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Malicious Claude Code extension on Cursor planted SSH backdoors
A malicious version of Anthropic's Claude Code VS Code extension was distributed through Cursor's extension marketplace for approximately 11 hours on October 29, exposing up to 5,000 developers to malware designed to install persistent SSH backdoors. [...]
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· Microsoft Security Blog US
Inside a malicious Claude Code-branded extension and its persistent SSH backdoor
In this article Attack chain overview Attack chain Host reconnaissance collection SSH authorization and tunnel identities Protocol Tunneling (T1572): reverse SSH forwarding Platform-specific startup persistence Mitigation and protection guidance Immediate actions Remediation actions Follow-up Investigation and recovery Microsoft Defender XDR detections Threat intelligence reports Microsoft Defender XDR Threat analytics Advanced hunting queries MITRE ATT&CK techniques Indicators of compromise …
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· BleepingComputer US nadpis události
Malicious Claude Code extension on Cursor planted SSH backdoors
A malicious version of Anthropic's Claude Code VS Code extension was distributed through Cursor's extension marketplace for approximately 11 hours on October 29, exposing up to 5,000 developers to malware designed to install persistent SSH backdoors. [...]
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· zachyceno · Sophos Threat Research GB
Malicious Claude Code extension distributed through Cursor marketplace
Categories: Threat Research Tags: advisory, Cursor