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Cyber Threat
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Ransomware victim Public Sector

Ayuntamiento de Valdemoro

Listed by Kairos on · organisation based in Spain

valdemoro.es

Disclosed
May 11, 2026
Leak-site listing date
Threat group
Kairos
107 victims listed
Country
Spain
#9 most targeted
Sector
Public Sector

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Kairos. Figures and technique mappings are quoted from the source data, not inferred.

About the Kairos group

Kairos is a data extortion group active since late 2024 that focuses solely on data theft with no encryption, primarily targeting small-to-mid-sized organizations in healthcare, manufacturing, and business services in the US, purchasing initial access from brokers and demanding Bitcoin payments. Kairos has listed 100 victims since June 2024.

Incident analysis

Ayuntamiento de Valdemoro was listed by Kairos ransomware, a group with 107 victims recorded in this database. The listing appeared on the group's leak site on May 11, 2026.

Ayuntamiento de Valdemoro is based in Spain and operates in the Public Sector sector. Spain ranks #9 worldwide for ransomware disclosures, with 482 victims in this database.

Sector context. Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Kairos typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was Ayuntamiento de Valdemoro attacked by ransomware?

Yes. Ayuntamiento de Valdemoro was listed as a victim of the Kairos ransomware group on May 11, 2026. The organisation is based in Spain and operates in the Public Sector sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Ayuntamiento de Valdemoro?

Ayuntamiento de Valdemoro was attacked by Kairos ransomware. Kairos is one of the most active ransomware groups, having claimed 107 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Ayuntamiento de Valdemoro ransomware attack occur?

The ransomware attack on Ayuntamiento de Valdemoro was disclosed on May 11, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Ayuntamiento de Valdemoro ransomware attack?

The specific data stolen from Ayuntamiento de Valdemoro has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Public Sector organisation, Ayuntamiento de Valdemoro likely held sensitive business data, client information, and operational records.

How can organisations protect against Kairos attacks?

To defend against Kairos and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.