Threat reportRansomwareTL-2026-2898
Kairos Data-Extortion Group Claims Slate Valley Unified School District (Vermont); 762 GB Claimed, Board Declines Ransom, Leak Imminent
Kairos Data-Extortion Group Claims Slate Valley Unified (TL-2026-2898) is a high-severity ransomware operation, first published 2026-10-04. It is attributed to Kairos with medium confidence, affects Slate Valley Unified School District District student, HR and payroll, maps to 5 MITRE ATT&CK techniques (T1005, T1078, T1110.001), and is covered by 9 detection rules and 12 indicators of compromise.
- Severity
- HIGHAssessed severity
- CVEs
- 0None referenced
- Techniques
- 5MITRE ATT&CK
- Actors
- 1Kairos
- Detection rules
- 9SPL · KQL · Sigma
- IOCs
- 12Indicators of compromise
Key facts for TL-2026-2898
- Threat ID
- TL-2026-2898
- Severity
- HIGH
- Status
- ACTIVE
- Category
- RANSOMWARE
- First published
- Last reviewed
- Attribution
- Kairos
- Attribution confidence
- MEDIUM
- Motivation
- FINANCIAL
- Target sectors
- education, government administration, health
- Target regions
- North America
- Detection rules
- 9
- Indicators of compromise
- 12
Malware and tooling in Kairos Data-Extortion Group Claims Slate Valley Unified
Malware and tooling: kairos
How Kairos Data-Extortion Group Claims Slate Valley Unified works
Slate Valley Unified School District (Fair Haven, Vermont) suffered a cyber incident beginning 2026-09-03. The Kairos group lists the district on its leak site claiming 762 GB (647 GB of SQL databases); the school board voted on 2026-09-29 not to pay and a countdown timer indicates publication is imminent.
Slate Valley Unified School District (SVUUSD), Fair Haven, Vermont, reported a ransomware/cyber incident that began on 2026-09-03. According to DataBreaches.net (2026-10-04), the Kairos group listed the district on its dark web leak site claiming 762 GB of exfiltrated data, of which 647 GB are SQL databases containing personal and medical information. The school board voted on 2026-09-29 not to pay the ransom; the ransom demand was announced to media on 2026-10-02 and a countdown on the listing points to a leak around 2026-10-05. The ransom amount is not stated in the source.
Data described as exposed in the leak-site listing/sample material includes: student names, dates of birth, parents' names, home addresses and phone numbers, special education status (IEPs) and placement notes (April-June 2026), Medicaid billing references for special education students and FERPA-protected placement dispute files; a 7/13/2026 spreadsheet covering 329 employees (names, DOBs, full Social Security numbers, marital status, salaries, job class, hire dates, addresses, phone numbers, emails); and 466 spouse/dependent records with names, DOBs and SSNs. Superintendent Brooke Olsen-Farrell told the Rutland Herald the district is 'not in a position to confirm that student (data) was not compromised'.
Attribution and TTP context (from independent reporting on Kairos, NOT from the Slate Valley source): Kairos first surfaced on 2024-11-13 with a Tor leak site and is repeatedly described as a data-theft-only extortion operation that has never been confirmed to deploy encryption. Cyjax reports a 7-day deadline with a 20% discount for payment within 5 days, Bitcoin payment, and a promise of deletion within 24 hours of payment. In the Union County, Ohio case (May-June 2025) the group reportedly gained access through brute-forcing a single guessed password, exfiltrated ~2 TB / 1.6M files and was paid ~$1M after a $3M opening demand. A likely backend server (62.182.81.38, Virtual Systems LLC, Ukraine, ASN 209605) was reported seized by Ukraine's SBU Cyber Department in January 2026 and the original leak site reported down, yet new victim listings (including this one in September 2026) indicate the operation continues or has been rebuilt; this discrepancy is unresolved in the sources.
Caveats: the Slate Valley incident rests on a single source (DataBreaches.net); no CVE, initial-access vector, malware, or IOC specific to this incident has been published, and encryption is not confirmed. Technique mappings below are drawn from the group's documented behavior and the claimed data theft, not from forensic findings at the district. BeaconBeagle returned no usable result (HTTP 404) for 62.182.81.38.
MITRE ATT&CK techniques used in TL-2026-2898
Collection
T1005 Data from Local System; T1213 Data from Information Repositories
Initial Access
Credential Access
T1110.001 Brute Force: Password Guessing
Impact
Affected products and versions in Kairos Data-Extortion Group Claims Slate Valley Unified
- Slate Valley Unified School District — District student, HR and payroll data systems (SQL databases)
Vulnerable versions: Not disclosed
Remediation for Kairos Data-Extortion Group Claims Slate Valley Unified
Immediate actions
- Notify affected students, parents, employees and dependents; offer credit monitoring/identity protection to those whose SSNs were exposed
- Monitor the Kairos leak site and dark web for publication of district data and assess exposure of student special-education and Medicaid billing records
- Reset credentials and enforce MFA on all district accounts, VPN, email and remote-access services; hunt for password-guessing/brute-force activity
Workarounds
- No CVE is associated with this incident; apply standard identity hardening and egress monitoring
Longer-term hardening
- Segment and restrict access to student information and HR/payroll SQL databases; alert on bulk database reads and large outbound transfers
- Maintain tested offline backups and an incident response and breach-notification plan covering FERPA, state breach laws and HIPAA/Medicaid obligations
- Adopt account-lockout, password-spraying detection and phishing-resistant MFA for staff
Weaknesses (CWE) in Kairos Data-Extortion Group Claims Slate Valley Unified
Timeline of Kairos Data-Extortion Group Claims Slate Valley Unified
- Kairos data-leak site emerges with its first six claimed victims (Cyjax); data-theft-only extortion with Bitcoin demand and 7-day deadline.
- Union County, Ohio listed on the Kairos leak site after network access between 2025-05-06 and 2025-05-18 via a brute-forced password; ~2 TB claimed.
- Union County, Ohio reportedly pays ~$1M in Bitcoin to Kairos after a $3M opening demand (Security Affairs, SecurityWeek).
- Likely Kairos leak-site backend (62.182.81.38, Virtual Systems LLC, Ukraine) reported showing a Ukrainian SBU Cyber Department seizure notice (January 2026, month-level date).
- Kairos announces Strata Republic (Australia, 441 GB) on its leak site, showing continued activity after the reported seizure (Cyber Daily).
- Cyber incident begins at Slate Valley Unified School District, Fair Haven, Vermont.
- School board votes not to pay the ransom demand.
- Ransom demand and Kairos leak-site listing (762 GB claimed, 647 GB SQL databases) become public via media reporting.
- DataBreaches.net reports the district is listed by Kairos and data is likely to be leaked.
- Countdown on the Kairos listing points to publication of the data around this date.
Sources cited for Kairos Data-Extortion Group Claims Slate Valley Unified
- Slate Valley Unified School District voted not to pay ransom demand; Kairos likely to leak data (DataBreaches.net)
- An elephant in Kairos: data-leak site emerges for new extortion group (Cyjax)
- U.S. Government Agency Paid $1M to Data Extortion Group Kairos (Security Affairs)
- County government reportedly paid $1 million to cyber extortion group (SecurityWeek)
- Union County, Ohio Government Pays $1 Million Bitcoin Ransom to Kairos After Data-Only Attack (Rescana)
- NSW-based Strata Republic allegedly breached by Kairos ransomware group (Cyber Daily)
- Kairos Ransomware Strikes Trico School District (DeXpose)
- Kairos ransomware: why extortion defense must go beyond encryption (Hexnode)
Detection coverage for TL-2026-2898
As of 2026-10-04, Threadlinqs Intelligence publishes 9 detection rule(s) for TL-2026-2898 across Splunk SPL, Microsoft KQL and Sigma, covering 12 indicator(s) of compromise. The whole corpus is readable without an account; a free account unlocks full detection query text in Splunk SPL, Microsoft KQL and Sigma; paid tiers add raw indicator values, correlation and the MCP server. Threadlinqs MCP server · View plans.
Community OSINT corroboration for TL-2026-2898
1 of this threat's indicators have also been reported by the open-source security community, which observed at least one of them before this report was published. Community sightings are unverified and are kept separate from Threadlinqs' curated indicators. Indicator values, reporters and campaign linkage are available to authenticated Red-tier users.