Summa4

Summa4 was compromised in a ransomware attack attributed to deadlock in June 2026. The organization, operating in the Not Found sector in Spain, was added to the group's data leak site as part of an extortion campaign.

deadlock operates as a financially motivated ransomware-as-a-service (RaaS) operation, exfiltrating sensitive data and threatening public disclosure to pressure victims into paying ransom demands.

SUMMA 4 Asesores Legales y Tributarios is a Madrid-based firm specializing in legal and tax advisory for businesses and high-net-worth individuals. Established in 2008, the firm provides tailored strategies in tax, commercial, and labor law, with a particular focus on family businesses and family offices.