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mainichi.jp Domain Breach Exposure Report

Risk Score

High Risk

Massive event volume or critical assets compromised.

AI Findings Summary

Critical

The telemetry indicates a significant exposure event impacting the domain mainichi.jp, with a risk score of 76. The primary concern stems from 1509 historical data breaches, predominantly sourced from "Combolist sources," and 347 active infostealer logs. The timeline shows a notable increase in employee and client-related events from late 2025 through mid-2026, with peaks in March and April 2026. Malware families like LummaC2, Redline, and Rhadamanthys are frequently observed. The affected services include login portals and the main domain, with the majority of observed activity originating from Japan and the United States.

Total Events

1,856
credential exposure events

Employee Affected Events

94
account email domain = mainichi.jp

Client Affected Events

1,762
service target = mainichi.jp

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12-Month Events Timeline

Event volume by breach date, employee VS client

EmployeesClients
4002671330
peak month 393
Jul 25Sep 25Nov 25Jan 26Mar 26May 26Jun 26

Infostealers VS Data Breaches

Live stealer logs VS data breaches

Infostealer logs
Events347
Share19%
Data breaches
Events1,509
Share81%
Infostealer logs (19%)
347events
Data breaches (81%)
1,509events

94 compromised employee accounts pose an infrastructure risk, while 1,762 leaked client credentials create regulatory liability.

Antivirus Distribution

Security Tools on Infected Endpoints

Windows Defender3

Malware Families Distribution

Distribution of Active Stealer Strains

LummaC241
Redline37
Rhadamanthys21
Vidar10
Acreed5
Millenium5
StealC3
Raccoon3

Top Login URLs

Top exposed services found in the event results

  1. 1https://accounts.mainichi.jp/login162
  2. 2https://mainichi.jp/signup/accounts/free/login/159
  3. 3https://mainichi.jp158
  4. 4https://accounts.mainichi.jp150
  5. 5accounts.mainichi.jp121
  6. 6mainichi.jp111
  7. 7mainichi.jp/signup/accounts/free/login/99
  8. 8accounts.mainichi.jp/login97
  9. 9https://accounts.mainichi.jp/pfree/signup83
  10. 10accounts.mainichi.jp/pfree/signup57

Infostealer By Geography

Shows the distribution of Infostealer-related credential exposure events across different geographic regions. The location is determined by analyzing the metadata of the infected machines associated with each event.

Japan
Events144
United States
Events22
Bangladesh
Events5
India
Events4
China
Events4
Netherlands
Events3
Czechia
Events2
Egypt
Events2

Country Breakdown

  1. 1Japan144
  2. 2United States22
  3. 3Bangladesh5
  4. 4India4
  5. 5China4
  6. 6Netherlands3
  7. 7Czechia2
  8. 8Egypt2

Services Classification Distribution

Blast radius - closer to core = more critical infrastructure, size = credential volume

-
Total

Operating System Distribution

Distribution of compromised endpoint builds

Windows 1185
Windows 11 (Build 26200) (64 Bit)30
Windows 10 Pro (10.0.19045) x6412
Windows 11 build 22000 (64 Bit)11
Windows 11 24H2 build 26100 (64 Bit)9

Leak Repository Classification

Where the exposed records currently reside

0
Named breaches
1,509
Combolist pools
0
Unattributed dumps

Disclaimer: This report includes AI-generated content. AI can make mistakes, so verify important findings independently before taking action.