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Cyber Threat
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Ransomware victim Business Services

Interzero

Listed by Fulcrumsec on · organisation based in Germany

interzero.de

Disclosed
May 1, 2026
Leak-site listing date
Threat group
Fulcrumsec
30 victims listed
Country
Germany
#2 most targeted
Sector
Business Services

ThreatAI analysis

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

About the Fulcrumsec group

FulcrumSec is a data extortion group active since approximately September 2025, specializing in high-speed exfiltration of cloud-hosted databases by exploiting unrotated API keys and misconfigured cloud permissions rather than deploying encryption, with known victims including Australian fintech youX and LexisNexis. Fulcrumsec has listed 27 victims since May 2026.

Incident analysis

Interzero was listed by Fulcrumsec ransomware, a group with 30 victims recorded in this database. The listing appeared on the group's leak site on May 1, 2026.

Interzero is based in Germany and operates in the Business Services sector. Germany ranks #2 worldwide for ransomware disclosures, with 1,004 victims in this database.

Sector context. Business services firms often have access to multiple client environments, making them high-value pivot points for ransomware operators seeking to maximise impact across multiple victim organisations.

Fulcrumsec 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 Interzero attacked by ransomware?

Yes. Interzero was listed as a victim of the Fulcrumsec ransomware group on May 1, 2026. The organisation is based in Germany and operates in the Business Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Interzero?

Interzero was attacked by Fulcrumsec ransomware. Fulcrumsec is one of the most active ransomware groups, having claimed 30 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Interzero ransomware attack occur?

The ransomware attack on Interzero was disclosed on May 1, 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 Interzero ransomware attack?

The specific data stolen from Interzero 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 Business Services organisation, Interzero likely held sensitive business data, client information, and operational records.

How can organisations protect against Fulcrumsec attacks?

To defend against Fulcrumsec 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.