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Cyber Threat
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Ransomware victim Hospitality and Tourism

Waterford Hotel Group

Listed by Interlock on · organisation based in Ireland

https:waterfordhotelgroup.com

Disclosed
May 11, 2026
Leak-site listing date
Threat group
Interlock
145 victims listed
Country
Ireland
#42 most targeted
Sector
Hospitality and Tourism

ThreatAI analysis

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

About the Interlock group

Interlock is a ransomware group first observed in September 2024 that targets critical infrastructure sectors including healthcare, government, education, and technology across North America and Europe using double-extortion, with 57+ claimed victims including a major US dialysis provider exposing over two million patient records. Interlock has listed 132 victims since December 2023.

Vulnerabilities Interlock is recorded exploiting

1 of these 1 are in the CISA Known Exploited Vulnerabilities catalog, 1 of them recorded by CISA as used in ransomware campaigns. CVEs attributed to Interlock across its reported activity. There is no indication that any of these was involved in the Waterford Hotel Group incident — the source data does not record an entry point.

Incident analysis

Waterford Hotel Group was listed by Interlock ransomware, a group with 145 victims recorded in this database. The listing appeared on the group's leak site on May 11, 2026.

Waterford Hotel Group is based in Ireland and operates in the Hospitality and Tourism sector. Ireland ranks #42 worldwide for ransomware disclosures, with 69 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.

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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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

Yes. Waterford Hotel Group was listed as a victim of the Interlock ransomware group on May 11, 2026. The organisation is based in Ireland and operates in the Hospitality and Tourism sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Waterford Hotel Group?

Waterford Hotel Group was attacked by Interlock ransomware. Interlock is one of the most active ransomware groups, having claimed 145 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Waterford Hotel Group ransomware attack occur?

The ransomware attack on Waterford Hotel Group was disclosed on May 11, 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 Waterford Hotel Group ransomware attack?

The specific data stolen from Waterford Hotel Group 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 Hospitality and Tourism organisation, Waterford Hotel Group likely held sensitive business data, client information, and operational records.

How can organisations protect against Interlock attacks?

To defend against Interlock 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.