Mizuha Financial Group
bd_2544f23fe1f01ada · schema v1 · pii pii-v1
Full breach record for Mizuha Financial Group →Threat-actor claim — not a regulatory filing
This row is a claim by the ransomware group D4rk4rmy on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.
Source: Ransomware.live
Post text · scraped from the leak site
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...
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Incident timeline — mostly unverified
? — ?
Breach window unknown
Aug 7, 2025
Claim posted
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No filing yet · watching
Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.
Claim → filing
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Compliance clock
Not assessable
Evidence ladder
Attacker assertion only. Establishes: claim date, group, alleged victim.
Unlocks: incident narrative, operational impact. Still no compliance clock.
Unlocks: discovery date, data types, affected count, compliance clock.
Unlocks: materiality, stated response, full audit trail. Ceiling removed.
No regulatory filing corroborates this yet — it is the attacker's own assertion. Watch this entity to be notified the moment a filing corroborates or contradicts it.
Source ceiling
- actor name
- victim claim
- ransom/leak status
- discovery date
- materiality
- notification
- affected count
- confirmed data types
- compliance clock
The ✕ fields stay blank until a regulatory filing or victim disclosure lands.
d4rk4rmy
According to ransomware.live, D4rk4rmy is a ransomware and data extortion group active since at least 2025, targeting financial services, hospitality, technology, and logistics sectors, operating a RaaS model with notable claimed victims including the Monte Carlo casino resort.