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KISNET Corporation Ransomware Attack

kisnet.co.jpRansomed

brain cipherGroup

JapanCountry

Jan 22, 2026Discovered

Overview

View group profile

Domain

kisnet.co.jp

Industry

Technology

Country

Japan

Discovered

7 months ago

Confidence

70%

Severity

Medium

Status

Claimed

Threat group

brain cipher

Total victims

First seen

Oct 2025

Last seen

Jul 2026

Group status

active

Sophistication

Impact score

Threat level

5.8/10

Aggressiveness10/10

Lethality2.1/10

Criticality5.2/10

Status breakdown

Data Leaked58.3%14

Claimed

this victim

41.7%10

Targeted sectors

Education Energy & Utilities Financial Services Government & Defense Healthcare Hospitality Manufacturing Other Professional Services Retail & E-Commerce Technology

Victim's position within group

Industry

Technology

Known target sector

Country

Japan

Frequently targeted country

Other victims

View all (33)

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Ahad&Co CPA
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Claimed

Group activity

Monthly attacks · brain cipher

total · avg 3/mo