Was Estrategias BigMat S.L.U. hit by ransomware?

Estrategias BigMat S.L.U. was listed by the aurora 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 aurora ransomware group?

aurora 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 Estrategias BigMat S.L.U. breach?

aurora published data attributed to Estrategias BigMat S.L.U.. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Estrategias BigMat S.L.U.

Claimed by Aurora · listed 2 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedOct 14, 2026
Data leakeddate unknown

At a glance

Group: Aurora
Status: Data leaked
Country: Spain
Sector: Retail & E-Commerce
Listed on leak site: Oct 14, 2026

About the victim

AI dossier — public-source company profile

Estrategias BigMat S.L.U. is the Spanish master franchisee of BigMat International, a major European building materials distribution cooperative. The company operates 15+ subsidiary entities across Spain and employs 300–500 staff.

Industry: Building Materials Distribution & Retail
Employees: 300-500

Attack summary

Severity: critical — Confirmed exfiltration of large-scale regulated personal data: employee PII (names, tax IDs, IBANs) for 300–500 workers across multiple years; customer identity records; social security filings; and medical/occupational health data. This constitutes systematic disclosure of regulated data under Spanish/EU data protection law.

The Aurora group claims to have exfiltrated comprehensive payroll records, social security filings, customer databases, tax declarations, financial records spanning 5 years, and occupational health data from 12+ subsidiaries. The group asserts both encryption and data theft.

critical

Data the group says was taken

AI dossier — extracted from the leak post

SEPA payroll XML files (2022–2025)
Employee names, DNI/NIE numbers, IBANs
SILTRA Social Security database records
Customer loyalty cards with DNI/NIF
Modelo 347 tax notifications
5-year accounting journals and bank reconciliations
Insurance policies and loan agreements
Occupational health/PRL records and medical certificates

What the group claims

[distribution] Estrategias BigMat S.L.U. — the Spanish master franchisee of BigMat International, a French cooperative and one of Europe's largest building materials distribution networks. 624 SEPA payroll XML files (2022–2025) — every monthly salary payment for 300–500 employees across 15+ entities, with full names, DNI/NIE numbers, IBANs, and exact euro amounts. 20 SILTRA Social Security databases — the complete filing history for every subsidiary's workforce, containing números de afiliación, contribution bases, and employment records. <redacted> 2,690 customer loyalty cards with DNI/NIF identifiers — the entire customer-identity database. 888 Modelo 347 tax notifications — annual declarations to the Agencia Tributaria naming customers and suppliers with their DNI and transaction amounts. Complete financial records — 5 years of accounting journals, bank reconciliations, insurance policies, loan agreements, and invoices. Occupational health data (PRL) for 12+ subsidiaries — workplace injury reports, medical certificates, and risk assessments.

Sources

Source

Indexed 2 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About aurora

Aurora is a recently emerged ransomware group first observed in April 2026, operating with apparent financial motivations through targeted attacks across multiple sectors. Given its recent emergence, limited public documentation exists regarding the group's specific country of origin or affiliations with established ransomware operations, though its targeting patterns suggest a professional operation potentially operating as an independent entity rather than a known Ransomware-as-a-Service model. The group has demonstrated a preference for attacking business-critical sectors including business services, consumer services, manufacturing, healthcare, and financial services, with documented attacks spanning the United States, Canada, the Maldives, and Great Britain, though specific initial access vectors and technical methodologies remain undocumented by major threat intelligence firms. With only seven known victims documented since April 2026, Aurora represents a relatively small-scale operation compared to established ransomware families, though its cross-sector targeting approach and international victim scope indicate deliberate selection criteria rather than opportunistic attacks. The group remains active as of current reporting, though the limited victim count and recent emergence suggest either a highly selective targeting approach or a nascent operation still developing its operational capabilities. The group has been linked to 46 public disclosures across our corpus. First observed on a leak site on April 29, 2026; most recent post October 14, 2026. The operation is currently active.

Timeline of this disclosure

October 14, 2026Estrategias BigMat S.L.U. listed by aurora on the group's public leak site

Other recent disclosures by aurora

aurora has been linked to 46 public victims on Darkfield. A sample of the most recent:

See the full aurora dossier →

Sector and geography

This disclosure adds to ransomware activity in the Retail & E-Commerce sector, which has 22 disclosures indexed across all operators we track. Geographically, Estrategias BigMat S.L.U. is reported in Spain, a country with 129 ransomware disclosures in our corpus.

If your organisation is affected

A listing by aurora means Estrategias BigMat S.L.U. 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 aurora'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.