This record tracks a ransomware attack claimed by the
revil group against
kuk.de / KREBS + KIEFER / 500GB. 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.
-53days
t1 · Published
t2 · Disclosed
Published
September 09, 2021
Disclosed / Notified
Jul 19, 2021
Attack Summary
kuk.de / KREBS + KIEFER / 500GB was named by the revil ransomware group as a targeted organization. It operates in the Other sector. The incident was first observed on September 09, 2021.
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 kuk.de
— indexed by HaveIBeenRansom.
6
found in Infostealer logs
35+
found in Traditional breaches
4+
found in Ransomware leaks
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
WEICON
medusa · ransomware
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
Collection1_BF.7z.003
formaceft_db · breach
••• emails
MyHeritage_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
+ 5 more leak sources locked
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.