Social EngineeringTelecom & MediaInformationPhishingStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Government IDMediumContained

CenturyLink

bd_df381037acd1f901 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 1, 2017

Filed

Feb 20, 2017

To disclose

19 days

Affected

26state residents only

Linked

3 filings

Confidence

66%

Full breach record for CenturyLink →2 incidents on file

CenturyLink notified Montana employees that an email account was compromised via phishing on or around Jan 30, 2017. Detected Feb 1, 2017. Exposed PII including names, addresses, SSNs, and DOBs. No financial data involved. CenturyLink stopped spam, offered 1-year Experian ProtectMyID, and provided security training.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 2 days

discovery → filing · 19 days

Jan 30, 2017

Begins

Feb 1, 2017

Discovered

Feb 20, 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_ba14629d7b30e8582017-02-24 · +4dVerified
Massachusetts State AGbd_fe5852acfd71dca12017-02-28 · +8dVerified

Name: CenturyLink
norm: centurylink
Domain: centurylink.com

Name: CenturyLink
norm: centurylink
Domain: centurylink.com
Industry: Telecom & Mediallm

Discovered: Feb 1, 2017
Breach occurred: Jan 30, 2017
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 28, 2017
Affected individuals: 26state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1114 Email Collection
Threat actor: External
Initial access: phishing_link

During the incident: Stopped the SPAM
Providing additional training
Examining procedures to minimize the risk of reoccurrence
Offering a complimentary one-year membership in Experian’s ProtectMyID Alert
Changes made: Providing additional training
Examining procedures to minimize the risk of reoccurrence
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 19 days(19 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 AGFeb 20 · first · this page

New Hampshire State AG+4d

Massachusetts State AG+8d

Pattern: first filing Feb 20 (MT), last Feb 28 (MA) — a 8-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://dojmt.gov/wp-content/uploads/CenturyLink.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 20, 2017
Raw hash: 8260d06af05b6855b130739a34eff730f69179f6ffb6e455b93c0f32562b331d

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityCenturyLink

Victim entityCenturyLink

Incidentdiscovered Feb 1, 2017

Stated responseStopped the SPAM

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov