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Cyber Threat
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Ransomware victim Technology

zyxel

Listed by Helldown on · organisation based in Netherlands

Zyxel.eu

Disclosed
Aug 17, 2024
Leak-site listing date
Threat group
Helldown
36 victims listed
Country
Netherlands
#24 most targeted
Sector
Technology

ThreatAI analysis

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

About the Helldown group

Helldown is an aggressive ransomware group first documented in August 2024, known for exploiting Zyxel firewall vulnerabilities to gain initial access and conducting large-scale data exfiltration averaging 70 GB per victim, targeting IT services, telecommunications, manufacturing, and healthcare primarily in the US. Helldown has listed 36 victims since August 2024.

Incident analysis

zyxel was listed by Helldown ransomware, a group with 36 victims recorded in this database. The listing appeared on the group's leak site on August 17, 2024.

zyxel is based in Netherlands and operates in the Technology sector. Netherlands ranks #24 worldwide for ransomware disclosures, with 149 victims in this database.

Sector context. Technology companies hold intellectual property, customer data, and source code — all highly valuable assets. A successful ransomware attack can also put downstream customers at risk through supply chain exposure.

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files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished.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

Yes. zyxel was listed as a victim of the Helldown ransomware group on August 17, 2024. The organisation is based in Netherlands and operates in the Technology sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked zyxel?

zyxel was attacked by Helldown ransomware. Helldown is one of the most active ransomware groups, having claimed 36 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the zyxel ransomware attack occur?

The ransomware attack on zyxel was disclosed on August 17, 2024. 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 zyxel ransomware attack?

The specific data stolen from zyxel 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 Technology organisation, zyxel likely held source code, intellectual property, and customer data.

How can organisations protect against Helldown attacks?

To defend against Helldown 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.