The 'analysis-chart' npm package versions listed execute a malicious postinstall script (install-hook.js) that downloads an opaque binary payload from a third-party GitHub release unrelated to the package author. This payload is XOR-decrypted with key 0x42 and injected into the installer's process memory on Windows using native Windows API calls (kernel32.dll, VirtualAlloc, RtlMoveMemory, VirtualProtect, CreateThread). This results in in-memory execution of arbitrary attacker-controlled native code during 'npm install'. Following payload execution, the script writes and runs a cleanup script that deletes the package folder, removes the package entry from package.json, and deletes the install-hook.js script itself to hinder forensic analysis. The package's index.js exports a plausible charting API as a decoy. The author metadata and repository are likely fabricated. Any system with this package installed should be considered fully compromised.

Systems that install any affected version of 'analysis-chart' are subject to arbitrary native code execution on Windows during package installation, leading to full system compromise. Attackers gain control over the developer machine, potentially exposing all stored secrets and credentials. The package attempts to remove evidence of the infection, complicating detection and forensic investigation. Removal of the package alone does not guarantee elimination of the malicious payload or persistence mechanisms.

No official patch or fix is available for this malicious package. Immediate removal of the 'analysis-chart' package from all affected systems is required. Assume full compromise of any system where this package was installed; rotate all secrets and credentials from a secure, uncompromised environment. Conduct thorough forensic analysis and system remediation to ensure no residual malware remains. Avoid installing packages from untrusted or suspicious sources and verify package authenticity before installation.