Disclosure context

About lamashtu

Based on the limited available information, Lamashtu is an emerging ransomware group that was first observed in April 2026, appearing to be financially motivated based on their operational patterns. The group's origin and potential affiliations remain unclear due to their recent emergence and limited public documentation by major threat intelligence organizations. Lamashtu's attack methodology and specific technical capabilities have not been extensively documented by established security researchers, though their targeting patterns suggest they employ standard ransomware deployment techniques across multiple industry verticals. The group has conducted at least 8 confirmed attacks, demonstrating a geographically diverse targeting approach with victims identified in France, Italy, the United States, Singapore, and Malaysia, while focusing primarily on business services, manufacturing, transportation and logistics, hospitality and tourism, and energy sectors. Given the group's recent first observation in April 2026 and limited public threat intelligence reporting from established sources like CISA, FBI, or major security firms, Lamashtu appears to represent a newly active threat actor whose current operational status and long-term capabilities require further monitoring and analysis. The group has been linked to 30 public disclosures across our corpus. First observed on a leak site on April 13, 2026; most recent post May 19, 2026. The operation is currently active.

Timeline of this disclosure

April 15, 2026VOLTERRIES listed by lamashtuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Energy sector, which has 374 disclosures indexed across all operators we track. Geographically, VOLTERRIES is reported in France, a country with 472 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Volterres

listed as VOLTERRIES · Claimed by lamashtu · listed 1 month ago

35d

Age

since listed · data leaked

Status timeline

Listed
Apr 15, 2026
Data leaked

At a glance

Group: lamashtu
Status: Data leaked
Country: France
Sector: Energy
Listed on leak site: Apr 15, 2026

About the victim

AI dossier — public-source company profile

Volterres is a French subsidiary of the Eiffage Group that supplies traced green electricity to businesses and public sector entities. It also acts as an aggregator for independent French renewable energy producers, offering PPA contracts, real-time traceability via blockchain technology, and digital self-consumption solutions. The company has been recognised in the top 3 electricity suppliers by energy buyers in the 2025 CLEEE/FNCCR survey.

Industry: Green Electricity Supply & Renewable Energy Aggregation

Attack summary

Severity: high — Data has been confirmed as published by the threat actor against a subsidiary of a major French infrastructure group (Eiffage) operating in the energy sector, a domain considered critical infrastructure; however, the specific data categories and volume are not described, preventing a critical rating.

The ransomware group Lamashtu claims to have attacked Volterres and has published data (disclosed status: data_published), though the leak post provides no explicit detail on whether encryption or exfiltration occurred or what specific data categories were taken.

high

What the group claims

Volterres, a subsidiary of the Eiffage group, is reinventing the supply of green electricity for businesses and public sector players.

Sources

Victim sitevolterres.fr
Leak posthttp://lamashtux5j74mcm7lwwgn5yrvuwtrpxjoyendif3v3hrztjesfoyayd.onion/post/72196be43f72a424ca72de5127a3cdbf

Source

Indexed 1 month 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.