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Koreajoongangdaily • September 7, 2026

A South Korean security firm said the hacking group Kimsuky used an open-source AI coding agent to create documents that concealed malware.

North Korea-linked hacking group Kimsuky was found to have leveraged AI coding agents to create decoys for malicious code, a local security firm said Monday.

Such findings were detected after an analysis of 13 malicious files collected last month, Genians said in its latest cybersecurity threat intelligence report.

According to the report, researchers found that the hacking group distributed emails with attached compressed files containing documents titled "insurance bills" or "policy fund notice." They activated malware when users clicked them, the report said.

The files contained traces of being created by an open-source AI coding agent called opencode.

"In some of the PDF documents, both the 'creator' and 'producer' fields in the metadata were listed as 'opencode,'" the report said.

"These are not values typically generated with standard document creation software, strongly suggesting the documents were generated by an AI agent through programming, rather than created manually."

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Genians said it marks the first time the company has detected signs that Kimsuky is using AI coding agents in its malicious attacks.

Earlier, the company said it detected signs of the hacking group using large language models to create decoys and plan malicious attacks.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Kimsuky Hacking Group Uses AI Coding Agent for Malware Decoys The North Korea-linked hacking group Kimsuky has been confirmed to use an open-source AI coding agent named 'opencode' to create decoy documents for malware distribution. A South Korean security firm, Genians, reported that analysis of 13 malicious files revealed that these documents were disguised as financial and insurance-related materials to lure users into activating malware. The metadata of the decoy files indicated they were generated by the AI agent, with both 'creator' and 'producer' fields showing 'opencode.' This marks the first confirmed use of an AI coding agent by Kimsuky, which had previously been known to utilize large language models for similar purposes. The attack method involved sending emails with compressed files containing these decoy documents, which, when clicked, activated the malware. The findings highlight a significant evolution in Kimsuky's tactics, indicating a shift towards automated attack preparation using AI technology. 6 sources 73

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APT Groups (1)

Attack Types (3)

Companies (1)

Countries (2)

Industries (2)

MITRE ATT&CK (1)

Tools (1)