HackingGovernmentGovernmentCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)Financial accountBiometricMediumContained

Sierra County, CA

bd_857ee1ceedfe9e02 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 5, 2023

Filed

Nov 21, 2023

To disclose

37 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

66%

Full breach record for Sierra County, CA →

Sierra County experienced a sophisticated cybersecurity attack on February 21, 2023, discovered on March 5, 2023. The incident potentially impacted personally identifiable information including names, addresses, SSNs, driver's license numbers, health information, financial account numbers, and biometric data. The County secured systems, engaged third-party experts, and offered 12 months of credit monitoring and identity restoration services via Experian. No evidence of fraud or identity theft was found.

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Incident timeline

undetected · 12 days

discovery → filing · 37 weeks / 261 days

Feb 21, 2023

Begins

Mar 5, 2023

Discovered

Nov 21, 2023

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

Montana State AGbd_607449c086eba0152023-11-22 · +1dVerified

Name: Sierra County, CA
norm: sierra county ca

Name: Sierra County, CA
norm: sierra county ca
Industry: Governmentllm

Discovered: Mar 5, 2023
Breach occurred: Feb 21, 2023
Undetected for: 12 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDHealth (basic)Financial accountBiometric
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
Threat actor: External

During the incident: Took immediate steps to secure its systems
Conducted an extensive investigation into the nature and scope of the Incident with assistance from third-party experts
Arranged for Experian to provide 12 months of free credit monitoring services, identity restoration, and identity theft insurance
Changes made: Reviewed our cybersecurity environment and taken reasonable steps to augment it to reduce the risk of a future event
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 37 weeks(261 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 ↗

California State AGNov 21 · first · this page

Montana State AG+1d

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://oag.ca.gov/ecrime/databreach/reports/sb24-576895
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 21, 2023
Raw hash: 05d6d2ecd9dbccc34634e3e44cfe5e16d6082d15fba01967837027a44693279d

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entitySierra County, CA

Victim entitySierra County, CA

Incidentdiscovered Mar 5, 2023

Stated responseTook immediate steps to secure its systems

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov