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AI-Driven Cyber Attacks Target Financial Sector and Cloud Services

AI-Driven Cyber Attacks Target Financial Sector and Cloud Services

First seen 30 Oct 2026, 16:53 UTC • •

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ThreatCluster AI
ThreatCluster •October 30, 2026 at 19:16 UTC
  • •GMO Internet's Onamae cloud service faced unauthorized access, impacting customer data security.
  • •Zscaler identified an AI-assisted attack on South Korean financial institutions, affecting 67,000 records.
  • •Multiple AI-driven threats, including phishing and malware, are exploiting vulnerabilities in cloud services.

On October 27, GMO Internet reported unauthorized access to its Onamae cloud desktop service, with attackers claiming to have stolen sensitive information. The service was suspended on October 21, and the company is assessing the impact, which may affect business continuity and customer data protection. Concurrently, Zscaler ThreatLabz revealed an AI-assisted attack on South Korean financial institutions, exploiting vulnerabilities to access personal data of approximately 67,000 individuals. This attack utilized the ARTEX penetration testing framework for reconnaissance and data exfiltration. Additionally, various AI-driven threats were identified, including phishing schemes impersonating AI brands and malware leveraging AI for evasion tactics. The situation remains fluid, with ongoing investigations into the authenticity of the claims made by attackers.

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Timeline

2026-04-29
CVE-2026-41940 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-09-30
AI-assisted attack on financial institutions
Zscaler ThreatLabz reported an AI-assisted attack targeting South Korean financial institutions, leading to data theft.
Bloglab.360
2026-10-21
Onamae cloud service suspended
GMO Internet suspended the Onamae service following unauthorized access, with ongoing investigations into the breach.
Bloglab.360
2026-10-27
Unauthorized access reported
GMO Internet disclosed unauthorized access to its cloud service, with attackers claiming to have stolen sensitive information.
Bloglab.360

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Common questions

What information was compromised in the Onamae incident?
The attackers claimed to have stolen sensitive information related to the company and its customers, but the authenticity of this data is still under verification.
How many records were affected in the Zscaler report?
The Zscaler report indicated that approximately 67,000 personal records were accessed during the AI-assisted attack.
What should organizations do to protect against these threats?
Organizations should enhance their security measures, monitor for suspicious activity, and ensure robust incident response plans are in place.