HackingManufacturingManufacturingStolen CredentialsTargetedData ExfiltratedPIIIdentity (basic)Government IDFinancial accountMediumContained

CORNERSTONE BUILDING BRANDS, INC.

bd_4421f5071590feb4 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 1, 2020

Filed

May 21, 2021

To disclose

24 weeks

Affected

1state residents only

Linked

3 filings

Confidence

64%

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

Cornerstone Building Brands notified individuals of a security incident in late December 2020 where an unauthorized party accessed employee information. The company engaged forensic investigators and law enforcement. Affected data likely included PII and financial data. One-year identity monitoring via Kroll was offered.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · 24 weeks / 171 days

Dec 1, 2020

Begins

Dec 1, 2020

Discovered

May 21, 2021

Filed

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Maine State AGbd_3e6bb6a0d421c8b12021-05-21Candidate
Indiana State AGbd_c75a17f9404c2c142021-05-21Verified

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

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

Discovered: Dec 1, 2020
Breach occurred: Dec 1, 2020 – Dec 31, 2020
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 21, 2021
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)Government IDFinancial account
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notify law enforcement
Initial access: valid_credentials

During the incident: Took immediate steps to further secure our network
Notify law enforcement
Launch an investigation with a leading forensics firm
Conducted a comprehensive review of the files involved
Arranged to provide identity monitoring at no cost to you for one year through Kroll
Changes made: Implemented enhanced network monitoring tools
Further strengthened our security processes
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 weeks(171 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Maine State AGMay 21 · first

Indiana State AGMay 21 · first

Montana State AGMay 21 · 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://dojmt.gov/wp-content/uploads/corner-notif.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 21, 2021
Raw hash: d1415e1951d279e27f8a1c362232ba17d70aea0cc6f5b14d3aa17fee93e60b03

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityCORNERSTONE BUILDING BRANDS, INC.

Victim entityCORNERSTONE BUILDING BRANDS, INC.

Incidentdiscovered Dec 1, 2020

Stated responseTook immediate steps to further secure our network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov