MalwareHealthcareHealthcareRansomwareCapture Stored DataData ExfiltratedData EncryptedIdentity (basic)PIILowContained

SIERRA TUCSON, LLC

bd_fdd7a8aa73775bab · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 13, 2020

Filed

May 10, 2021

To disclose

21 weeks

Affected

1state residents only

Linked

2 filings

Confidence

66%

Full breach record for SIERRA TUCSON, LLC →

Sierra Tucson, LLC notified Montana residents of a December 13, 2020 incident where an unauthorized party gained access to its network and deployed malware. The breach potentially exposed names, addresses, dates of birth, and other personal information from inquiry documents. Sierra Tucson engaged forensic investigators, secured the network, and offered one year of Experian IdentityWorks credit monitoring to affected individuals.

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Incident timeline

discovery → filing · 21 weeks / 148 days

Dec 13, 2020

Begins

Dec 13, 2020

Discovered

May 10, 2021

Filed

vs. sector median

+10 wks slower

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

Illinois State AGbd_0960c68d7dfed98a2021-01-01 · +129dCandidate

Name: SIERRA TUCSON, LLC
norm: sierra tucson

Name: SIERRA TUCSON, LLC
norm: sierra tucson
Industry: Healthcarellm

Discovered: Dec 13, 2020
Breach occurred: Dec 13, 2020
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 1state-resident count only
Data types: Identity (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1119 Automated Collection
Threat actor: ExternalFinancial

During the incident: Took steps to secure the network
Began an investigation with the assistance of a computer forensic firm
Offering you a complimentary one-year membership of Experian IdentityWorks SM Credit 3B
Continuing to regularly audit our systems for potential unauthorized activity
Implemented enhanced network monitoring tools
Changes made: Implemented enhanced network monitoring tools
Continuing to regularly audit our systems for potential unauthorized activity
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 weeks(148 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 ↗

Illinois State AGJan 1 · first

Montana State AG+129d · this page

Pattern: first filing Jan 1 (IL), last May 10 (MT) — a 129-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/Sierra-Notif.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 10, 2021
Raw hash: 83bb0eda29ba74ee1d268e44ae6633f3da163b2353f280d3a5ff5517823146b4

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entitySIERRA TUCSON, LLC

Victim entitySIERRA TUCSON, LLC

Incidentdiscovered Dec 13, 2020

Stated responseTook steps to secure the network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov