HackingTechnologyInformationStolen CredentialsCustomer Data InvolvedData ExfiltratedIdentity (basic)Government IDHighActive

EXPERIAN SERVICES CORP.

bd_57db43eea6b6d9f2 · schema v1 · pii pii-v1

Severity

High

Discovered

Sep 15, 2015

Filed

Oct 8, 2015

To disclose

23 days

Affected

22,365state residents only

Confidence

66%

Full breach record for EXPERIAN SERVICES CORP. →28 incidents on file

Experian notifies NH AG of supplemental breach affecting 22,365 T-Mobile customers. Unauthorized party accessed Experian servers on Sept 15, 2015, downloading PII including SSNs and driver's licenses. Notifications mailed Oct 6, 2015. Credit monitoring offered.

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Incident timeline

discovery → filing · 23 days

Sep 15, 2015

Discovered

Oct 8, 2015

Filed

vs. sector median

15 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed22,365 affectedView incident

Name: Perkins Coie LLP (on behalf of Experian)
norm: perkins coie llp on behalf of experian

Name: EXPERIAN SERVICES CORP.
norm: experian services
Industry: Technologyllm

Discovered: Sep 15, 2015
Materiality determined: —
Notification sent: Oct 6, 2015
Affected individuals: 22,365state-resident count only
Data types: Identity (basic)Government ID
Data elements: Date of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General's Office
Third party: via T-Mobile USA, Inc.
Initial access: valid_credentials

During the incident: Notified appropriate federal, state and international law enforcement agencies
Took additional security steps to help prevent future incidents
Offering a complimentary two-year membership in ProtectMyID Elite credit monitoring and identity theft resolution services
Changes made: Implemented additional security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 23 days(23 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/experian-t-mobile-20151008.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 8, 2015
Raw hash: 94c381e638e82b86c720f1108ebe9103e4fcbd0dfccd6e019a062ff6d0c455c7

Reporting entityPerkins Coie LLP (on behalf of Experian)

Victim entityEXPERIAN SERVICES CORP.

Incidentdiscovered Sep 15, 2015

Stated responseNotified appropriate federal, state and international law enforcement agencies

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov