This record tracks a ransomware attack claimed by the
sinobi group against
Halcyontek. 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.
-67days
t1 · Published
t2 · Disclosed
Business Category
Communication / Marketing
Published
February 10, 2026
Disclosed / Notified
Dec 06, 2025
Attack Summary
Halcyon is the industrys first dedicated, adaptive security platform that combines multiple proprietary advanced prevention engines along with AI models focused specifically on stopping ransomware. Halcyon is built by offensive security experts to stop attackers.
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 halcyontek.com
— indexed by HaveIBeenRansom.
5
found in Infostealer logs
214+
found in Traditional breaches
34+
found in Ransomware leaks
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
limeleads_breach.7z
TheUnderground - Reborn · breach
••• emails
Televerde
play · ransomware
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
Merritt Properties, LLC
medusa · ransomware
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
linkedIN_2.7z.001
Database World ROC · 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.