HackingTelecom & MediaInformationStolen CredentialsPhishingCustomer Data InvolvedTargetedGovernment IDCredentialsMediumContained

AT&T INC.

bd_154f5cf05e912da1 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 5, 2017

Filed

May 19, 2017

To disclose

14 days

Affected

78state residents only

Linked

3 filings

Confidence

66%

Full breach record for AT&T INC. →19 incidents on file

AT&T notified the New Hampshire Attorney General of a breach affecting 78 NH residents. Unauthorized parties likely obtained customer credentials via malware or phishing, accessing online accounts between Jan 25 and Apr 20, 2017. Driver's license numbers were visible on a single page within accounts. AT&T locked affected accounts, removed license visibility, and offered one year of credit monitoring and identity restoration services.

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Incident timeline

undetected · 100 days

discovery → filing · 14 days

Jan 25, 2017

Begins

May 5, 2017

Discovered

May 19, 2017

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

Montana State AGbd_3a02a71ddd82b01f2017-05-19Candidate
Massachusetts State AGbd_96ee6b72561f718c2017-05-19Verified

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

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

Discovered: May 5, 2017
Breach occurred: Jan 25, 2017 – Apr 20, 2017
Undetected for: 100 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 22, 2017
Affected individuals: 78state-resident count only
Data types: Government IDCredentials
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1078 Valid AccountsT1566 Phishing
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Office of the Attorney General
Initial access: valid_credentials

During the incident: Locked online access to all known impacted accounts
Assured that drivers' license numbers are no longer displayed in AT&T online accounts
Offer credit and other monitoring, insurance and identity restoration services to all potentially impacted customers
Mailed notification letters to each of them on Monday, May 22nd
Changes made: Offering one year of free credit monitoring with CSID
Offering access to credit report with CSID
Offering ID Theft Insurance of up to $1,000,000
Offering Identity Restoration services
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 · 3 filings · 3 states

View merged incident ↗

Montana State AGMay 19 · first

Massachusetts State AGMay 19 · first

New Hampshire State AGMay 19 · 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://mm.nh.gov/files/uploads/doj/remote-docs/att-20170519.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 19, 2017
Raw hash: 5e149c49b64fa8ebaee2b3ecaff7a9b129a617fa3f8b7aec50eed6c12c455b34

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityAT&T INC.

Victim entityAT&T INC.

Incidentdiscovered May 5, 2017

Stated responseLocked online access to all known impacted accounts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov