MalwareTechnologyManufacturingInformationRansomwareCapture Stored DataData ExfiltratedData EncryptedRansom DemandedCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDCredentialsFinancial accountEmploymentHealth (basic)MediumActive

MKS Instruments, Inc

bd_488d1bfaf6139cd5 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 13, 2023

Filed

Feb 16, 2023

To disclose

3 days

Affected

13state residents only

Linked

8 filings

Confidence

66%

Full breach record for MKS Instruments, Inc →2 incidents on file

MKS Instruments, Inc. notified Montana residents of a ransomware event discovered on Feb 13, 2023. The incident involved encryption of business/manufacturing systems and potential exfiltration of personal data including names, SSNs, login credentials, and financial info. The company engaged forensic experts, notified law enforcement, and is offering 2 years of free identity monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · 2 days

Feb 13, 2023

Discovered

Feb 16, 2023

Filed

vs. sector median

10 wks faster

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

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Maine State AGbd_40fb17ba9f50a3042023-02-16Candidate
Indiana State AGbd_469c34ddf4169c5b2023-02-16Verified
New Hampshire State AGbd_10609a6a1a76f0302023-02-15 · +1dVerified
California State AGbd_7ab949b29245ba5a2023-02-15 · +1dCandidate

Show 3 more filings ↓up to 10d gap

Massachusetts State AGbd_8661f29e3cdb8e162023-02-15 · +1dVerified
SEC 8-Kbd_91e20ee0c300cf702023-02-13 · +3dVerified
SEC 8-Kbd_a88f0c343179b8322023-02-06 · +10dVerified

Name: MKS Instruments, Inc
norm: mks instruments
Domain: mksinst.com

Name: MKS Instruments, Inc
norm: mks instruments
Domain: mksinst.com
Industry: TechnologyllmManufacturingllm

Discovered: Feb 13, 2023
Materiality determined: —
Notification sent: Feb 16, 2023
Affected individuals: 13state-resident count only
Data types: Identity (basic)Government IDCredentialsFinancial accountEmploymentHealth (basic)
Data elements: Social Security numberDate of birth
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: reported the issue to U.S. law enforcement

During the incident: Activated our incident response and business continuity protocols to contain the incident
Initiated an ongoing investigation, alongside outside experts
Reported the issue to U.S. law enforcement
Issued a public statement regarding the incident
Temporarily suspend certain operations
Restoring our systems
Changes made: Provide identity monitoring at no cost to you for 2 years
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 3 days(3 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 6 states

View merged incident ↗

SEC 8-KFeb 6 · first

SEC 8-K+7d

New Hampshire State AG+9d

California State AG+9d

Massachusetts State AG+9d

Maine State AG+10d

Indiana State AG+10d

Montana State AG+10d · this page

Pattern: first filing Feb 6, last Feb 16 (MT) — a 10-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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-72.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 16, 2023
Raw hash: b3c6dd82afc2bc5dd6f4760c6c861186565b0739382bd25b544f75ce81c573c2

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityMKS Instruments, Inc

Victim entityMKS Instruments, Inc

Incidentdiscovered Feb 13, 2023

Stated responseActivated our incident response and business continuity protocols to contain the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov