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 14, 2026GRUPO RONDA listed by lamashtuon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, GRUPO RONDA is reported in MX, a country with 52 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

Grupo Ronda y Auditores S.L.P.

listed as GRUPO RONDA · Claimed by lamashtu · listed 1 month ago

37d

Age

since listed · data leaked

Status timeline

Listed
Apr 14, 2026
Data leaked

At a glance

Group: lamashtu
Status: Data leaked
Country: MX
Sector: Business Services
Listed on leak site: Apr 14, 2026

About the victim

AI dossier — public-source company profile

Grupo Ronda y Auditores S.L.P. is a Spanish professional services firm operating since 1978, providing statutory and voluntary audits, insolvency administration, forensic accounting reports for judicial proceedings, business advisory, and vehicle registration management (gestoría). The firm is staffed by registered auditors, insolvency administrators, forensic accountants, lawyers, and business administration graduates, and serves clients throughout Spain.

Industry: Audit, Forensic Accounting & Business Advisory Services
Founded: 1978

Attack summary

Severity: high — Data has been confirmed published by the threat actor. As an audit and forensic accounting firm, Grupo Ronda handles highly sensitive client financial, legal, and judicial records, including PII and confidential business data, making exposure of significant consequence even without explicit volume figures.

The Lamashtu ransomware group claims to have attacked Grupo Ronda and has published data (disclosed status: data_published), though the leak post does not specify whether encryption, exfiltration, or both occurred, nor does it detail the volume or nature of the stolen data.

high

Data the group says was taken

AI dossier — extracted from the leak post

Client financial and accounting records
Forensic accounting reports
Judicial proceeding documents
Business advisory files
Corporate legal documentation
Employee/professional credentials data

What the group claims

Grupo Ronda Auditores es un despacho constituido por un equipo de: Auditores, Mediadores Concursales, Expertos Contables, Licenciados en Derecho, debidamente colegiados. Licenciados en Administración y Dirección de empresas

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.