Social EngineeringTelecom & MediaInformationPhishingStolen CredentialsCustomer Data InvolvedTargetedGovernment IDCredentialsMediumContained

AT&T INC.

bd_3a02a71ddd82b01f · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

May 19, 2017

To disclose

—

Affected

50state residents only

Linked

3 filings

Confidence

66%

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

AT&T notified Montana residents of unauthorized access to online accounts between Jan 25 and Apr 20, 2017. Attackers used stolen credentials, likely obtained via phishing, to view driver's license numbers. AT&T locked accounts and offered credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

Jan 25, 2017

Begins

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

New Hampshire State AGbd_154f5cf05e912da12017-05-19Verified
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: —
Breach occurred: Jan 25, 2017 – Apr 20, 2017
Materiality determined: —
Notification sent: —
Affected individuals: 50state-resident count only
Data types: Government IDCredentials
Data elements: Social Security number
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Moved quickly to block the unauthorized activity
Locked online Access ID
Offering one year of free credit monitoring with CSID
Changes made: Reset password online
Add extra security passcode to account
Source: Quoted from the filing itself, not independently verified.

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 ↗

New Hampshire State AGMay 19 · first

Massachusetts State AGMay 19 · first

Montana 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://dojmt.gov/wp-content/uploads/ATT.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: 35f466937e4aa1fdc0f9774b4e15ad48d61b9ace5f0cadff44493de89eed1234

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityAT&T INC.

Victim entityAT&T INC.

IncidentPhishing

Stated responseMoved quickly to block the unauthorized activity

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov