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flag Chinese hackers exploited a Microsoft SharePoint flaw to breach global organizations, using multiple malware types and techniques.

flag Chinese state-linked hackers exploited the unpatched Microsoft SharePoint vulnerability CVE-2025-53770, also known as ToolShell, to breach government agencies, telecom providers, universities, and financial institutions across North America, South America, Africa, and the Middle East. flag The flaw, patched in July 2025, allowed remote code execution and was used as a zero-day before remediation. flag Attackers deployed malware including Zingdoor, ShadowPad, and KrustyLoader, used DLL sideloading with legitimate tools, and leveraged living-off-the-land techniques to evade detection. flag Multiple Chinese cyber groups, including Salt Typhoon, Linen Typhoon, and Violet Typhoon, were involved in a coordinated campaign, with evidence of collaboration and shared tools. flag The U.S. CISA added the vulnerability to its Known Exploited Vulnerabilities catalog, urging urgent patching to mitigate ongoing risks.

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