This record tracks a ransomware attack claimed by the
rhysida group against
Cytek Biosciences. It collects the publicly disclosed attack details — sector, location and
timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAP
Window Zero is the time the breach stayed in the open before
anyone said so — the gap between when the attack was first discovered
on the operator's leak site (t1) and when it was publicly disclosed (t2).
The wider this window, the longer victims, staff and customers were exposed with no warning.
-83days
t1 · Published
t2 · Disclosed
Business Category
Services
Published
January 25, 2026
Disclosed / Notified
Nov 04, 2025
Attack Summary
Cytek Biosciences Cytek Biosciences is a leading cell analysis solutions company founded in 1992 and headquartered in Fremont, California with global offices across North America, Europe, and Asia. Sold 0% All data was sold, stay with us, we will upload new Companies later More
Leak Screenshots
SAMPLE
Proof-of-breach screenshots the operator posted from the stolen data. Previews are
redacted and locked — the originals are available on HaveIBeenRansom.
Dark Web Exposure
Findings for cytekbio.com
— indexed by HaveIBeenRansom.
20
found in Infostealer logs
322
found in Traditional breaches
36
found in Ransomware leaks
pureincubation-com.7z.001
Database World ROC · breach
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
parkmobile.io.7z
Leaks Aggregator @sqan7 · breach
••• emails
Arandell Corp
medusa · ransomware
••• emails
contacts_111.csv
Database World ROC · breach
••• emails
TAPAir_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
+ 17 more leak sources locked
Leak volumes are locked
Sign in to reveal how many records each source exposed and the remaining 20 sources.
Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.