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 13, 2026Gauthier Tissus listed by lamashtuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, Gauthier Tissus is reported in FR, a country with 238 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

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Gauthier Tissus

Claimed by lamashtu · listed 1 month ago

37d

Age

since listed · data leaked

Status timeline

Listed
Apr 13, 2026
Data leaked

At a glance

Group: lamashtu
Status: Data leaked
Country: FR
Sector: Manufacturing
Listed on leak site: Apr 13, 2026

About the victim

AI dossier — public-source company profile

Gauthier Tissus (operating as Gauthier SAS) is a French textile manufacturer based in the Rhône-Alpes region, specialised in the weaving and finishing of multi-risk technical fabrics for professional clothing, including PPE, high-visibility garments, uniforms, and brand-image apparel. The company holds ISO 9001-2015 certification and serves a range of industrial and corporate sectors. It offers both custom and standard fabric products under branded ranges such as Linstat and Bodyguard.

Industry: Technical & Protective Textile Manufacturing
Address: Rhône-Alpes, France

Attack summary

Severity: medium — Data has been published ('data_published' status), confirming exfiltration, but the leak post provides no detail on the nature or scale of the data, and no regulated/sensitive PII, financial, or critical infrastructure data is evidenced from available information.

The ransomware group Lamashtu claims an attack on Gauthier Tissus with a disclosed status of data_published, indicating that data has been exfiltrated and published. No specific details on the volume or categories of data were provided in the leak post.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Business/operational data

What the group claims

Based in the Rhone-Alpes basin, Gauthier Tissus is specialized in the weaving and finishing of multi-risk fabrics for technical usage, fabrics for brand image clothes and uniforms.

Sources

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.