Disclosure context

About kairos

Kairos is a recently emerged ransomware group first observed in November 2024 that appears to be primarily financially motivated, having targeted approximately 75 victims across multiple sectors and countries. The group's origin and potential affiliations remain unclear due to limited public documentation from established threat intelligence sources, and it is unknown whether they operate as a Ransomware-as-a-Service model or as an independent entity. Based on available targeting data, Kairos appears to focus their operations primarily on English-speaking countries including the United States, Australia, United Kingdom, and Canada, with additional activity observed in Germany, while their sector targeting spans education, healthcare, agriculture and food production, and business services, though specific attack methodologies, initial access vectors, and encryption techniques have not been publicly documented by major security organizations. Given the group's recent emergence in late 2024, there are no widely reported notable campaigns or high-profile incidents documented by CISA, FBI, or established security research firms. As of current reporting, Kairos appears to remain active based on their recent first observation date, though comprehensive threat intelligence profiles from major security organizations have not yet been published due to the group's nascent operational timeline. The group has been linked to 86 public disclosures across our corpus. First observed on a leak site on November 13, 2024; most recent post May 15, 2026. The operation is currently active.

Timeline of this disclosure

May 11, 2026Ayuntamiento de Valdemoro listed by kairoson the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Public Sector sector, which has 259 disclosures indexed across all operators we track. Geographically, Ayuntamiento de Valdemoro is reported in ES, a country with 116 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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Ayuntamiento de Valdemoro

Claimed by kairos · listed 9 days ago

Age

since listed · data leaked

Status timeline

Listed
May 11, 2026
Data leaked

At a glance

Group: kairos
Status: Data leaked
Country: ES
Sector: Public Sector
Listed on leak site: May 11, 2026

About the victim

AI dossier — public-source company profile

Ayuntamiento de Valdemoro is the municipal government of Valdemoro, a town in the Madrid region of Spain. It is responsible for local public services including urban maintenance, social and cultural programmes, education and sports facilities, and citizen support. The council manages municipal assets, passes local regulations, and administers day-to-day public administration for the municipality through its official portal valdemoro.es.

Industry: Local Government / Municipal Administration
Address: Valdemoro, Community of Madrid, Spain

Attack summary

Severity: high — Data has been confirmed as published by the threat actor, meaning exfiltration of government/public sector data is established. Municipal governments hold citizen PII, administrative records, and sensitive local government data, raising the severity to high; insufficient evidence of large-scale regulated PII (e.g. medical or financial at scale) to classify as critical.

The Kairos ransomware group claims to have attacked the Ayuntamiento de Valdemoro and has published data (disclosed status: data_published), indicating exfiltration of municipal government data. No specific ransom amount or data volume was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Municipal administrative records
Citizen support data
Local government documentation
Urban planning and maintenance records
Social and cultural programme data

What the group claims

Ayuntamiento de Valdemoro is the municipal government of Valdemoro, a town in the Madrid region of Spain. The site valdemoro.es is its official portal for residents, local news, and access to administrative services. The council plans and delivers local public services such as urban maintenance, social and cultural programmes, education and sports facilities where it is responsible, and citizen support. It passes local regulations within national and regional law, manages municipal assets, and interacts with higher tiers of government on regional and national programmes. In short, it is the local authority that governs and runs day-to-day public administration for the municipality.

Source

Indexed 9 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.