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Grupo Santillana

Ransomware attack by Hellcat · Disclosed March 25, 2025 · 🇪🇸 Spain

santillana.com

Date Disclosed
Mar 25, 2025
2025
Threat Group
Hellcat
20 total victims
Country
🇪🇸 Spain
Industry
Education

ThreatAI Analysis

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

About the Hellcat group

HellCat is a ransomware-as-a-service group that formed in Q4 2024 and quickly became notable for high-profile attacks against Schneider Electric, Telefónica, and Israel's Knesset, primarily gaining initial access via stolen Jira credentials harvested by infostealer malware, targeting critical infrastructure and government entities. Hellcat has listed 20 victims since October 2024.

Incident Analysis

Grupo Santillana was targeted by Hellcat ransomware, one of the most active ransomware groups in our database with 20 confirmed victims globally. The attack was disclosed on March 25, 2025, when Grupo Santillana appeared on the group's dark web leak site.

Grupo Santillana is based in Spain , operating in the Education sector. Spain ranks #9 globally for ransomware attacks, with 425 victims in our database.

Sector context: Educational institutions often have under-resourced IT security teams and hold large amounts of student and faculty personal data, making them attractive targets for ransomware groups.

Hellcat typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Sep 5, 2026 20:00 UTC.

Frequently Asked Questions

Was Grupo Santillana attacked by ransomware?

Yes. Grupo Santillana was listed as a victim of the Hellcat ransomware group on March 25, 2025. The organisation is based in Spain and operates in the Education sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Grupo Santillana?

Grupo Santillana was attacked by Hellcat ransomware. Hellcat is one of the most active ransomware groups, having claimed 20 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Grupo Santillana ransomware attack occur?

The ransomware attack on Grupo Santillana was disclosed on March 25, 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 Grupo Santillana ransomware attack?

The specific data stolen from Grupo Santillana 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 Education organisation, Grupo Santillana likely held student and faculty personal data and academic records.

How can organisations protect against Hellcat attacks?

To defend against Hellcat 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.