MalwareTelecom & MediaInformationRansomwareVulnerability ExploitRansom DemandedData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDHighContained

Duo Broadband

bd_aa25a3c747474b68 · schema v1 · pii pii-v1

Severity

High

Discovered

Mar 17, 2025

Filed

May 15, 2025

To disclose

8 weeks

Affected · nationwide

42,5185 in this filing

Linked

3 filings

Confidence

66%

Full breach record for Duo Broadband →

Duo Broadband (Duo County Telephone Cooperative and Cumberland Cellular) reported an external system breach on Feb 13, 2025, where a threat actor attempted to deploy ransomware and solicit payment. Unauthorized access to customer PII (names, addresses, DOBs, SSNs) was confirmed on March 17, 2025. 42,518 individuals were affected, including 5 Maine residents. Notices were sent May 15, 2025, offering 12 months of Kroll identity monitoring.

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Maine clockDiscovered Mar 17, 2025 → Filed with AG May 15, 202559d ⏱ ME AG >30d8 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 32 days

discovery → filing · 8 weeks / 59 days

Feb 13, 2025

Begins

Mar 17, 2025

Discovered

May 15, 2025

Filed

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

Indiana State AGbd_1f4bbfe1afc888a52025-05-15Candidate
New Hampshire State AGbd_87fe4f1545c4e6e12025-05-15Verified

Name: Duo County Telephone Cooperative Corporation, Inc. and Cumberland Cellular, LLC
norm: duo county telephone cooperative cumberland cellular

Name: Duo Broadband
norm: duo broadband
Industry: Telecom & Mediallm

Discovered: Mar 17, 2025
Breach occurred: Feb 13, 2025
Undetected for: 32 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 15, 2025
Affected individuals: 42,518state + nationwide
Data types: Identity (basic)Government ID
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Notified law enforcement as required by federal regulations
Initial access: exploit_public_facing

During the incident: Took action to secure systems
Terminated unauthorized access
Notified law enforcement
Engaged Kroll to provide identity monitoring
Changes made: Implemented enhanced security measures
Reinforced access controls
Conducted comprehensive security review
Reevaluated third-party vendor management processes
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(59 days from discovery to filing)
Compliance flags: ME AG >30d · 59d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Mar 17, 2025
→ Filed with AG: May 15, 2025
59d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Mar 17, 2025 → Filed with AG: May 15, 2025	59d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Indiana State AGMay 15 · first

New Hampshire State AGMay 15 · first

Maine State AGMay 15 · 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-a1252b4f8318/943d1111-7f57-42a2-8259-b0de8e4ba981.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 15, 2025
Raw hash: 2b90a26f3b8fa3537adfd207cdbd327f9b8f3c2aa25d9e3dcfceff2c11bb8aca

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityDuo County Telephone Cooperative Corporation, Inc. and Cumberland Cellular, LLC

Victim entityDuo Broadband

Incidentdiscovered Mar 17, 2025

Stated responseTook action to secure systems

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov