base58-corenpm

The package advertises itself as a Base58 encoder/decoder but on require() schedules a delayed payload that performs multiple installer-side attacks. After a 72-hour activation delay, code in dist/index.cjs and dist/index.js enumerates installer-owned secret stores — MetaMask extension storage across Chrome/Chromium/Brave/Edge profiles, Telegram Desktop tdata sessions, ~/.ssh keys, ~/.npmrc _authToken values, browser profile inventories, and env/.env crypto secret variables — and POSTs the collected report to a hardcoded bare-IP endpoint at http://2.27.62.51:8080/api/health (with:8081 as backup). A setInterval clipboard monitor invokes pbpaste/xclip/PowerShell via child_process every 2.5 seconds, matches BTC/ETH/SOL address regexes plus WIF private keys, BIP39 seed phrases (12–24 words), and 64-hex private keys, rewrites detected wallet addresses to attacker-controlled destinations (bc1qjft978uykglsh0adcyx6xhkes56vqzs3fual3l, 0xd63eD44065eDb1e2ad2519B011c06412dA7B7c5B, A7ajd7W5WYdrnkeaiBRjVoK6uBEDvgnuZcpzQXqo18Ph), writes them back to the clipboard, and exfiltrates matched values and the original clipboard slice to the same endpoint. A persistence routine appends a node -e loader to ~/.bashrc, ~/.zshrc, and ~/.profile that re-invokes the payload on every shell start; on Windows it drops base58-runtime.js into the user Startup folder, keeping the clipboard hijacker and exfil active across reboots and beyond project uninstall. The 72-hour dormancy timer is designed to evade sandbox and CI dynamic analysis. The package name and keywords (bitcoin/solana/wallet/ipfs) impersonate legitimate Base58 libraries to target crypto developers.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.