HackingProfessional ServicesProfessional ServicesTargetedIdentity (basic)MediumContained

Greylock McKinnon Associates

bd_aac174ee3e612c5d · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 30, 2023

Filed

Oct 29, 2024

To disclose

17 months

Affected · nationwide

13,5493 in this filing

Confidence

66%

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

Greylock McKinnon Associates, Inc. reported an external system breach (hacking) on May 30, 2023, affecting 13,549 individuals, including 3 Maine residents. Personal information (name, address) was potentially compromised. The company engaged third-party cybersecurity specialists, notified law enforcement, and offered 12-24 months of Experian IdentityWorks services. Notification letters were sent on October 29, 2024.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered May 30, 2023 → Filed with AG Oct 29, 2024518d ✗ ME AG >90d17 months discovery → filing

Incident timeline

discovery → filing · 17 months / 518 days

May 30, 2023

Begins

May 30, 2023

Discovered

Oct 29, 2024

Filed

vs. sector median

+56 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed13,549 affectedView incident

Name: ROBINSON & COLE LLP
norm: robinson cole

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

Discovered: May 30, 2023
Breach occurred: May 30, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 29, 2024
Affected individuals: 13,549state + nationwide
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1119 Automated Collection
Threat actor: External
Regulator citations: Filed notification with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Consulted with third-party cybersecurity specialists to assist with our response to the incident
Notified law enforcement of the incident
Changes made: Consulted with third-party cybersecurity specialists to assist with our response to and remediation of the incident
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 months(518 days from discovery to filing)
Compliance flags: ME AG >90d · 518dME resident >180d · 518d
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: May 30, 2023
→ Filed with AG: Oct 29, 2024
518d 90 days ME AG >90d
Maine
Discovered: May 30, 2023
→ Notified: Oct 29, 2024
518d 180 days ME resident >180d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: May 30, 2023 → Filed with AG: Oct 29, 2024	518d	90 days	ME AG >90d
Maine	Discovered: May 30, 2023 → Notified: Oct 29, 2024	518d	180 days	ME resident >180d

Status: No extraction artifact recorded for this disclosure.

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/e372226a-bcbf-4a4e-82e2-dc0455682861.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 29, 2024
Raw hash: 9aa294a65ab73ebdd59f1b0a34b35e2866ac52b8c6d7b67e90aaea4e2868fbcc

Reporting entityROBINSON & COLE LLP

Victim entityGreylock McKinnon Associates

Incidentdiscovered May 30, 2023

Stated responseConsulted with third-party cybersecurity specialists to assist with our response to the incident

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov