MalwareTechnologyManufacturingInformationRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedGovernment IDIdentity (basic)MediumActive

MKS Instruments, Inc

bd_40fb17ba9f50a304 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 13, 2023

Filed

Feb 16, 2023

To disclose

2 days

Affected

8state residents only

Linked

8 filings

Confidence

67%

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

MKS Instruments, Inc. reported a ransomware event in Maine affecting 8 residents. Discovered on February 13, 2023, the incident involved encryption of business/manufacturing systems and potential exfiltration of personal data, including Social Security Numbers. MKSI activated incident response protocols, engaged outside experts, notified law enforcement, and provided 2 years of Equifax identity monitoring services.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Feb 13, 2023 → Filed with AG Feb 16, 20233d ✓ ME AG ≤30d2 days discovery → filing

Incident timeline

discovery → filing · 3 days

Feb 13, 2023

Discovered

Feb 16, 2023

Filed

vs. sector median

11 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

Indiana State AGbd_469c34ddf4169c5b2023-02-16Verified
Montana State AGbd_488d1bfaf6139cd52023-02-16Verified
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: 8state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial

During the incident: Activated its incident response and business continuity protocols
Initiated an ongoing investigation alongside outside experts
Reported the issue to U.S. law enforcement
Issued a public statement regarding the incident
Temporarily suspended certain operations
Restoring various systems
Changes made: Provided identity monitoring services provided by Equifax at no cost to affected consumers for 2 years
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 2 days(2 days from discovery to filing)
Compliance flags: ME AG ≤30d · 3d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Feb 13, 2023
→ Filed with AG: Feb 16, 2023
3d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Feb 13, 2023 → Filed with AG: Feb 16, 2023	3d	30 days	ME AG ≤30d

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

Indiana State AG+10d

Montana State AG+10d

Maine State AG+10d · this page

Pattern: first filing Feb 6, last Feb 16 (ME) — 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/5b274063-f49b-49f5-875f-8245bc8bcc0e.shtml
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: a47688425597225ac6d81ac97180f0457f4f3009b68370827a8e0e12cc8102d5

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityMKS Instruments, Inc

Victim entityMKS Instruments, Inc

Incidentdiscovered Feb 13, 2023

Stated responseActivated its incident response and business continuity protocols

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov