HackingManufacturingManufacturingTargetedData ExfiltratedIdentity (basic)Government IDFinancial accountHealth (basic)HighContained

STILLWATER MINING COMPANY

bd_35af31644f0003c0 · schema v1 · pii pii-v1

Severity

High

Discovered

Jul 8, 2024

Filed

Sep 7, 2024

To disclose

9 weeks

Affected

5,900state residents only

Linked

4 filings

Confidence

64%

Full breach record for STILLWATER MINING COMPANY →

Sibanye-Stillwater (via Stillwater Mining Company) notified Montana employees of a cyber-attack discovered July 8, 2024, affecting ICT systems. Unauthorized activity was identified on U.S. systems as of mid-June 2024. Impacted data included names, contact details, government IDs, SSNs, tax IDs, DOBs, bank account numbers, and health plan numbers. The incident is contained; forensic investigators and law enforcement were engaged. Affected individuals received 24 months of Experian identity monitoring.

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Incident timeline

undetected · 23 days

discovery → filing · 9 weeks / 61 days

Jun 15, 2024

Begins

Jul 8, 2024

Discovered

Sep 7, 2024

Filed

vs. sector median

2 wks faster

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

Indiana State AGbd_a1d5521ddec2d4822024-09-07Verified
Massachusetts State AGbd_0062a03edb9791fb2024-09-13 · +6dVerified
Maine State AGbd_bc602b87f1f3ec832024-09-14 · +7dVerified

Name: Sibanye-Stillwater
norm: sibanye stillwater

Name: STILLWATER MINING COMPANY
norm: stillwater mining
Industry: Manufacturingllm

Discovered: Jul 8, 2024
Breach occurred: Jun 15, 2024
Undetected for: 23 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 7, 2024
Affected individuals: 5,900state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: External
Regulator citations: Notified relevant law enforcement agencies
Initial access: exploit_public_facing

During the incident: Initiated the Incident Response plan
Engaged external cybersecurity experts and forensic firms to assist our ICT team to investigate the suspicious activity
Notified relevant law enforcement agencies
Changes made: Implementing further measures to enhance the security of our network, systems and data
Refining password policies
Investing in enhancing our end-point detection, real-time monitoring and response capabilities
Offering free identity and credit monitoring services through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(61 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 ↗

Indiana State AGSep 7 · first

Montana State AGSep 7 · first · this page

Massachusetts State AG+6d

Maine State AG+7d

Pattern: first filing Sep 7 (IN), last Sep 14 (ME) — a 7-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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-1667.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 7, 2024
Raw hash: b91b20947c2a574cbb0ddc04e934a35d003c8062242b8cb3d3df6b54972f6695

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entitySibanye-Stillwater

Victim entitySTILLWATER MINING COMPANY

Incidentdiscovered Jul 8, 2024

Stated responseInitiated the Incident Response plan

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov