Was MEISA - Sines hit by ransomware?

MEISA - Sines was listed by the Qilin ransomware operation (Portugal), 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 Qilin ransomware group?

Qilin 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 MEISA - Sines breach?

Qilin published data attributed to MEISA - Sines. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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MEISA - Proyectos y Mantenimientos Mecánicos, Eléctricos y de Instrumentación, S.A.

listed as MEISA - Sines · Claimed by Qilin · listed 3 months ago

Age

since listed · data leaked

Status timeline

ListedJun 3, 2026
Data leakeddate unknown

At a glance

Group: Qilin
Status: Data leaked
Country: Portugal
Sector: Energy
Listed on leak site: Jun 3, 2026

About the victim

AI dossier — public-source company profile

MEISA is a Spanish industrial services company specializing in mechanical, electrical, and instrumentation projects and maintenance. Based in Spain (phone/fax indicate Spanish contact details), the company emphasizes quality, safety, and environmental management in serving industrial clients.

Industry: Industrial Services & Engineering (Mechanical, Electrical, Instrumentation)

Attack summary

Severity: medium — Data has been published by the group (confirmed 'data_published' status), indicating successful exfiltration. However, without visibility into the actual leak post content, proof files, or data inventory details, the sensitivity and scale cannot be fully assessed. Industrial/engineering data typically carries moderate risk unless it includes operational technology details or client information.

Qilin ransomware group claims to have attacked MEISA and published data. No specific details on encryption, exfiltration scope, or data types are provided in the available leak post excerpt.

medium

What the group claims

N/A

Sources

Source

Indexed 3 months 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 Qilin

Qilin is a ransomware group that emerged in October 2022, operating with primarily financial motivations through targeted attacks against organizations across multiple sectors. The group appears to operate independently with limited public information available regarding their specific country of origin or affiliations to other ransomware families. Qilin employs double extortion tactics, typically exfiltrating sensitive data before deploying their encryption payload, though specific details about their initial access vectors and technical tools remain less documented in public security research. The group has demonstrated a broad targeting approach, with their 1645 known victims spanning multiple countries including the United States, France, Canada, United Kingdom, and Germany, with particular focus on manufacturing, technology, healthcare, and business services sectors. Based on available intelligence reporting, Qilin remains an active threat as of recent assessments, continuing their ransomware operations without significant reported law enforcement disruption. The group has been linked to 2,233 public disclosures across our corpus. First observed on a leak site on October 8, 2022; most recent post August 25, 2026. The operation is currently active.

Timeline of this disclosure

June 3, 2026MEISA - Sines listed by Qilinon the group's public leak site

Other recent disclosures by Qilin

Qilin has been linked to 2,233 public victims on Darkfield. A sample of the most recent:

See the full Qilin dossier →

Sector and geography

This disclosure adds to ransomware activity in the Energy sector, which has 652 disclosures indexed across all operators we track. Geographically, MEISA - Sines is reported in Portugal, a country with 8 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Qilin means MEISA - Sines 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, CERT.PT (Portugal), as required for your jurisdiction.
Monitor for the data appearing on Qilin'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.