HackingTechnologyTelecom & MediaInformationStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDPIICriticalActive

Experian North America

bd_4acd7ab8e9482cae · schema v1 · pii pii-v1

Severity

Critical

Discovered

Sep 15, 2015

Filed

Oct 1, 2015

To disclose

16 days

Affected

328,889state residents only

Linked

3 filings

Confidence

69%

Full breach record for Experian North America →3 incidents on file

Experian, a third-party vendor for T-Mobile USA, Inc., experienced unauthorized access to systems on September 15, 2015. The intruder accessed PII of approximately 328,889 Washington residents who applied for T-Mobile service, including names, SSNs, DOBs, and driver's license numbers. T-Mobile notified Experian on September 21, 2015. Law enforcement was notified, and credit monitoring services were offered to affected individuals.

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Incident timeline

discovery → filing · 16 days

Sep 15, 2015

Begins

Sep 15, 2015

Discovered

Oct 1, 2015

Filed

vs. sector median

16 wks faster

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_adff277577bf9c912015-10-01Verified
Oregon State AGbd_9ec2e9674ac7b1422015-10-30 · +29dVerified

Name: T-MOBILE USA, INC.
norm: t mobile usa
Domain: t-mobile.com

Name: Experian North America
norm: experian north america
Domain: experian.com
Industry: TechnologyllmTelecom & Mediallm

Discovered: Sep 15, 2015
Breach occurred: Sep 15, 2015
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 8, 2015
Affected individuals: 328,889state-resident count only
Data types: Identity (basic)Government IDPII
Data elements: Passport numberMilitary ID numberDate of birthDriver's licence numberSocial Security numberName
WA-stated cause: Unauthorized Access
WA-stated duration: lifecycle Unknowndexposure Unknownd
WA-stated discovery: Found after the fact
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified Washington Attorney General's Office
Initial access: valid_credentials

During the incident: Experian has notified appropriate federal, state and international law enforcement agencies
Experian is mailing notification letters to affected individuals
Experian is notifying impacted individuals through a public website and notices in statewide media
Experian has taken additional security steps to help prevent future incidents
Changes made: Offering a complimentary two-year membership in ProtectMyID Elite credit monitoring and identity theft resolution services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 16 days(16 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 · 3 states

View merged incident ↗

Indiana State AGOct 1 · first

Washington State AGOct 1 · first · this page

Oregon State AG+29d

Pattern: first filing Oct 1 (IN), last Oct 30 (OR) — a 29-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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM9591.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 1, 2015
Raw hash: 0d0b2ab76efbf649845cfcdb4c22ccd8affce357af782b63b4737b2555f5184c

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityT-MOBILE USA, INC.

Victim entityExperian North America

Incidentdiscovered Sep 15, 2015

Stated responseExperian has notified appropriate federal, state and international law enforcement agencies

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com