HackingManufacturingManufacturingVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedTargetedIdentity (basic)Financial accountMediumContained

NUCOR CORPORATION

bd_e41f2b66830eb9a2 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 1, 2023

Filed

Jul 3, 2023

To disclose

5 weeks

Affected

1,330state residents only

Linked

7 filings

Confidence

64%

Full breach record for NUCOR CORPORATION →4 incidents on file

Nucor Corporation notified South Carolina residents of a data breach involving a third-party file transfer software vulnerability. Unauthorized access occurred between May 26 and June 1, 2023, exposing names, bank account numbers, routing numbers, and deposit amounts. Nucor disabled access, applied vendor fixes, engaged forensic investigators, and offered two years of Equifax credit monitoring.

J jump to incidentP pin to compareR raw source

South Carolina clock✓ SC CRA notice due5 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 6 days

discovery → filing · 5 weeks / 32 days

May 26, 2023

Begins

Jun 1, 2023

Discovered

Jul 3, 2023

Filed

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Maine State AGbd_6a06b9eb150003e92023-07-03Verified
New Hampshire State AGbd_b6fb6e4436443cf82023-07-03Verified
Massachusetts State AGbd_3aca0330760bae952023-06-30 · +3dVerified
Indiana State AGbd_9aeca2689eec0ada2023-06-30 · +3dVerified

Show 2 more filings ↓up to 183d gap

Vermont State AGbd_f92fdb8fcfe3ebf12023-06-30 · +3dVerified
Illinois State AGbd_424a1f9fd75075542023-01-01 · +183dCandidate

Name: NUCOR CORPORATION
norm: nucor
Domain: nucor.com

Name: NUCOR CORPORATION
norm: nucor
Domain: nucor.com
Industry: Manufacturingllm

Discovered: Jun 1, 2023
Breach occurred: May 26, 2023 – Jun 1, 2023
Undetected for: 6 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1,330state-resident count only
Data types: Identity (basic)Financial account
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: notified, or will notify, state regulators and consumer reporting agencies
Initial access: exploit_public_facing

During the incident: Immediately disabled external access to the software
Applied the security fix provided by the vendor
Launched an extensive investigation with assistance from an external cybersecurity firm
Providing written notice of this incident to those impacted
Notified, or will notify, state regulators and consumer reporting agencies
Offering a two (2) year subscription to Equifax’s CompleteTM Premier service at no cost
Changes made: Applied the security fix provided by the vendor
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(32 days from discovery to filing)
Compliance flags: SC CRA notice due
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 7 states

View merged incident ↗

Illinois State AGJan 1 · first

Massachusetts State AG+180d

Indiana State AG+180d

Vermont State AG+180d

Maine State AG+183d

New Hampshire State AG+183d

South Carolina State AG+183d · this page

Pattern: first filing Jan 1 (IL), last Jul 3 (SC) — a 183-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://consumer.sc.gov/sites/consumer/files/Documents/Security%20Breach%20Notices/NucorCorporation.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 3, 2023
Raw hash: 7feb6076c3bc2f7cc5abd4ed778d7532f49210f65b01ff1c789e896fe695715a

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityNUCOR CORPORATION

Victim entityNUCOR CORPORATION

Incidentdiscovered Jun 1, 2023

Stated responseImmediately disabled external access to the software

ComplianceSC CRA notice due

Extraction provenanceno artifact recorded

Source provenanceconsumer.sc.gov