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%

All records for AT&T INC. →23 incidents on file

Account takeover notice

AT&T INC. notified customers of unauthorized access to their accounts. The filing says: “We have found nothing to suggest that the ID and password combinations were obtained from AT&T; they were likely obtained from another source and/ or through malware or phishing (discussed below).”

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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 filings 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
Account access: 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