HackingTelecom & MediaInformationStolen CredentialsHijackingCustomer Data InvolvedTargetedIdentity (basic)Government IDFinancial credentialsMediumContained

T-MOBILE US, INC.

bd_cf163f666a2cbf5a · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 1, 2020

Filed

Oct 13, 2020

To disclose

6 weeks

Affected

1state residents only

Linked

3 filings

Confidence

64%

Full breach record for T-MOBILE US, INC. →5 incidents on file

T-Mobile US, Inc. notified the NH AG of a breach affecting 1 NH resident. Unauthorized access occurred Aug 31-Sep 1, 2020. Actor accessed account info (name, address, phone, account #, driver's license, PIN) and attempted unauthorized line porting. T-Mobile terminated access and offered 2 years credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 1 days

discovery → filing · 6 weeks / 42 days

Aug 31, 2020

Begins

Sep 1, 2020

Discovered

Oct 13, 2020

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_8765b3040a4bc38c2020-10-09 · +4dVerified
New Hampshire State AGbd_941baa0ef105b55b2020-12-08 · +56dVerified

Name: T-MOBILE US, INC.
norm: t mobile us

Name: T-MOBILE US, INC.
norm: t mobile us
Industry: Telecom & Mediallm

Discovered: Sep 1, 2020
Breach occurred: Aug 31, 2020 – Sep 1, 2020
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Oct 9, 2020
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial credentials
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General
Initial access: valid_credentials

During the incident: T-Mobile identified this activity
Terminated the unauthorized access
Implemented measures to protect against reoccurrence
Offering two years of free credit monitoring and identity theft detection services
Changes made: Implemented measures to protect against reoccurrence
Working to further enhance security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(42 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 2 states

View merged incident ↗

Indiana State AGOct 9 · first

New Hampshire State AG+4d · this page

New Hampshire State AG+60d

Pattern: first filing Oct 9 (IN), last Dec 8 (NH) — a 60-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://mm.nh.gov/files/uploads/doj/remote-docs/t-mobile-usa-20201013.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 13, 2020
Raw hash: 00f2be54374ae2d0570c0dc4ccce7204b1b3071b8d443bef22aa490621b5da74

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityT-MOBILE US, INC.

Victim entityT-MOBILE US, INC.

Incidentdiscovered Sep 1, 2020

Stated responseT-Mobile identified this activity

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov