This record tracks a ransomware attack claimed by the
d4rk4rmy group against
MIZUHA FINANCIAL GROUP. 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.
-50days
t1 · Published
t2 · Disclosed
Business Category
Finance / Legal / Insurance
Published
August 07, 2025
Disclosed / Notified
Jun 19, 2025
Attack Summary
https://www.mizuhogroup.com In 2002, Dai–Ichi Kangyo Bank, Fuji Bank, and the Industrial Bank of Japan merged to form the Mizuho Financial Group. Since then, Mizuho has developed an extensive network in Asia and the rest of the world through a consistent…
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 mizuhogroup.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
1,424
found in Traditional breaches
231
found in Ransomware leaks
pureincubation-com.7z.001
Database World ROC · breach
••• emails
Televerde
play · ransomware
••• emails
Marcus & Millichap, Inc.
shinyhunters · breach
••• emails
udemy.com.zip
Database World ROC · breach
••• emails
CapitalEconomics_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
National Railroad Passenger Corporation (amtrak.com)
shinyhunters · breach
••• emails
contacts_120.csv
Database World ROC · breach
••• emails
shouldve_paid_the_ransom_abrigo-SHINYHUNTERS.7z
Database World ROC · breach
••• emails
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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.