HackingProfessional ServicesProfessional ServicesVulnerability ExploitData ExfiltratedCustomer Data InvolvedGovernment IDIdentity (basic)HighContained

Greylock McKinnon Associates

bd_e0ca51cf3adad76c · schema v1 · pii pii-v1

Severity

High

Discovered

Feb 5, 2024

Filed

Feb 23, 2024

To disclose

18 days

Affected · nationwide

5,4653 in this filing

Linked

12 filings

Confidence

66%

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

Greylock McKinnon Associates, Inc. reported an external system breach (hacking) occurring on May 30, 2023, discovered on February 5, 2024. The incident affected 5,465 individuals, including 3 Maine residents. Acquired data included names and Social Security Numbers. The entity provided 12 months of credit monitoring through Experian IdentityWorks.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Feb 5, 2024 → Filed with AG Feb 23, 202418d ✓ ME AG ≤30d18 days discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 251 days

discovery → filing · 18 days

May 30, 2023

Begins

Feb 5, 2024

Discovered

Feb 23, 2024

Filed

vs. sector median

17 wks faster

This filing is one of 12 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Montana State AGbd_08e358e2c4d44d732024-02-23Verified
New Hampshire State AGbd_8b8abd614469d3d92024-02-23Verified
Massachusetts State AGbd_e352425b0bc9b1d92024-02-23Candidate
Indiana State AGbd_ebe27468fd5864a12024-02-23Verified

Show 6 more filings ↓up to 53d gap

New Hampshire State AGbd_8b7ba321f28889a02024-04-04 · +41dVerified
South Carolina State AGbd_4f59e4feb1207f512024-04-05 · +42dVerified
Maine State AGbd_524d78fcdff1e19d2024-04-05 · +42dVerified
Oregon State AGbd_ba7fccfadfcbb07d2024-04-05 · +42dVerified
California State AGbd_c55a125d8e9e0f582024-04-05 · +42dVerified
Washington State AGbd_862de986dcc37c522024-04-16 · +53dVerified

Showing first 10 of 11 linked disclosures.

Name: Greylock McKinnon Associates
norm: greylock mckinnon associates

Name: Greylock McKinnon Associates
norm: greylock mckinnon associates
Industry: Professional Servicesllm

Discovered: Feb 5, 2024
Breach occurred: May 30, 2023
Undetected for: 251 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 23, 2024
Affected individuals: 5,465state + nationwide
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Sent written notification to affected individuals
Offered 12 months of Experian IdentityWorks identity theft protection and credit monitoring
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 days(18 days from discovery to filing)
Compliance flags: ME AG ≤30d · 18d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Feb 5, 2024
→ Filed with AG: Feb 23, 2024
18d 30 days ME AG ≤30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Feb 5, 2024 → Filed with AG: Feb 23, 2024	18d	30 days	ME AG ≤30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 9 states

View merged incident ↗

Montana State AGFeb 23 · first

New Hampshire State AGFeb 23 · first

Massachusetts State AGFeb 23 · first

Indiana State AGFeb 23 · first

Maine State AGFeb 23 · first · this page

New Hampshire State AG+41d

South Carolina State AG+42d

Maine State AG+42d

Oregon State AG+42d

California State AG+42d

Washington State AG+53d

Pattern: first filing Feb 23 (MT), last Apr 16 (WA) — a 53-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

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/c8e05b1c-ddad-475b-b643-39e62eaefab7.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 23, 2024
Raw hash: da8fb54040107475f8b73524ca7a4ee1501d802e8c31c220813cba8018cb7bfc

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityGreylock McKinnon Associates

Victim entityGreylock McKinnon Associates

Incidentdiscovered Feb 5, 2024

Stated responseSent written notification to affected individuals

ComplianceME AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov