HackingFinancial ServicesFinanceVulnerability ExploitCapture Stored DataData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)PIIIdentity (basic)LowContained

Stockman Bank of Montana

bd_035aefcad4f9f044 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 31, 2023

Filed

Aug 8, 2023

To disclose

10 weeks

Affected

1state residents only

Linked

5 filings

Confidence

65%

Full breach record for Stockman Bank of Montana →

Stockman Bank notified the New Hampshire Attorney General of a security incident involving one resident. Unauthorized access occurred May 30-31, 2023, via a vulnerability in the MOVEit file transfer tool used by vendor Progress Software. Personal information (name, etc.) of one NH resident was exfiltrated. Stockman engaged forensic investigators, implemented mitigations, and offered credit monitoring.

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Incident timeline

undetected · 1 days

discovery → filing · 10 weeks / 69 days

May 30, 2023

Begins

May 31, 2023

Discovered

Aug 4, 2023

Scope determined

Aug 8, 2023

Filed

vs. sector median

+1 wks slower

This filing is one of 5 about the same incident.View merged incident

Part of Progress Software Corporation supply-chain incident (2023) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Montana State AGbd_353f8ae784f3b6b82023-08-08Candidate
Maine State AGbd_3facb6f42c9113c12023-08-08Verified
Massachusetts State AGbd_78096caa5f6eb5012023-08-08Verified
Indiana State AGbd_6ea7a09b7301a8c32023-08-07 · +1dVerified

Name: Stockman Bank of Montana
norm: stockman bank of montana

Name: Stockman Bank of Montana
norm: stockman bank of montana
Industry: Financial Servicesllm

Discovered: May 31, 2023
Breach occurred: May 30, 2023 – May 31, 2023
Undetected for: 1 dayoccurrence → discovery
Materiality determined: Aug 4, 2023
Notification sent: Aug 7, 2023
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified Attorney General John Formella
Third party: via Progress Software
Initial access: exploit_public_facing

During the incident: Engaged a cybersecurity firm to assist with an investigation
Restricting access to the MOVEit server
Implementing Progress Software’s recommended mitigation steps
Putting in place further mitigations identified internally to secure our MOVEit system
Examining other systems in our environment
Offering the New Hampshire resident a complimentary, membership to credit monitoring and identity theft protection services
Established a dedicated call center
Changes made: Use the findings from the investigation to look for additional opportunities to further strengthen its cybersecurity
Implement additional safeguards and security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 weeks(69 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 5 filings · 5 states

View merged incident ↗

Indiana State AGAug 7 · first

Montana State AG+1d

Maine State AG+1d

Massachusetts State AG+1d

New Hampshire State AG+1d · 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://mm.nh.gov/files/uploads/doj/remote-docs/stockman-bank-20230808.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 8, 2023
Raw hash: 144e4860c4b6104c7b960d1217c776b181321d923c426b24b5849dbb89bb1fda

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityStockman Bank of Montana

Victim entityStockman Bank of Montana

Incidentdiscovered May 31, 2023

Stated responseEngaged a cybersecurity firm to assist with an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov