MalwareProfessional ServicesProfessional ServicesRansomwareData EncryptedData ExfiltratedEmployee Data InvolvedEmploymentFinancial accountIdentity (basic)Government IDMediumContained

Carlysle Engineering, Inc.

bd_ea8abc29297e1932 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 23, 2026

Filed

May 14, 2026

To disclose

7 weeks

Affected

145state residents only

Linked

4 filings

Confidence

65%

Full breach record for Carlysle Engineering, Inc. →

Carlysle Engineering, Inc. experienced a ransomware attack on March 23, 2026, affecting its primary file server containing human resources data. The attacker encrypted files and exfiltrated data including names, addresses, dates of birth, Social Security Numbers, and driver's license numbers of current and former employees. The incident was contained on the same day. The company engaged OCD Tech for investigation and is offering 24 months of identity protection to affected individuals.

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Massachusetts clock⏱ MA AG >30d7 weeks discovery → filing

Incident timeline

discovery → filing · 7 weeks / 52 days

Mar 23, 2026

Begins

Mar 23, 2026

Discovered

May 14, 2026

Filed

vs. sector median

10 wks faster

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

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitepayloadbd_319e88349b2befce2026-03-26 · +48dCandidate

Regulatory filings (2) · sorted by filing gap

Maine State AGbd_ad4dba05a8f20d9f2026-05-14Verified
New Hampshire State AGbd_ccceb44ab78b843d2026-05-14Verified

Name: Carlysle Engineering, Inc.
norm: carlysle engineering
Domain: carlysle.net

Name: Carlysle Engineering, Inc.
norm: carlysle engineering
Domain: carlysle.net
Industry: Professional Servicesllm

Discovered: Mar 23, 2026
Breach occurred: Mar 23, 2026 – Mar 23, 2026
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 14, 2026
Affected individuals: 145state-resident count only
Data types: EmploymentFinancial accountIdentity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial

During the incident: Engaged OCD Tech, LLC, a cybersecurity recovery and investigation firm
Engaged cybersecurity legal counsel
Initiated incident response procedures, including containment and forensic investigation
Updated the security system and shut down the affected connections
Conducted a thorough review of all files to identify affected individuals
Provided written notice to all identified affected individuals
Offered 24 months of identity theft protection services through IDX
Changes made: Implementing recommendations received from OCD Tech to reduce the likelihood of a future cyberattack
Updating the firewall
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(52 days from discovery to filing)
Compliance flags: MA AG >30dLeak >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Maine State AGMay 14 · first

New Hampshire State AGMay 14 · first

Massachusetts State AGMay 14 · 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.mass.gov/doc/2026-781-carlysle-engineering-inc/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 14, 2026
Raw hash: 4e84e35a3ddf5507bee772526aeb74a2b7ab9fcb3ac6d173b4824abcd0227f93

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · sorted by filing gap

Reporting entityCarlysle Engineering, Inc.

Victim entityCarlysle Engineering, Inc.

Incidentdiscovered Mar 23, 2026

Stated responseEngaged OCD Tech, LLC, a cybersecurity recovery and investigation firm

ComplianceMA AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov