Skip to content
ThreatCluster

Qilin Ransomware Group Breaches First Brothers Co. Ltd in Japan

First seen 19 Oct 2026, 14:18 UTC • •

Article Content

Browse articles
ThreatCluster AI
ThreatCluster •October 19, 2026 at 15:19 UTC
  • •Qilin ransomware group claims a breach of First Brothers Co. Ltd in Japan.
  • •Compromised data includes sensitive financial and corporate documents.
  • •The breach was announced on October 19, 2026, but verification is pending.

The Qilin ransomware group claims to have breached First Brothers Co. Ltd, exposing sensitive internal data. The compromised information reportedly includes financial reports, forecasts, corporate approval records, confidentiality agreements, electronic signature certificates, and employment contracts. The attack was announced on October 19, 2026, through screenshots shared by the threat actor. The scope of the breach appears significant, affecting corporate documents. As of now, the company has not confirmed the breach, and further verification is pending. The attack method and specific vulnerabilities exploited have not been detailed in the reporting.

Start a free Starter trial for enhanced analysis

Ask AI about this cluster

Updated just now How this analysis works

Timeline

2026-10-19
Qilin ransomware breach announced
The Qilin ransomware group claims to have breached First Brothers Co. Ltd, exposing sensitive internal data.
X

More articles in this cluster (2)

Following this threat?

Track Qilin Ransomware Group and Alma Center in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.

Free account · no card needed

Common questions

What data was compromised?
The breach reportedly exposed financial reports, forecasts, corporate records, and employment contracts.
Has the breach been confirmed?
No, First Brothers Co. Ltd has not confirmed the breach, and verification is still pending.
What should we do if affected?
Monitor for any unusual activity and prepare to secure sensitive data while awaiting further information.