Was OSAC Aero hit by ransomware?

OSAC Aero was listed by the lapsus$ ransomware operation (France), 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 lapsus$ ransomware group?

lapsus$ 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 OSAC Aero breach?

lapsus$ published data attributed to OSAC Aero. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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OSAC Aero

Claimed by Lapsus$ · listed 5 months ago

Age

since listed · data leaked

Status timeline

ListedMar 1, 2026
Data leakeddate unknown

At a glance

Group: Lapsus$
Status: Data leaked
Country: France
Listed on leak site: Mar 1, 2026

About the victim

AI dossier — public-source company profile

OSAC Aero is described as a Spanish aeronautical engineering company providing aeronautical consulting services, product development, aircraft maintenance, and the design, prototyping, and manufacturing of aerostructures. The company is noted as a partner to leading global aerospace organisations. No independent public site content was available to verify or expand these details.

Industry: Aeronautical Engineering & Aerospace Consulting

Attack summary

Severity: high — Data has been published (disclosed status: data_published) by Lapsus$ involving an aerospace engineering firm, which likely holds sensitive technical IP, aerostructure designs, and client data related to major aerospace organisations; aerospace sector data carries significant national-security and commercial sensitivity.

Lapsus$ claims to have attacked OSAC Aero with data published, indicating exfiltration of company data; no ransom amount or specific data volume was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Aeronautical engineering documents
Product development data
Aircraft maintenance records
Aerostructure design/prototype files
Business/client records

Original description

AI-summarised, not from the leak post

"OSAC Aero" is a Spanish aeronautical engineering company. They provide aeronautical consulting services, product development, aircraft maintenance, and also focus on designing, prototyping, and manufacturing aerostructures. Their innovative solutions have established OSAC as a reliable partner for leading global aerospace organizations.

Source

Indexed 5 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 lapsus$

Lapsus$ is a financially motivated cybercriminal group that emerged in December 2021, gaining notoriety for their aggressive extortion tactics and high-profile targeting of major corporations and government entities. The group is believed to have originated from South America, particularly Brazil, with suspected ties to young hackers operating independently rather than as a traditional ransomware-as-a-service operation, though they have demonstrated sophisticated coordination and insider recruitment capabilities. Lapsus$ primarily relies on social engineering techniques, SIM swapping, and insider threats to gain initial access to target networks, often recruiting employees through bribes or coercion rather than relying on traditional malware delivery methods, and they frequently employ data theft and public leak tactics for extortion rather than always deploying encryption-based ransomware. The group has conducted notable attacks against major technology companies including Microsoft, Nvidia, Samsung, and Okta, as well as targeting organizations across France, the United States, Brazil, Germany, and Canada, with a particular focus on consumer services, education, government facilities, and critical manufacturing sectors, leading to significant law enforcement attention and arrests of suspected members. Following arrests of key members by Brazilian and UK authorities in 2022, the group's activity has significantly diminished, though some security researchers suggest remnants may still be operational under different identities. The group has been linked to 27 public disclosures across our corpus. First observed on a leak site on December 10, 2021; most recent post June 23, 2026. The operation is currently active.

Timeline of this disclosure

March 1, 2026OSAC Aero listed by lapsus$on the group's public leak site

Other recent disclosures by lapsus$

lapsus$ has been linked to 27 public victims on Darkfield. A sample of the most recent:

See the full lapsus$ dossier →

Sector and geography

Geographically, OSAC Aero is reported in France, a country with 612 ransomware disclosures in our corpus.

If your organisation is affected

A listing by lapsus$ means OSAC Aero 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-FR (France), as required for your jurisdiction.
Monitor for the data appearing on lapsus$'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.