Social EngineeringGovernmentGovernmentPhishingTargetedIdentity (basic)Government IDMediumContained

Lincoln County, South Dakota

bd_6a508f9bff1d22f1 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 19, 2020

Filed

Mar 19, 2020

To disclose

29 days

Affected

1state residents only

Linked

2 filings

Confidence

66%

Full breach record for Lincoln County, South Dakota →

Lincoln County, SD notified Montana residents of a phishing incident on Sept 3, 2019 that compromised an employee email account containing names, SSNs, and driver's licenses. Forensic investigation confirmed on Feb 19, 2020. No evidence of misuse. Offered 1-year credit monitoring via TransUnion.

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Incident timeline

undetected · 169 days

discovery → filing · 29 days

Sep 3, 2019

Begins

Feb 19, 2020

Discovered

Mar 19, 2020

Filed

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Indiana State AGbd_9955acece4f36d602020-03-19Verified

Name: Lincoln County, South Dakota
norm: lincoln county south dakota

Name: Lincoln County, South Dakota
norm: lincoln county south dakota
Industry: Governmentllm

Discovered: Feb 19, 2020
Breach occurred: Sep 3, 2019
Undetected for: 169 daysoccurrence → discovery
Materiality determined: —
Notification sent: Mar 19, 2020
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: External
Initial access: phishing_link

During the incident: Secured the account
Commenced a prompt and thorough investigation
Worked very closely with external cybersecurity professionals
Conducted an extensive forensic investigation
Offering a one-year membership in myTrueIdentity provided by TransUnion Interactive
Changes made: Continually evaluate and modify practices to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 29 days(29 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Indiana State AGMar 19 · first

Montana State AGMar 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/doc-30.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 19, 2020
Raw hash: 6a78745912804e005dc396672d7a10ceb3d33a79fb6bdc77957eacd5e8d844b6

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityLincoln County, South Dakota

Victim entityLincoln County, South Dakota

Incidentdiscovered Feb 19, 2020

Stated responseSecured the account

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov