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IncidentMediaFrontierJapan South Korea ChinaConfirmed

GMO confirms the AI penetration-testing tool ARTEX behind attacks on Japanese companies

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Source: GMO Cybersecurity by IeraeAlso reported by Taipei Times (AFP)

GMO Cybersecurity by Ierae said on 19 October 2026 that the attack infrastructure behind recent breaches of Japanese companies ran ARTEX, an autonomous AI penetration-testing system. The host it examined targeted about 20 Japanese companies, nine of them in one industry. A wider search found six more AI-driven attack hosts aimed at Japanese companies in digital gifts, retail, education, printing, marketing, insurance, finance, e-commerce, media and logistics. Eight of the companies GMO saw targeted had already announced data leaks in September or October, and GMO has passed its findings to law enforcement. CrowdStrike had earlier tied ARTEX to a campaign against South Korean financial institutions that began in late September; AFP reported that the tool’s Chinese developer closed access to its source code this month.

Why it matters

One AI tool is now confirmed in breaches in Japan and South Korea, run as separate campaigns with a host for each country and industry.

When
19 Oct 2026
ID
WTA-N-2026-0344
Who
GMO Cybersecurity by Ierae, GMO Internet Group, CrowdStrike; Daiki Fukumori
System
ARTEX (autonomous AI penetration-testing tool)
Operator
unidentified attack group
Type
data breaches at Japanese companies (about 20 targeted by one host; eight had disclosed leaks)
Status
shared with law enforcement; investigation continues; disclosed by GMO Cybersecurity by Ierae · Incident ledger

Summary by wheresthe.ai, from GMO Cybersecurity by Ierae and the reporting credited above. Checked against the source on 20 Oct 2026.

Read the original at GMO Cybersecurity by Ierae

Source copy: download the page as saved on 20 Oct 2026 (PDF). Also held by the Internet Archive.

Next stop on this Storyline: Elsewhere: InternationalNVIDIA launches the OpenShell reference architecture to contain, monitor and police enterprise AI agents in hardware

Cite this story

WTA-N-2026-0344: “GMO confirms the AI penetration-testing tool ARTEX behind attacks on Japanese companies.” wheresthe.ai, 19 Oct 2026. https://wheresthe.ai/d/jp-china-made-ai-tool-artex-used-in-cyberattacks-on-japanese-2026-10/ (source: GMO Cybersecurity by Ierae).

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