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Summa4

Ransomware attack by Deadlock · Disclosed June 15, 2026 · 🇪🇸 Spain

summa4.es

Date Disclosed
Jun 15, 2026
2026
Threat Group
Deadlock
101 total victims
Country
🇪🇸 Spain
Industry
Professional Services

ThreatAI Analysis

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

About the Deadlock group

Deadlock has listed 95 victims since May 2026.

Incident Analysis

Summa4 was targeted by Deadlock ransomware, one of the most active ransomware groups in our database with 101 confirmed victims globally. The attack was disclosed on June 15, 2026, when Summa4 appeared on the group's dark web leak site.

Summa4 is based in Spain , operating in the Professional Services sector. Spain ranks #9 globally for ransomware attacks, with 425 victims in our 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.

Deadlock 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 6, 2026 14:00 UTC.

Frequently Asked Questions

Was Summa4 attacked by ransomware?

Yes. Summa4 was listed as a victim of the Deadlock ransomware group on June 15, 2026. The organisation is based in Spain and operates in the Professional Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Summa4?

Summa4 was attacked by Deadlock ransomware. Deadlock is one of the most active ransomware groups, having claimed 101 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Summa4 ransomware attack occur?

The ransomware attack on Summa4 was disclosed on June 15, 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 Summa4 ransomware attack?

The specific data stolen from Summa4 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 Professional Services organisation, Summa4 likely held sensitive business data, client information, and operational records.

How can organisations protect against Deadlock attacks?

To defend against Deadlock 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.