HackingProfessional ServicesProfessional ServicesStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Government IDMediumContained

Copeland Buhl

bd_3d2dc2a5b0540322 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 9, 2024

Filed

Feb 21, 2025

To disclose

19 weeks

Affected

6state residents only

Confidence

65%

Full breach record for Copeland Buhl →

Copeland Buhl, an accounting firm, notified Montana residents of a security incident where an unknown actor accessed an employee workstation between Oct 4-9, 2024. The actor may have viewed or copied names and Social Security numbers. Copeland Buhl shut down the workstation, launched an investigation, and is offering 12 months of credit monitoring.

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Incident timeline

undetected · 5 days

discovery → filing · 19 weeks / 135 days

Oct 4, 2024

Begins

Oct 9, 2024

Discovered

Feb 21, 2025

Filed

vs. sector median

+1 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed6 affectedView incident

Name: Copeland Buhl
norm: copeland buhl
Domain: copelandbuhl.com

Name: Copeland Buhl
norm: copeland buhl
Domain: copelandbuhl.com
Industry: Professional Servicesllm

Discovered: Oct 9, 2024
Breach occurred: Oct 4, 2024 – Oct 9, 2024
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 14, 2025
Affected individuals: 6state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: notifying relevant state regulators
Initial access: valid_credentials

During the incident: Took quick steps to shut the workstation down
Ensure the security of the system
Launched an investigation
Notifying relevant state regulators
Offering 12 months of complimentary credit monitoring through IDX
Changes made: Reviewing our policies, procedures, and employee training protocols to reduce the risk of a similar event from occurring in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 weeks(135 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/2025/03/Consumer-notification-letter-149.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 21, 2025
Raw hash: 1d0c68e72372fbb60b8f1571a868e339aa537e89970d0056863c487b4f87aa1f

Reporting entityCopeland Buhl

Victim entityCopeland Buhl

Incidentdiscovered Oct 9, 2024

Stated responseTook quick steps to shut the workstation down

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov