HackingManufacturingManufacturingStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

CORNERSTONE BUILDING BRANDS, INC.

bd_72b5212b6bcca4aa · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 16, 2019

Filed

Sep 10, 2019

To disclose

25 days

Affected

8state residents only

Linked

4 filings

Confidence

66%

Full breach record for CORNERSTONE BUILDING BRANDS, INC. →3 incidents on file

Cornerstone Building Brands, Inc. notified the NH AG that an unauthorized person accessed two employee email accounts between April 1-2, 2019. On August 16, 2019, the company determined 8 NH residents' PII (names, SSNs, financial/payment card info) was accessed. Notifications were sent September 11, 2019, offering 1 year of credit monitoring.

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Incident timeline

undetected · 137 days

discovery → filing · 25 days

Apr 1, 2019

Begins

Aug 16, 2019

Discovered

Sep 10, 2019

Filed

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

California State AGbd_387bdc6cec92f2062019-09-11 · +1dVerified
Massachusetts State AGbd_b2d3a9294f08d9a82019-09-11 · +1dVerified
Montana State AGbd_c14cf158c86f17702019-09-11 · +1dCandidate

Name: CORNERSTONE BUILDING BRANDS, INC.
norm: cornerstone building brands

Name: CORNERSTONE BUILDING BRANDS, INC.
norm: cornerstone building brands
Industry: Manufacturingllm

Discovered: Aug 16, 2019
Breach occurred: Apr 1, 2019 – Apr 2, 2019
Undetected for: 137 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 11, 2019
Affected individuals: 8state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified New Hampshire Office of the Attorney General
Initial access: valid_credentials

During the incident: Took steps to secure the accounts
Launched an investigation
A cyber security firm was engaged to assist
Changes made: Providing additional data-security training to employees
Enhancing existing security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 days(25 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

New Hampshire State AGSep 10 · first · this page

California State AG+1d

Massachusetts State AG+1d

Montana State AG+1d

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://mm.nh.gov/files/uploads/doj/remote-docs/cornerstone-building-20190912.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 10, 2019
Raw hash: 15c5fc50c41ac52a86f384c1bdd3b0f426c6f0361f98daedfee872cb8c62aa02

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityCORNERSTONE BUILDING BRANDS, INC.

Victim entityCORNERSTONE BUILDING BRANDS, INC.

Incidentdiscovered Aug 16, 2019

Stated responseTook steps to secure the accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov