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Storm-2603 Hackers Exploit SharePoint ToolShell Flaws to Hide Fileless Backdoor and Launch Ransomware Attack
A China-linked threat group tracked as Storm-2603 has used the SharePoint ToolShell flaws to plant a backdoor that never touches the disk. The group then tried to run Warlock ransomware on the same network. The break-in hit an on-premises SharePoint server and ended with a ransomware launch that security software blocked. ToolShell is the name […] The post Storm-2603 Hackers Exploit SharePoint ToolShell Flaws to Hide Fileless Backdoor and Launch Ransomware Attack appeared first on Cyber Security News.
A China-linked threat group tracked as Storm-2603 has used the SharePoint ToolShell flaws to plant a backdoor that never touches the disk. The group then tried to run Warlock ransomware on the same network. The break-in hit an on-premises SharePoint server and ended with a ransomware launch that security software blocked. ToolShell is the name for a set of Microsoft SharePoint bugs, including CVE-2025-53770 and CVE-2025-53771. They let an attacker run code on a server through specially crafted web requests. Microsoft…
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