Social EngineeringProfessional ServicesProfessional ServicesPhishingStolen CredentialsCustomer Data InvolvedTargetedPIIIdentity (basic)LowContained

Wipfli

bd_0bff287869375852 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 14, 2020

Filed

Sep 24, 2020

To disclose

10 days

Affected

43state residents only

Confidence

66%

Full breach record for Wipfli →2 incidents on file

Wipfli, LLP notified Montana residents of a phishing incident that compromised an employee's email account. Unauthorized access occurred between May 2-4, 2020. The firm secured the account, engaged forensic investigators, and determined personal information was accessed. No evidence of misuse was found. Wipfli offered 12 months of credit monitoring and identity theft protection.

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Incident timeline

undetected · 135 days

discovery → filing · 10 days

May 2, 2020

Begins

Sep 14, 2020

Discovered

Sep 24, 2020

Filed

vs. sector median

18 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed43 affectedView incident

Name: Wipfli
norm: wipfli
Domain: wipfli.com

Name: Wipfli
norm: wipfli
Domain: wipfli.com
Industry: Professional Servicesllm

Discovered: Sep 14, 2020
Breach occurred: May 2, 2020 – May 4, 2020
Undetected for: 135 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 43state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Secured the email account
Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals
Conducted an extensive forensic investigation
Performed manual email review
Offered complimentary identity theft protection services through ID Experts’®, MyIDCareTM
Changes made: Continually evaluate and modify practices and internal controls to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 days(10 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/wipfli-sample.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 24, 2020
Raw hash: 3d6d88f77404ee57e27eb0d210388454028319929252449ff57f4122ee8c4c4d

Reporting entityWipfli

Victim entityWipfli

Incidentdiscovered Sep 14, 2020

Stated responseSecured the email account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov