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Cyber Threat
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Ransomware victim Business Services

BUROTEC S.A.

Listed by Blacklock on · organisation based in Spain

burotec.biz

Disclosed
May 16, 2025
Leak-site listing date
Threat group
Blacklock
64 victims listed
Country
Spain
#9 most targeted
Sector
Business Services

ThreatAI analysis

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

About the Blacklock group

BlackLock is a rebranded version of another ransomware group known as Eldorado. It has since become one of the most active extortion syndicates in 2025, heavily targeting technology, manufacturing, construction, finance, and retail sectors. Blacklock has listed 64 victims since November 2023.

Incident analysis

BUROTEC S.A. was listed by Blacklock ransomware, a group with 64 victims recorded in this database. The listing appeared on the group's leak site on May 16, 2025.

BUROTEC S.A. is based in Spain and operates in the Business Services sector. Spain ranks #9 worldwide for ransomware disclosures, with 483 victims in this database.

Sector context. Business services firms often have access to multiple client environments, making them high-value pivot points for ransomware operators seeking to maximise impact across multiple victim organisations.

Blacklock 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 BUROTEC S.A. attacked by ransomware?

Yes. BUROTEC S.A. was listed as a victim of the Blacklock ransomware group on May 16, 2025. The organisation is based in Spain and operates in the Business Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked BUROTEC S.A.?

BUROTEC S.A. was attacked by Blacklock ransomware. Blacklock is one of the most active ransomware groups, having claimed 64 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the BUROTEC S.A. ransomware attack occur?

The ransomware attack on BUROTEC S.A. was disclosed on May 16, 2025. 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 BUROTEC S.A. ransomware attack?

The specific data stolen from BUROTEC S.A. 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 Business Services organisation, BUROTEC S.A. likely held sensitive business data, client information, and operational records.

How can organisations protect against Blacklock attacks?

To defend against Blacklock 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.