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Nikkei Data Breach Exposes 17,000 Slack Accounts

First seen 6 Nov 2025, 17:37 UTC • Bleepingcomputer

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Nikkei, a major Japanese media corporation, reported a data breach affecting over 17,000 employees and business partners. The breach occurred due to malware that compromised an employee's device, allowing attackers to access Slack credentials and chat histories. Nikkei has informed Japan's Personal Information Protection Commission about the incident.

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Attack Flow

12 entities, 14 inferred relationships (STIX 2.1).

Technique (5)

Data Breach
Malware
Phishing
Ransomware
Credential Access

Organization (4)

Nikkei
Nikkei Group Asia
Nikkei Inc.
Salesforce

Affected Platform (2)

Slack
Zoom

Tool (1)

Microsoft Teams

Relationships

Data Breach targets Slack
Data Breach targets Zoom
Malware targets Slack
Malware targets Zoom
Phishing targets Slack
Phishing targets Zoom
Ransomware targets Slack
Ransomware targets Zoom
Credential Access targets Slack
Credential Access targets Zoom
Microsoft Teams related to Nikkei
Microsoft Teams related to Nikkei Group Asia
Microsoft Teams related to Nikkei Inc.
Microsoft Teams related to Salesforce

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Tracked Entities in This Story

Nikkei Nikkei Group Asia Nikkei Inc. Salesforce Slack Zoom

Nikkei Data Breach Exposes 17,000 Slack Accounts

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