Was ALVAC SA hit by ransomware?

ALVAC SA was listed by the Avoslocker 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 Avoslocker ransomware group?

Avoslocker 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 ALVAC SA breach?

Avoslocker published data attributed to ALVAC SA. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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ALVAC S.A.

listed as ALVAC SA · Claimed by Avoslocker · listed 4 years ago

43m

Age

since listed · data leaked

Status timeline

ListedDec 26, 2022
Data leakeddate unknown

At a glance

Group: Avoslocker
Status: Data leaked
Country: France
Sector: Technology
Listed on leak site: Dec 26, 2022

About the victim

AI dossier — public-source company profile

ALVAC S.A. is a Spanish company operating under the domain alvac.es. Based on publicly available information, ALVAC is a major civil engineering and construction firm based in Spain, involved in large infrastructure projects such as roads, highways, and public works. The company operates at a significant scale within the Iberian construction sector.

Industry: Construction & Civil Engineering

Attack summary

Severity: high — Confirmed exfiltration with published proof (confidential video on Vimeo), network encryption claimed, and threat of further data publication. Significant business data and operational disruption to a major infrastructure/construction firm is at stake.

AvosLocker claims to have exfiltrated confidential files and videos from ALVAC S.A.'s servers and encrypted their networks, threatening to publish additional leaked files and video content unless a decryption agreement is reached. The group states it has already published confidential video material via Vimeo as proof of access.

high

Data the group says was taken

AI dossier — extracted from the leak post

Confidential video files
Exfiltrated company files
Internal server data

The group's post references roughly 1 proof file.

What the group claims

Website - https://alvac.es Company name: ALVAC S.A. Companies System Administrator trying to hide the cyberattack on the ALVAC S.A. servers. Vídeos confidenciales https://vimeo.com/752214614 AvosLocker team is ready to leak more files on the blog, publish video-files and attack networks again. We should agree with you to decrypt your networks and remove all ALVAC S.A. exfiltrated files from AvosLocker team servers. https://twitter.com/PedroFe12181764/status/1575117531957846017 https://twitter.com/search?q=%40alvac&src=typed_query&f=live

Source

Indexed 4 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 Avoslocker

**Overview**: AvosLocker is a financially motivated ransomware group that emerged in June 2021, operating as both a Ransomware-as-a-Service (RaaS) platform and conducting direct attacks against organizations worldwide. The group has demonstrated sophisticated capabilities and has targeted over 70 victims across multiple critical sectors. **Origin & Affiliation**: While the exact country of origin remains unclear, AvosLocker operates as a RaaS model, recruiting affiliates to conduct attacks using their ransomware payload and infrastructure. The group has shown no clear ties to state-sponsored activities, appearing to be purely profit-driven cybercriminals. **Attack Methodology**: AvosLocker typically gains initial access through compromised Remote Desktop Protocol (RDP) credentials, VPN vulnerabilities, and phishing campaigns, subsequently deploying tools like Cobalt Strike for lateral movement and persistence. The group employs double extortion tactics, stealing sensitive data before encrypting systems and threatening to publish the information on their leak site if ransom demands are not met. Their ransomware uses strong encryption algorithms and includes capabilities to terminate security processes and delete shadow copies to prevent recovery. **Notable Campaigns**: The group has particularly targeted critical infrastructure sectors including education, manufacturing, finance, healthcare, and transportation, with significant attacks reported against organizations in the United States, Germany, Singapore, Canada, and France. CISA and FBI have issued joint advisories warning about AvosLocker's targeting of critical infrastructure, highlighting the group's impact on essential services. **Current Status**: As of recent threat intelligence reporting, AvosLocker remains active, continuing to recruit affiliates and conduct ransomware operations against organizations globally. The group has been linked to 70 public disclosures across our corpus. First observed on a leak site on June 13, 2021; most recent post February 11, 2023. The operation is currently inactive.

Also tracked as: Avos.

Timeline of this disclosure

December 26, 2022ALVAC SA listed by Avoslockeron the group's public leak site

Other recent disclosures by Avoslocker

Avoslocker has been linked to 70 public victims on Darkfield. A sample of the most recent:

See the full Avoslocker dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,549 disclosures indexed across all operators we track. Geographically, ALVAC SA is reported in France, a country with 612 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Avoslocker means ALVAC SA 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 Avoslocker'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.