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Yaomasa Ransomware Attack

yaomasa.comRansomed

JapanCountry

Aug 13, 2026Discovered

Overview

View group profile

Domain

yaomasa.com

Industry

Financial Services

Country

Japan

Discovered

about 1 month ago

Attack date

Aug 13, 2026

Confidence

90%

Severity

Medium

Status

Claimed

Threat group

Total victims

43

First seen

Oct 2025

Last seen

Aug 2026

Threat level

2/10

Aggressiveness5/10

Lethality0/10

Criticality0.8/10

Status breakdown

Claimed

this victim

100.0%43

Targeted sectors

Education Financial Services Government & Defense Healthcare Manufacturing Other Professional Services Retail & E-Commerce Technology Transportation

Victim's position within group

Industry

Financial Services

Known target sector

Country

Japan

Not a listed target country

Other victims

Same group · AiLock

Group activity

Monthly attacks · AiLock

43

total · avg 5.4/mo