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Cyber Threat
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Ransomware victim Professional Services

Summa4

Listed by Deadlock on · organisation based in Spain

summa4.es

Disclosed
Jun 15, 2026
Leak-site listing date
Threat group
Deadlock
111 victims listed
Country
Spain
#9 most targeted
Sector
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 104 victims since May 2026.

Incident analysis

Summa4 was listed by Deadlock ransomware, a group with 111 victims recorded in this database. The listing appeared on the group's leak site on June 15, 2026.

Summa4 is based in Spain and operates in the Professional Services sector. Spain ranks #9 worldwide for ransomware disclosures, with 480 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.

Deadlock 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 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 111 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.