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Cyber Threat
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Ransomware victim Financial Services

FIDUCIAL

Listed by Lamashtu on · organisation based in France

fiducial.fr

Disclosed
Sep 30, 2026
Leak-site listing date
Threat group
Lamashtu
57 victims listed
Country
France
#6 most targeted
Sector
Financial Services

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Lamashtu. Figures and technique mappings are quoted from the source data, not inferred.

About the Lamashtu group

Lamashtu is an extortion group that first appeared in April 2026, claiming attacks against organizations in France, Romania, and Thailand across energy, pharmaceutical, and film sectors; it has not yet been confirmed as operating actual file-encrypting ransomware rather than pure data-theft extortion. Lamashtu has listed 48 victims since April 2026.

Incident analysis

FIDUCIAL was listed by Lamashtu ransomware, a group with 57 victims recorded in this database. The listing appeared on the group's leak site on September 30, 2026.

FIDUCIAL is based in France and operates in the Financial Services sector. France ranks #6 worldwide for ransomware disclosures, with 565 victims in this database.

Sector context. Financial sector organisations are targeted for their access to funds, sensitive financial data, and the reputational damage a public breach can cause. Regulatory requirements also increase recovery costs.

Lamashtu typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was FIDUCIAL attacked by ransomware?

Yes. FIDUCIAL was listed as a victim of the Lamashtu ransomware group on September 30, 2026. The organisation is based in France and operates in the Financial Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked FIDUCIAL?

FIDUCIAL was attacked by Lamashtu ransomware. Lamashtu is one of the most active ransomware groups, having claimed 57 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the FIDUCIAL ransomware attack occur?

The ransomware attack on FIDUCIAL was disclosed on September 30, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the FIDUCIAL ransomware attack?

The specific data stolen from FIDUCIAL has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Financial Services organisation, FIDUCIAL likely held financial records, client data, and transaction histories.

How can organisations protect against Lamashtu attacks?

To defend against Lamashtu and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.