MalwareTechnologyInformationRansomwareData EncryptedIdentity (basic)Government IDMediumContained

Terillium

bd_ddf38a5f78725dc4 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jul 18, 2025

Filed

Oct 24, 2025

To disclose

14 weeks

Affected

3state residents only

Linked

5 filings

Confidence

66%

Full breach record for Terillium →

Terillium notified Montana residents of a ransomware attack detected on July 18, 2025. The incident compromised employee PII, including names, addresses, and SSNs. The attack was contained by July 19, 2025, with no evidence of data misuse. Terillium engaged cybersecurity experts and restored server functionality.

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Incident timeline

discovery → filing · 14 weeks / 98 days

Jul 18, 2025

Begins

Jul 18, 2025

Discovered

Oct 24, 2025

Filed

vs. sector median

4 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Siteplaybd_3d291380eaf454b52025-07-18 · +98dVerified by operator

Regulatory filings (3) · sorted by filing gap

Indiana State AGbd_653cf810dc1efd1e2025-10-24Verified by operator
New Hampshire State AGbd_af8682d60e587a762025-10-24Verified
Massachusetts State AGbd_f0b8d00a669e81cf2025-11-11 · +18dVerified by operator

Name: Terillium
norm: terillium
Domain: terillium.com

Name: Terillium
norm: terillium
Domain: terillium.com
Industry: Technologyllm

Discovered: Jul 18, 2025
Breach occurred: Jul 18, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 3state-resident count only
Data types: Identity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial

During the incident: Engaged cybersecurity experts to investigate the incident
Contained the attack
Restored functionality to all affected servers
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 weeks(98 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGOct 24 · first

New Hampshire State AGOct 24 · first

Montana State AGOct 24 · first · this page

Massachusetts State AG+18d

Pattern: first filing Oct 24 (IN), last Nov 11 (MA) — a 18-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/2025/10/Consumer-notification-letter-31.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 24, 2025
Raw hash: edece13f88d843711413a5b15181990a157f88741b80ca45848ecb709a18681f

Linked disclosures

Ransomware claims (1)

Regulatory filings (3) · sorted by filing gap

Reporting entityTerillium

Victim entityTerillium

Incidentdiscovered Jul 18, 2025

Stated responseEngaged cybersecurity experts to investigate the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov