Social EngineeringProfessional ServicesProfessional ServicesPhishingStolen CredentialsTargetedPIIIdentity (basic)LowContained

B&C Mechanical Services, LLC

bd_8334e2f671056110 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 5, 2020

Filed

Jul 23, 2020

To disclose

7 weeks

Affected

1state residents only

Confidence

65%

Full breach record for B&C Mechanical Services, LLC →

B&C Mechanical Services, LLC notified Montana residents of a data breach where an email account was compromised via phishing between May 13 and June 5, 2020. The incident was discovered on June 5, 2020. Personal information including names may have been accessed. The company engaged forensic investigators and provided two years of free identity monitoring through TransUnion.

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Incident timeline

undetected · 23 days

discovery → filing · 7 weeks / 48 days

May 13, 2020

Begins

Jun 5, 2020

Discovered

Jul 23, 2020

Filed

vs. sector median

11 wks faster

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

Name: B&C Mechanical Services, LLC
norm: b c mechanical

Name: B&C Mechanical Services, LLC
norm: b c mechanical
Industry: Professional Servicesllm

Discovered: Jun 5, 2020
Breach occurred: May 13, 2020 – Jun 5, 2020
Undetected for: 23 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 16, 2020
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: Engaged an industry-leading forensic investigation firm
Secured TransUnion to provide identity monitoring at no cost to you for two (2) years
Changes made: Implemented additional technical security measures designed to prevent similar incidents from occurring in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(48 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/BC-Mechanical-Services-LLC-Consumer-Ltr.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 23, 2020
Raw hash: 2dbaa9bd9a04d1e888de304011c07a514968820559c8437ebaa2bd930ab2521c

Reporting entityB&C Mechanical Services, LLC

Victim entityB&C Mechanical Services, LLC

Incidentdiscovered Jun 5, 2020

Stated responseEngaged an industry-leading forensic investigation firm

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov