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6/23/2026
npm Supply Chain RAT: PostCSS Impersonation & Dependency Confusion

npm Supply Chain RAT: PostCSS Impersonation & Dependency Confusion

Short summary

Three malicious npm packages impersonating PostCSS tools delivered Windows RAT payloads to developers in June 2026, exploiting npm's design that allows arbitrary code execution during package installation. The attack demonstrates why automated dependency management without behavioral validation is a critical vulnerability. Detection requires process monitoring, egress filtering, and pre-installation package manifest analysis.

  • •npm packages with PostCSS-like names delivered Windows RAT via install scripts
  • •Attack exploited legitimate naming and npm's inherent design allowing arbitrary code execution
  • •Detection requires behavioral analysis and process monitoring, not just hash validation

Generated with AI, which can make mistakes.

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