Skip to main content
Back to overview
Medium

Askul Confirms Data Leak After Cyberattack

On November 3, 2025, Japanese retailer Askul confirmed that customer and supplier data was exposed after a ransomware attack earlier in October disrupted its e-commerce operations.

Key points

  • Ransomware attack by RansomHouse group
  • 1.1 terabytes of data stolen
  • Customer and supplier data exposed

Connected intelligence

Signal brief

Follow the organization, likely method and potential impact to explore connected Shadow Tier intelligence.

02

Likely method

Ransomware

Malware, Error activity

03

Potential impact

Data Exposure

Confidentiality, Availability

Published
Nov 3, 2025
Updated
Jun 25, 2026
Confidence
Medium
Evidence
1 source

Structured assessment

Signal analysis

This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.

Threat source

Malware, Error activity

Watch ransomware, endpoint compromise and business interruption exposure.

  • Source type: supplier or third-party involvement

Business impact

Potential operational disruption
Impact area
Confidentiality, Availability
Likely asset
User or customer data

Mentioned entities

AskulData DisclosureCyberattack On NovemberJapaneseAskulThe RansomHouseRansomwareRansomHouseCustomer and

Quick context

Questions about this signal

What happened in this signal?

On November 3, 2025, Japanese retailer Askul confirmed that customer and supplier data was exposed after a ransomware attack earlier in October disrupted its e-commerce operations. The RansomHouse group took credit for the attack, claiming to have stolen 1.1 terabytes of data, including user contact details, inquiry records, and supplier information.

When was this signal reported?

Shadow Tier lists Nov 3, 2025 as the signal date.

Which organization is connected to this signal?

Askul is the organization connected to this public signal.

Explore Askul
Which attack pattern is relevant?

This signal is connected to current ransomware incidents based on its reported incident context.

Explore current ransomware incidents
Which impact area is relevant?

This signal is connected to data exposure and breach intelligence based on its reported consequences.

Explore data exposure and breach intelligence