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Chinese-linked hackers compromise ConnectWise, target hundreds in global attack, Microsoft says

By Thomson Reuters Oct 21, 2026 | 4:20 PM

Oct 21 (Reuters) – A Chinese-linked hacking group used an AI-driven penetration testing tool to compromise IT services firm ConnectWise as part of ​a campaign that targeted hundreds of organizations ‌globally, Microsoft said on Wednesday.

ConnectWise did not immediately respond to a request for comment on Microsoft’s conclusions, although a statement posted to the company’s website on October 16 said ‌it ​was “investigating recent attempts of unauthorized ⁠access associated with the ⁠ConnectWise Cloud Backup environment.”

The Chinese Embassy in Washington did not immediately respond to a request for comment. Beijing regularly denies conducting or condoning ​cyber-enabled data theft.

The hackers, which Microsoft tracks as Storm-0940, used an open-source penetration testing framework called ⁠ARTEX to carry out the ⁠campaign, Microsoft said.

There are multiple tools ​used to conduct penetration testing, a form of legitimate ​testing of the security of networks or ‌services. ARTEX allows users to use any AI model to automate a variety of penetration testing tasks and can be configured to run autonomous tasks ⁠including reconnaissance and data exfiltration, Microsoft said.

The attack targeted organizations across a wide variety of sectors, including aerospace, defense, ⁠automotive, chemicals, ‌energy, financial services, government, legal, manufacturing, ⁠media, military, semiconductor, software, technology, think ​tanks ‌and nonprofits, Microsoft said.

While the majority ​of the ⁠targeting was not successful, Microsoft said, Storm-0940 achieved privileged cloud persistence — or high-level access that could continue even after cleanup efforts — at many organizations in a brief time.

(Reporting by AJ Vicens in Detroit; Editing by ​Edmund Klamann)