. Identity monitoring services were offered to affected individuals.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 11 days

discovery → filing · 10 weeks / 70 days

Mar 28, 2021

Begins

Apr 8, 2021

Discovered

Jun 17, 2021

Filed

vs. sector median

9 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Maine State AGbd_cd98cb902cdd7b082021-06-17Verified
Massachusetts State AGbd_d48161f16b6959192021-06-17Verified
Indiana State AGbd_eb265913f6d9a55f2021-06-17Verified
New Hampshire State AGbd_b2c548c8089047042021-06-21 · +4dVerified

Name: Mevion Medical Systems, Inc.
norm: mevion medical

Name: Mevion Medical Systems, Inc.
norm: mevion medical
Industry: TechnologyllmManufacturingllm

Discovered: Apr 8, 2021
Breach occurred: Mar 28, 2021 – Mar 29, 2021
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 17, 2021
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unknown
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1078 Valid Accounts
Threat actor: External
Regulator citations: notified federal law enforcement and relevant state regulators

During the incident: Launched an investigation with the assistance of third-party forensic specialists
Notified federal law enforcement and relevant state regulators
Arranged to have Experian provide identity monitoring services for 24 months at no cost to you
Changes made: Took steps to assess and improve the security of our network
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(70 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Maine State AGJun 17 · first

Massachusetts State AGJun 17 · first

Indiana State AGJun 17 · first

Montana State AGJun 17 · first · this page

New Hampshire State AG+4d

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/mmsSamp.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 17, 2021
Raw hash: c6153b9e95e2ceb55f2eab3508bf946d9f1e7316258ae3a8de033d293c35e94b

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityMevion Medical Systems, Inc.

Victim entityMevion Medical Systems, Inc.

Incidentdiscovered Apr 8, 2021

Stated responseLaunched an investigation with the assistance of third-party forensic specialists

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov