This record tracks a ransomware attack claimed by the
Deadlock group against
Muzeum Valassko. 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.
-82days
t1 · Published
t2 · Disclosed
Business Category
NGOs / Associations
Disclosed / Notified
Apr 19, 2026
Attack Summary
Muzeum regionu Valašsko (The Museum of the Wallachian Region) is a multi-site cultural institution in the Zlín Region of the Czech Republic.
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 muzeumvalassko.cz
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
50+
found in Traditional breaches
2+
found in Ransomware leaks
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
Exploit.in.rar
LKnet reserve chat · breach
••• emails
AntiPublic_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
2844Breaches_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Pemiblanc.com - Pemiblanc Credential Stuffing List.part16.rar
@mvddsp Reserv · ransomware
••• emails
Leaked Database Archive_2.7z.001
formaceft_db · breach
••• emails
NexusMods_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
+ 4 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.