This record tracks a ransomware attack claimed by the
qilin group against
STESAD. 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.
-39days
t1 · Published
t2 · Disclosed
Published
January 08, 2026
Disclosed / Notified
Dec 01, 2025
Attack Summary
STESAD was named by the qilin ransomware group as a targeted organization. It operates in the Other sector. The affected entity is based in Germany. The incident was first observed on January 08, 2026. Breach House catalogues this incident from publicly available leak-site data; no stolen files are hosted here.
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 stesad.de
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
10
found in Traditional breaches
0
found in Ransomware leaks
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••• emails
Facebook.7z.001
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••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Deezer_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
MyHeritage_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
29 Leaks
ddosecret · breach
••• emails
Leak volumes are locked
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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.