Was Ayuntamiento de Valdemoro hit by ransomware?

Ayuntamiento de Valdemoro was listed by the Kairos ransomware operation (Spain), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Kairos ransomware group?

Kairos is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Ayuntamiento de Valdemoro breach?

Kairos published data attributed to Ayuntamiento de Valdemoro. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Ayuntamiento de Valdemoro

Claimed by Kairos · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedMay 11, 2026
Data leakeddate unknown

At a glance

Group: Kairos
Status: Data leaked
Country: Spain
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 2 months 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.

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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 88 public disclosures across our corpus. First observed on a leak site on November 13, 2024; most recent post June 1, 2026. The operation is currently active.

Timeline of this disclosure

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

Other recent disclosures by Kairos

Kairos has been linked to 88 public victims on Darkfield. A sample of the most recent:

See the full Kairos dossier →

Sector and geography

This disclosure adds to ransomware activity in the Public Sector sector, which has 466 disclosures indexed across all operators we track. Geographically, Ayuntamiento de Valdemoro is reported in Spain, a country with 128 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Kairos means Ayuntamiento de Valdemoro appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, INCIBE-CERT (Spain), as required for your jurisdiction.
Monitor for the data appearing on Kairos's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.