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KUPER

thegentlemen

This record tracks a ransomware attack claimed by the thegentlemen group against KUPER. 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.

115days open
t1 · Published t2 · Pending
May 08, 2026Not disclosed yet
Country
Germany
Business Category
Manufacturing / Engineering
Employees
101-1000
Discovered
2026-05-09
Published
May 08, 2026
Disclosed / Notified
Not disclosed yet
Victim ID
cBy6VSRKnCiQ

Attack Summary

kuper.de Heinrich KUPER GmbH is an internationally active medium-sized company headquartered in Rietberg, Germany, with approximately 120–190 employees. The company specializes in developing and manufacturing machines and systems for veneer processing, solid wood working, automated packaging technology, and special-purpose woodworking equipment. As a quality leader in veneer and wood processing technology, KUPER serves customers worldwide with individualized solutions and comprehensive service support.

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.

file_tree.png
finance_2024.xlsx
passport_scan.jpg
contract_signed.pdf
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Dark Web Exposure

Findings for kuper.de — indexed by HaveIBeenRansom.
5
found in Infostealer logs
128+
found in Traditional breaches
44+
found in Ransomware leaks
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
WEICON
medusa · ransomware
••• emails
Planatol
ddosecret · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum 🪾 · breach
••• emails
Database World ROC · breach
••• emails
play · ransomware
••• emails
clop · ransomware
••• emails
+ 16 more leak sources locked
Leak volumes are locked
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