Social EngineeringProfessional ServicesProfessional ServicesPhishingStolen CredentialsCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

ML & CO Accounting Services, LLC

bd_02989f274611bb2c · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 11, 2023

Filed

Dec 21, 2023

To disclose

10 days

Affected

4state residents only

Linked

2 filings

Confidence

66%

Full breach record for ML & CO Accounting Services, LLC →

ML & CO Accounting Services, LLC notified Montana residents that an unauthorized individual accessed employee email accounts containing PII (names, SSNs, bank account/routing numbers) between June 22 and July 18, 2023. The incident was discovered on December 11, 2023. The company engaged external cybersecurity professionals, secured the email environment, and offered 12 months of credit monitoring.

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Incident timeline

undetected · 172 days

discovery → filing · 10 days

Jun 22, 2023

Begins

Dec 11, 2023

Discovered

Dec 21, 2023

Filed

vs. sector median

18 wks faster

This filing is one of 2 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_2bc91ec9fa5996302023-12-21Verified

Name: ML & CO Accounting Services, LLC
norm: ml co accounting

Name: ML & CO Accounting Services, LLC
norm: ml co accounting
Industry: Professional Servicesllm

Discovered: Dec 11, 2023
Breach occurred: Jun 22, 2023 – Jul 18, 2023
Undetected for: 172 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 4state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Disabled all unauthorized access to our email environment
Commenced a prompt and thorough investigation
Working very closely with external cyber security professionals
Providing you with access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge
Providing proactive fraud assistance
Updating passwords and enhancing email access protocols
Changes made: Updating passwords and enhancing email access protocols
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.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGDec 21 · first

Montana State AGDec 21 · 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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-968.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 21, 2023
Raw hash: 12476ee4e2bf85e91cfa4486cf6b4b2e26e5d2e03e466a33656bb3bd1eb06fd5

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityML & CO Accounting Services, LLC

Victim entityML & CO Accounting Services, LLC

Incidentdiscovered Dec 11, 2023

Stated responseDisabled all unauthorized access to our email environment

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov