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FIDUCIAL

Claimed by Lamashtu · listed 7 hours ago

Today
Age
since listed · data leaked

Status timeline

  1. ListedSep 30, 2026
  2. Data leakeddate unknown

At a glance

Group
Lamashtu
Status
Data leaked
Country
France
Sector
Financial Services
Listed on leak site
Sep 30, 2026

About the victim

AI dossier — public-source company profile

FIDUCIAL is a French business services group operating ~850 local agencies nationwide. They provide accounting, payroll, legal counsel, audit, online banking (Fiducial Banque), IT solutions (Fiducial Informatique), office supplies, security, and asset management to SMEs, professionals, and enterprises across multiple sectors.

Industry
Professional Services & Business Solutions

Attack summary

Severity: medium — Data published status confirms exfiltration occurred against a major service provider handling sensitive client financial and payroll records. However, the truncated leak post provides no detail on data scope, proof files, or specific sensitive categories, preventing confirmation of regulated data at scale.

The lamashtu group claims to have compromised FIDUCIAL and exfiltrated data. The leak post does not specify which data categories were taken, the operational impact, or ransom demands.

medium

What the group claims

Expert accounting, payroll, legal advice, audit, online banking (Fiducial Banque), IT solutions (Fiducial Informatique), office supplies and equipment (Fiducial Office Solutions), security, and asset management.

Sources

Source

Indexed 7 hours 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 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 44 public disclosures across our corpus. First observed on a leak site on April 13, 2026; most recent post September 30, 2026. The operation is currently active.

Timeline of this disclosure

  • September 30, 2026FIDUCIAL listed by lamashtu on the group's public leak site

Other recent disclosures by lamashtu

lamashtu has been linked to 44 public victims on Darkfield. A sample of the most recent:

See the full lamashtu dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,195 disclosures indexed across all operators we track. Geographically, FIDUCIAL is reported in France, a country with 242 ransomware disclosures in our corpus.

If your organisation is affected

A listing by lamashtu means FIDUCIAL 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 lamashtu'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.