Social EngineeringProfessional ServicesProfessional ServicesPhishingTargetedPIIIdentity (basic)LowContained

Kasting, Kauffman, & Mersen, P.C.

bd_a7cc7f1fb3500949 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jan 12, 2022

Filed

Feb 11, 2022

To disclose

4 weeks

Affected

427state residents only

Confidence

66%

Full breach record for Kasting, Kauffman, & Mersen, P.C. →

Kasting, Kauffman & Mersen, P.C. notified Montana residents that an unauthorized party accessed an employee email account prior to September 22, 2020. The firm discovered the breach on January 12, 2022, after a forensic investigation. No evidence of misuse was found. The firm offered one year of Experian IdentityWorks credit monitoring.

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Incident timeline

undetected · 477 days

discovery → filing · 4 weeks / 30 days

Sep 22, 2020

Begins

Jan 12, 2022

Discovered

Feb 11, 2022

Filed

vs. sector median

14 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed427 affectedView incident

Name: Kasting, Kauffman, & Mersen, P.C.
norm: kasting kauffman mersen

Name: Kasting, Kauffman, & Mersen, P.C.
norm: kasting kauffman mersen
Industry: Professional Servicesllm

Discovered: Jan 12, 2022
Breach occurred: Sep 22, 2020
Undetected for: 477 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 12, 2022
Affected individuals: 427state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Secured the compromised email account
Commenced a prompt and thorough investigation
Worked closely with external cybersecurity professionals
Conducted an extensive forensic investigation and manual document review
Offered a complimentary one-year membership of Experian IdentityWorksSM Credit 3B
Changes made: Continually evaluate and modify practices to enhance the security and privacy of personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(30 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/OCP/Consumer-Notification-Letter-223.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 11, 2022
Raw hash: ecbba5a2bc609d6053e0efa1a898ebaaade7e4f5d574b7407e823b22c2c644ce

Reporting entityKasting, Kauffman, & Mersen, P.C.

Victim entityKasting, Kauffman, & Mersen, P.C.

Incidentdiscovered Jan 12, 2022

Stated responseSecured the compromised email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov