Was Summa4 hit by ransomware?

Summa4 was listed by the Deadlock ransomware operation (Spain), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Deadlock ransomware group?

Deadlock is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Summa4 breach?

Deadlock published data attributed to Summa4. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Summa4

Claimed by Deadlock · listed 4 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedJun 15, 2026
Data leakeddate unknown

At a glance

Group: Deadlock
Status: Data leaked
Country: Spain
Listed on leak site: Jun 15, 2026

About the victim

AI dossier — public-source company profile

Summa4 – Asesores Legales y Tributarios is a Madrid-based multidisciplinary law firm established in 2008 specializing in legal and tax advisory for businesses, high-net-worth individuals, and family offices. The firm offers services across commercial law, tax, labor law, and family business matters.

Industry: Legal & Tax Advisory Services
Address: Madrid, Spain
Founded: 2008

Attack summary

Severity: medium — A legal and tax advisory firm handling sensitive client financial and personal information has been breached with data published. The firm works with high-net-worth individuals and family offices, indicating access to financial and personal data of significant sensitivity. However, no specific data inventory, proof count, or confirmation of exfiltration scope is detailed in the post.

The Deadlock group claims to have attacked Summa4 and published data. No specific details on encryption, exfiltration method, or data types are provided in the leak post excerpt.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Client records
Tax advisory documentation
Business correspondence
Family office information

What the group claims

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.

Sources

Victim sitesumma4.es

Source

Indexed 4 hours ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Deadlock

Deadlock is a ransomware operator currently tracked by Darkfield. The group has been linked to 10 public disclosures across our corpus. First observed on a leak site on June 15, 2026. The operation is currently active.

Timeline of this disclosure

June 15, 2026Summa4 listed by Deadlockon the group's public leak site

Other recent disclosures by Deadlock

Deadlock has been linked to 10 public victims on Darkfield. A sample of the most recent:

See the full Deadlock dossier →

Sector and geography

Geographically, Summa4 is reported in Spain, a country with 125 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Deadlock means Summa4 appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, INCIBE-CERT (Spain), as required for your jurisdiction.
Monitor for the data appearing on Deadlock's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.