Cyber Threat Intelligence
CY
Ransomware Victim Healthcare

Cytek Biosciences

Ransomware attack by Rhysida · Disclosed January 25, 2026 · 🇺🇸 United States

Date Disclosed
Jan 25, 2026
2026
Threat Group
Rhysida
190 total victims
Country
🇺🇸 United States
Industry
Healthcare

Incident Analysis

Cytek Biosciences was targeted by Rhysida ransomware, one of the most active ransomware groups in our database with 190 confirmed victims globally. The attack was disclosed on January 25, 2026, when Cytek Biosciences appeared on the group's dark web leak site.

Cytek Biosciences is based in United States , operating in the Healthcare sector. United States ranks #1 globally for ransomware attacks, with 7,130 victims in our database.

Sector context: Healthcare organisations are high-value ransomware targets because patient data is extremely sensitive, regulatory penalties for breaches are severe, and operational downtime can threaten patient safety — all factors that increase ransom payment pressure.

Rhysida typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Apr 22, 2026 00:01 UTC.

Frequently Asked Questions

Was Cytek Biosciences attacked by ransomware?

Yes. Cytek Biosciences was listed as a victim of the Rhysida ransomware group on January 25, 2026. The organisation is based in United States and operates in the Healthcare sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Cytek Biosciences?

Cytek Biosciences was attacked by Rhysida ransomware. Rhysida is one of the most active ransomware groups, having claimed 190 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Cytek Biosciences ransomware attack occur?

The ransomware attack on Cytek Biosciences was disclosed on January 25, 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 Cytek Biosciences ransomware attack?

The specific data stolen from Cytek Biosciences 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 Healthcare organisation, Cytek Biosciences likely held patient records, medical data, and personally identifiable information (PII).

How can organisations protect against Rhysida attacks?

To defend against Rhysida 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.