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Cyber Threat
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Ransomware victim Energy & Utilities

HEOLIS

Listed by Zawoo on · organisation based in France

Disclosed
Sep 19, 2026
Leak-site listing date
Threat group
Zawoo
27 victims listed
Country
France
#6 most targeted
Sector
Energy & Utilities

ThreatAI analysis

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

Zawoo listed HEOLIS on its dark web leak site on 19 September 2026; HEOLIS is based in France and operates in the Energy & Utilities sector.

About the Zawoo group

Zawoo has listed 25 victims since July 2026.

Incident analysis

HEOLIS was listed by Zawoo ransomware, a group with 27 victims recorded in this database. The listing appeared on the group's leak site on September 19, 2026.

HEOLIS is based in France and operates in the Energy & Utilities sector. France ranks #6 worldwide for ransomware disclosures, with 564 victims in this database.

Sector context. Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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

Yes. HEOLIS was listed as a victim of the Zawoo ransomware group on September 19, 2026. The organisation is based in France and operates in the Energy & Utilities sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked HEOLIS?

HEOLIS was attacked by Zawoo ransomware. Zawoo is one of the most active ransomware groups, having claimed 27 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the HEOLIS ransomware attack occur?

The ransomware attack on HEOLIS was disclosed on September 19, 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 HEOLIS ransomware attack?

The specific data stolen from HEOLIS 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 Energy & Utilities organisation, HEOLIS likely held sensitive business data, client information, and operational records.

How can organisations protect against Zawoo attacks?

To defend against Zawoo 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.