This record tracks a ransomware attack claimed by the
qilin group against
Yooshin Engineering Corporation. 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.
-68days
t1 · Published
t2 · Disclosed
Country
Korea, Republic of
Business Category
Manufacturing / Engineering
Published
September 26, 2025
Disclosed / Notified
Jul 20, 2025
Attack Summary
Yooshin Engineering Corporation provides engineering consulting services in South Korea and internationally. It offers various services, including feasibility study, basic and detailed design, construction project management, and post-complet ...
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 yooshin.com
— indexed by HaveIBeenRansom.
16
found in Infostealer logs
14
found in Traditional breaches
0
found in Ransomware leaks
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
2844Breaches_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
zauba Private limited companies.xlsx
tni.mil.id · breach
••• emails
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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.