Summa4
About the organisation
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.
What the listing means
Summa4 appeared on the Deadlock leak site on 15 June 2026. Groups publish a victim once negotiations stall or as pressure during them, so a listing usually means data was already exfiltrated — the attack itself is dated 12 June 2026, 3 days before the listing. This group has published 75 claims in the last 30 days and remains active.
Recommended actions
- Treat any unsolicited message referencing Summa4 as suspicious — leaked data gets weaponised for phishing within days.
- If you hold an account on summa4.es, change that password now, update it anywhere you reused it, and enable two-factor authentication.
- Watch for follow-on extortion: stolen data is often re-leaked or resold after the initial listing.
- A leak-site listing is a claim made by the attacker, not a confirmed breach — check the organisation's own disclosures before acting on it.
Leak-site evidence
Listing URL https://www.ransomware.live/id/U3VtbWE0QERlYWRsb2Nr
Show leak-site screenshot
Captured from the group's extortion site. It may contain the victim's data or the attacker's messaging.
