This record tracks a ransomware attack claimed by the
thegentlemen group against
Gfeller Treuhand und Verwaltungs. 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.
1day open
t1 · Published
t2 · Pending
Published
August 13, 2026
Disclosed / Notified
Not disclosed yet
Attack Summary
gfeller-treuhand.ch zoominfo.com/c/gfeller-treuhand-und-verwaltungs-ag/372661395 Gfeller Treuhand und Verwaltungs AG is a Swiss real estate and fiduciary company based in Dübendorf, operating since 1980. They specialize in comprehensive property management, real estate sales, and leasing services. The firm provides professional administrative support, utilizing modern IT solutions to efficiently handle property maintenance and tenant relations.
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 gfeller-treuhand.ch
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
14
found in Traditional breaches
0
found in Ransomware leaks
Dropbox_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
ANTIPUBLIC #1.tar.zip.001
DBs Backup · breach
••• emails
Ronorp_Dump.rar
Database World ROC · breach
••• emails
MySpace_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
ExploitIn_BF.7z.001
Database World ROC · breach
••• emails
Exploit.in.rar
LKnet reserve chat · breach
••• emails
Расшифровка Badoo.com [25,8kk].rar
Misha-z88 DB · breach
••• emails
+ 1 more leak sources 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.