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Cyber Threat
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Ransomware victim Education

zsfh.cz

Listed by Lockbit5 on · organisation based in Czech Republic

zsfh.cz

Disclosed
Apr 14, 2026
Leak-site listing date
Threat group
Lockbit5
396 victims listed
Country
Czech Republic
#33 most targeted
Sector
Education

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Lockbit5. Figures and technique mappings are quoted from the source data, not inferred.

About the Lockbit5 group

LockBit 5.0 ("ChuongDong") emerged in September 2025 as the group's resurgence following the February 2024 law enforcement takedown, introducing cross-platform payloads targeting Windows, Linux, and VMware ESXi with enhanced evasion capabilities and continuing the RaaS affiliate model of its predecessors. Lockbit5 has listed 374 victims since April 2023.

Incident analysis

zsfh.cz was listed by Lockbit5 ransomware, a group with 396 victims recorded in this database. The listing appeared on the group's leak site on April 14, 2026.

zsfh.cz is based in Czech Republic and operates in the Education sector. Czech Republic ranks #33 worldwide for ransomware disclosures, with 97 victims in this database.

Sector context. Educational institutions often have under-resourced IT security teams and hold large amounts of student and faculty personal data, making them attractive targets for ransomware groups.

Lockbit5 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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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 zsfh.cz attacked by ransomware?

Yes. zsfh.cz was listed as a victim of the Lockbit5 ransomware group on April 14, 2026. The organisation is based in Czech Republic and operates in the Education sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked zsfh.cz?

zsfh.cz was attacked by Lockbit5 ransomware. Lockbit5 is one of the most active ransomware groups, having claimed 396 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the zsfh.cz ransomware attack occur?

The ransomware attack on zsfh.cz was disclosed on April 14, 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 zsfh.cz ransomware attack?

The specific data stolen from zsfh.cz 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 Education organisation, zsfh.cz likely held student and faculty personal data and academic records.

How can organisations protect against Lockbit5 attacks?

To defend against Lockbit5 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.