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ayesa.com

Claimed by Blackbasta · listed 2 years ago

27m
Age
since listed · data leaked

Status timeline

  1. ListedMay 4, 2024
  2. Data leakeddate unknown

At a glance

Group
Blackbasta
Status
Data leaked
Country
Spain
Sector
Technology
Listed on leak site
May 4, 2024

About the victim

AI dossier — public-source company profile

Ayesa is a global provider of engineering and technology services with over 12,500 employees and direct presence in 23 countries across Europe, America, Africa, and Asia. The company specializes in digital transformation, infrastructure design, and engineering solutions for both private companies and public administrations, with expertise in sustainability and resource management.

Industry
Engineering & Technology Services
Address
21 Avda Francisco De La Roche, Santa Cruz de Tenerife, Canary Islands 38001, Spain
Employees
12500

Attack summary

Severity: critical — Confirmed exfiltration of 4.5TB+ of data including employee personal data (PII at scale) and sensitive business/project information from a large multinational engineering firm with 12,500+ employees. Data has been published by the threat actor.

BlackBasta claims to have exfiltrated approximately 4.5TB+ of company data including internal company records, employee personal data, project files, and CAD designs. The group has published the data.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Company data
  • Employee personal data
  • Project files
  • CAD designs
  • Business records

What the group claims

Ayesa is a leading provider of technology and engineering services worldwide with over 12,500 employees and a direct presence in 23 countries across Europe, America, Africa, and Asia. Ayesa excels in developing and implementing innovative digital and engineering solutions for both private companies and public administrations. On the engineering side, our professionals applies the latest cutting-edge technologies to design and supervise infrastructure projects as well as create digital solutions that manage sustainability and efficient resources management. On the technology standpoint, we integrate all the essential technologies and services, to assist clients in resolving their most urgent business challenges and digitally transforming their business to make life easier, responsive, efficient and agile.SITE: www.ayesa.com Address : 21 Avda Francisco De La Roche Santa Cruz de Tenerife Canary Islands 38001, SpainALL DATA SIZE: ≈4.5tb+ 1. Company data 2. Employees personal data 3. Projects, CAD And much more…

Sources

Source

Indexed 2 years 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 blackbasta

Black Basta is a highly sophisticated ransomware group that emerged in April 2022 and operates with a primary motivation of financial extortion, having rapidly established itself as one of the most prolific ransomware operations of the modern era with over 500 confirmed victims globally. The group is widely assessed by researchers including Mandiant and CISA to have likely ties to former members of the Conti ransomware syndicate following that group's dissolution in mid-2022, and operates as a private Ransomware-as-a-Service (RaaS) model with a closed affiliate structure rather than open recruitment, with suspected links to the FIN7 threat actor cluster based on observed tooling overlaps documented by SentinelOne and Microsoft. Black Basta employs a double extortion methodology, exfiltrating sensitive victim data prior to encryption and threatening publication on their Tor-based leak site "Basta News" to compound pressure on victims; initial access is predominantly achieved through phishing campaigns, purchase of stolen credentials, and exploitation of known vulnerabilities including QakBot malware distribution, with the group subsequently deploying tools such as Cobalt Strike, SystemBC, and their custom encryptor targeting both Windows and VMware ESXi environments using a ChaCha20 encryption algorithm. Per CISA and FBI joint advisory AA24-131A published in May 2024, the group has struck over 500 organizations across North America, Europe, and Australia, with high-profile victims including Ascension Health, Capita, the American Dental Association, and Rheinmetall, demonstrating a clear preference for manufacturing, business services, technology, transportation, and food production sectors across the United States, United Kingdom, Germany, Canada, and Italy. As of the time of available public reporting, Black Basta remained operationally active, though internal chat logs leaked in early 2025 revealed significant internal tensions and potential organizational fragmentation that security researchers assessed could impact the group's near-term operational cohesion. The group has been linked to 523 public disclosures across our corpus. First observed on a leak site on April 26, 2022; most recent post January 11, 2025. The operation is currently inactive.

Timeline of this disclosure

  • May 4, 2024ayesa.com listed by blackbastaon the group's public leak site

Other recent disclosures by blackbasta

blackbasta has been linked to 523 public victims on Darkfield. A sample of the most recent:

See the full blackbasta dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,563 disclosures indexed across all operators we track. Geographically, ayesa.com is reported in Spain, a country with 129 ransomware disclosures in our corpus.

If your organisation is affected

A listing by blackbasta means ayesa.com 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 blackbasta'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.