HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedRansom DemandedIdentity (basic)Government IDFinancial accountEmploymentHighContained

Guthmann Tax Services

bd_4fe407fdd520662d · schema v1 · pii pii-v1

Severity

High

Discovered

Jun 25, 2025

Filed

Oct 7, 2025

To disclose

15 weeks

Affected · nationwide

2,8262 in this filing

Linked

3 filings

Confidence

66%

Full breach record for Guthmann Tax Services →

Guthmann Tax Services, Inc. reported an unauthorized access incident occurring June 16-18, 2025, discovered on June 25, 2025. An external actor used valid credentials to access systems, exfiltrate data, and file fraudulent tax returns. Affected data includes names, SSNs, and bank account details for 2,826 individuals. The company engaged forensic investigators, notified the FBI/IRS, and provided 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Jun 25, 2025 → Filed with AG Oct 7, 2025104d ✗ ME AG >90d15 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 9 days

discovery → filing · 15 weeks / 104 days

Jun 16, 2025

Begins

Jun 25, 2025

Discovered

Oct 7, 2025

Filed

vs. sector median

+7 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Montana State AGbd_7abe27a46b47bfef2025-10-07Candidate
Indiana State AGbd_ac18a4d13f489b542025-10-07Verified

Name: Guthmann Tax Services
norm: guthmann tax
Domain: guthmanntax.com
Industry: Financial Services

Name: Guthmann Tax Services
norm: guthmann tax
Domain: guthmanntax.com
Industry: Financial Services
Industry: Financial Servicesllm

Discovered: Jun 25, 2025
Breach occurred: Jun 16, 2025 – Jun 18, 2025
Undetected for: 9 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 7, 2025
Affected individuals: 2,826state + nationwide
Data types: Identity (basic)Government IDFinancial accountEmployment
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 ChannelT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified IRSNotified FBI and Secret ServiceWorking with state tax authorities
Initial access: valid_credentials

During the incident: Terminated the threat actor’s access
Engaged a forensic specialist to investigate the full nature and scope of this incident
Notified and began working with the Internal Revenue Service (IRS) and the appropriate state tax agencies
Reported this matter to the FBI and Secret Service
Requested additional records from our tax software provider to support the investigation
Changed our office’s EFIN with the IRS
Changes made: Implemented additional security measures to further protect our network
Installed advanced security software
Isolated affected systems
Changed login credentials across our environment
Providing access to Identity Monitoring services at no charge for 12 months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 weeks(104 days from discovery to filing)
Compliance flags: ME AG >90d · 104d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Jun 25, 2025
→ Filed with AG: Oct 7, 2025
104d 90 days ME AG >90d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Jun 25, 2025 → Filed with AG: Oct 7, 2025	104d	90 days	ME AG >90d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Montana State AGOct 7 · first

Indiana State AGOct 7 · first

Maine State AGOct 7 · first · this page

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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/5057cfa6-56ef-4259-b20e-342885eb64d0.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 7, 2025
Raw hash: cdf4e5bb74f5bf7746f8d31bbd11381abd562fbe934451ab76171b186035f557

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityGuthmann Tax Services

Victim entityGuthmann Tax Services

Incidentdiscovered Jun 25, 2025

Stated responseTerminated the threat actor’s access

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov