ConnectWise breach lets China-linked hackers access data at 2,250 firms
Microsoft says China state-aligned hackers breached ConnectWise's cloud backup service and stole application credentials used to link ConnectWise with corporate customers' Microsoft-hosted environments. Using AI agents to automate sign-in attempts at nearly 3,000 per minute, the attackers gained access to roughly 2,250 organizations' emails and files. ConnectWise has paused access to the affected backup system and is investigating while working to restore service.
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The incident shows how AI-driven automation can compress what used to be slow, detectable intrusion campaigns into minutes, leaving defenders little warning, according to Microsoft. It also highlights how a breach at a single IT-management vendor can cascade into exposure for thousands of downstream customers who trusted that vendor's credentials. The same AI tooling was reportedly used in a prior breach of South Korean financial systems, suggesting this approach to mass credential abuse may be spreading among state-linked hacking groups.
- Microsoft attributes the breach to China state-aligned hackers who stole ConnectWise cloud-backup credentials.
- AI agents reportedly enabled sign-in attempts at nearly 3,000 per minute across about 2,250 organizations.
- ConnectWise has suspended the affected cloud backup service and is investigating while restoring access.
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Published there as: “Chinese hackers spied on thousands of companies after breaching IT giant ConnectWise”
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