HackingProfessional ServicesProfessional ServicesCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDMediumContained

Greylock McKinnon Associates

bd_c834268ced33fa4f · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 30, 2023

Filed

Jun 28, 2024

To disclose

13 months

Affected

Not disclosed

Linked

4 filings

Confidence

65%

Full breach record for Greylock McKinnon Associates →4 incidents on file

Greylock McKinnon Associates, Inc. (GMA), a consulting firm, detected unusual network activity on May 30, 2023. A forensic review completed in March 2024 determined that personal information, including names, addresses, and Social Security numbers, may have been affected. GMA engaged third-party cybersecurity specialists and notified law enforcement. Affected individuals are offered 12 months of complimentary Experian IdentityWorks. Specific counts were not disclosed in the filing, though residents of Rhode Island (12) and Texas (152) were noted in the letter.

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California clockDiscovered May 30, 2023 → Notified Jun 28, 2024395d ✗ CA 60-day late13 months discovery → filing

Incident timeline

discovery → filing · 13 months / 395 days

May 30, 2023

Begins

May 30, 2023

Discovered

Jun 28, 2024

Filed

vs. sector median

+39 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Maine State AGbd_790022af687f40602024-06-28Verified
Indiana State AGbd_ea8903fb7483d4252024-06-28Verified
New Hampshire State AGbd_4a2dc486a8f38bcb2024-06-27 · +1dVerified

Name: Greylock McKinnon Associates
norm: greylock mckinnon associates
Domain: www.gma-us.com

Name: Greylock McKinnon Associates
norm: greylock mckinnon associates
Domain: www.gma-us.com
Industry: Professional Servicesllm

Discovered: May 30, 2023
Breach occurred: May 30, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 28, 2024
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Data elements: Social Security numberDate of birth
Attack vector: Unknown
Threat actor: External

During the incident: Detected unusual activity on our internal network
Promptly took steps to mitigate the incident
Consulted with third-party cybersecurity specialists to assist with our response to the incident
Notified law enforcement
Conducted extensive forensic review
Notified our client
Offered to provide notification to affected individuals
Changes made: Consulted with third-party cybersecurity specialists to assist with remediation of the incident
Offering complimentary access to Experian IdentityWorks for 12 months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 months(395 days from discovery to filing)
Compliance flags: CA 60-day late · 395d
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
California
Discovered: May 30, 2023
→ Notified: Jun 28, 2024
395d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: May 30, 2023 → Notified: Jun 28, 2024	395d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

New Hampshire State AGJun 27 · first

Maine State AG+1d

Indiana State AG+1d

California State AG+1d · 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://oag.ca.gov/ecrime/databreach/reports/sb24-587692
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 28, 2024
Raw hash: 8676bc99620657afaf6b38cdb72ee923800d55b4084180a1dc72ae1d52ab6596

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityGreylock McKinnon Associates

Victim entityGreylock McKinnon Associates

Incidentdiscovered May 30, 2023

Stated responseDetected unusual activity on our internal network

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov