HackingTelecom & MediaInformationStolen CredentialsPhishingData ExfiltratedData PublishedCustomer Data InvolvedIdentity (basic)Government IDPIIHighContained

AT&T INC.

bd_9c10bf1a6486d810 · schema v1 · pii pii-v1

Severity

High

Discovered

Mar 26, 2024

Filed

Apr 9, 2024

To disclose

14 days

Affected

70,747state residents only

Linked

12 filings

Confidence

64%

Full breach record for AT&T INC. →23 incidents on file

AT&T Inc. notified Montana residents that customer information was compromised after appearing in a dataset released on the dark web on March 17, 2024. AT&T determined on March 26, 2024, that data including names, SSNs, and account details was involved. AT&T reset passcodes and offered one year of credit monitoring via Experian.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 9 days

discovery → filing · 14 days

Mar 17, 2024

Begins

Mar 26, 2024

Discovered

Apr 9, 2024

Filed

This filing is one of 12 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

South Carolina State AGbd_54dc2a4241a0af372024-04-09Candidate
California State AGbd_962bc7783c26b3452024-04-09Verified
Vermont State AGbd_ae9a0cefc958af772024-04-09Verified
Indiana State AGbd_ff7d944ebd2888c92024-04-09Verified

Show 6 more filings ↓up to 16d gap

Washington State AGbd_2c04c4a158e44fd22024-04-10 · +1dVerified
Massachusetts State AGbd_36f4d420cf6fa07e2024-04-10 · +1dVerified
Oregon State AGbd_7534be63ba9185ec2024-04-10 · +1dVerified
New Hampshire State AGbd_79d7d9a7036db0e92024-04-15 · +6dVerified
Illinois State AGbd_cf6680ffde30d0f82024-04-01 · +8dVerified
Delaware State AGbd_5109fdbae81c15502024-04-25 · +16dVerified

Showing first 10 of 11 linked disclosures.

Name: AT&T INC.
norm: at t
Domain: att.com

Name: AT&T INC.
norm: at t
Domain: att.com
Industry: Telecom & Mediallm

Discovered: Mar 26, 2024
Breach occurred: Mar 17, 2024
Undetected for: 9 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 30, 2024
Affected individuals: 70,747state-resident count only
Data types: Identity (basic)Government IDPII
Data elements: Social Security numberDate of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1566.002 Spearphishing LinkT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Initial access: valid_credentials

During the incident: Offering one year of complimentary credit monitoring, identity theft detection and resolution services provided by Experian’s® IdentityWorksSM
Reset your passcode
Launched a robust investigation supported by internal and external cybersecurity experts
Changes made: Regularly reviewing and updating the measures we take to protect your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 days(14 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 11 states

View merged incident ↗

Illinois State AGApr 1 · first

South Carolina State AG+8d

California State AG+8d

Vermont State AG+8d

Indiana State AG+8d

Montana State AG+8d · this page

Washington State AG+9d

Massachusetts State AG+9d

Oregon State AG+9d

New Hampshire State AG+14d

Delaware State AG+24d

Pattern: first filing Apr 1 (IL), last Apr 25 (DE) — a 24-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 11 — the full spread may be wider.

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-1273.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 9, 2024
Raw hash: 3d5ee206177aaab57385950c67a9f796d5c51a52ee1ac8cde946412286c5fde1

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityAT&T INC.

Victim entityAT&T INC.

Incidentdiscovered Mar 26, 2024

Stated responseOffering one year of complimentary credit monitoring, identity theft detection and resolution services provided by Experian’s® IdentityWorksSM

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov