Social EngineeringManufacturingManufacturingPhishingStolen CredentialsTargetedPIIIdentity (basic)LowContained

Cooper Machinery Services

bd_f5bb2c0d7af0f173 · schema v1 · pii pii-v1

Severity

Low

Discovered

Oct 7, 2020

Filed

May 14, 2021

To disclose

31 weeks

Affected

1state residents only

Confidence

65%

Full breach record for Cooper Machinery Services →

Cooper Machinery Services notified Montana residents of a phishing incident on October 7, 2020. Three employee email accounts were compromised via fraudulent emails with malicious links. Limited personal information was potentially accessed, though no evidence of misuse was found. The company reset passwords, engaged forensic experts, and offered one year of credit monitoring via Kroll.

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Incident timeline

discovery → filing · 31 weeks / 219 days

Oct 7, 2020

Begins

Oct 7, 2020

Discovered

May 14, 2021

Filed

vs. sector median

+21 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: Cooper Machinery Services
norm: cooper machinery

Name: Cooper Machinery Services
norm: cooper machinery
Industry: Manufacturingllm

Discovered: Oct 7, 2020
Breach occurred: Oct 7, 2020
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Initial access: phishing_link

During the incident: Performed an internal review
Performed a password reset for the affected accounts
Swiftly engaged a team of third-party forensic experts to investigate
Secured the affected accounts
Offered complimentary credit monitoring and identity protection services through Kroll
Changes made: Took steps to enhance the security of all information to help prevent similar incidents from occurring in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 31 weeks(219 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/Cooper-Notif.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 14, 2021
Raw hash: 94e5e1bcbde0b898d9d95bef65f48d44a68b2afe9b3dd6bef77ffadba784466e

Reporting entityCooper Machinery Services

Victim entityCooper Machinery Services

Incidentdiscovered Oct 7, 2020

Stated responsePerformed an internal review

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov